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Mandal S, Kumar M, Sengupta P, Panigrahi A, Debata M, Shamili C, Surendran KP, Manna I, Basu S. Laser Melting of Mechanically Alloyed FeNi: A Study of the Correlation between Microstructure and Texture with Magnetic and Physical Properties. ACS OMEGA 2024; 9:15650-15662. [PMID: 38585114 PMCID: PMC10993361 DOI: 10.1021/acsomega.4c00601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Revised: 03/04/2024] [Accepted: 03/06/2024] [Indexed: 04/09/2024]
Abstract
The current study attempts to establish the interrelation between microstructure and magnetic properties induced during laser melting of the FeNi alloy. This study demonstrates the optimization of laser parameters for defect-free, uniform, and chemically homogeneous FeNi alloy synthesis. Mechanically alloyed FeNi (50-50 atom %) powders obtained after 12 and 24 h milling, with average particle sizes of 15 and 7 μm, were used as starting materials. It was found that the optimum range of laser power density for synthesis of dense and defect-free solids is between 1 and 1.4 J/mm2. For laser melting under similar conditions, 12 h milled FeNi powder produces a larger grain (∼100 μm) with a preferred texture of (001), compared to 25 μm grain size in 24 h milled FeNi, with random texture. Smaller grain size is correlated with higher resistance to domain wall movement, resulting in higher coercivity and remanence in the laser-melted samples prepared from 24 h of milled powder. The presence of microtexture in laser-melted samples prepared from 12 h milled powder is related to a higher anisotropy.
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Affiliation(s)
- Shuvam Mandal
- CSIR—Institute
of Minerals and Materials Technology, Bhubaneswar 751013, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Manoj Kumar
- CSIR—Institute
of Minerals and Materials Technology, Bhubaneswar 751013, India
- Department
of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - Pradyut Sengupta
- CSIR—Institute
of Minerals and Materials Technology, Bhubaneswar 751013, India
- Department
of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - Ajit Panigrahi
- CSIR—Institute
of Minerals and Materials Technology, Bhubaneswar 751013, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Mayadhar Debata
- CSIR—Institute
of Minerals and Materials Technology, Bhubaneswar 751013, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Chandradas Shamili
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
- Material
Science and Technology Division, CSIR—Institute
of Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram 695019, India
| | - Kuzhichalil Peethambharan Surendran
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
- Material
Science and Technology Division, CSIR—Institute
of Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram 695019, India
| | - Indranil Manna
- Department
of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
- Birla
Institute of Technology (BIT), Mesra, Ranchi 835215, India
| | - Suddhasatwa Basu
- CSIR—Institute
of Minerals and Materials Technology, Bhubaneswar 751013, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
- Department
of Chemical Engineering, Indian Institute
of Technology Delhi, New Delhi 110016, India
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2
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Podmiljšak B, Saje B, Jenuš P, Tomše T, Kobe S, Žužek K, Šturm S. The Future of Permanent-Magnet-Based Electric Motors: How Will Rare Earths Affect Electrification? MATERIALS (BASEL, SWITZERLAND) 2024; 17:848. [PMID: 38399099 PMCID: PMC10890235 DOI: 10.3390/ma17040848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Revised: 01/30/2024] [Accepted: 02/03/2024] [Indexed: 02/25/2024]
Abstract
In this review article, we focus on the relationship between permanent magnets and the electric motor, as this relationship has not been covered in a review paper before. With the increasing focus on battery research, other parts of the electric system have been neglected. To make electrification a smooth transition, as has been promised by governing bodies, we need to understand and improve the electric motor and its main component, the magnet. Today's review papers cover only the engineering perspective of the electric motor or the material-science perspective of the magnetic material, but not both together, which is a crucial part of understanding the needs of electric-motor design and the possibilities that a magnet can give them. We review the road that leads to today's state-of-the-art in electric motors and magnet design and give possible future roads to tackle the obstacles ahead and reach the goals of a fully electric transportation system. With new technologies now available, like additive manufacturing and artificial intelligence, electric motor designers have not yet exploited the possibilities the new freedom of design brings. New out-of-the-box designs will have to emerge to realize the full potential of the new technology. We also focus on the rare-earth crisis and how future price fluctuations can be avoided. Recycling plays a huge role in this, and developing a self-sustained circular economy will be critical, but the road to it is still very steep, as ongoing projects show.
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Affiliation(s)
- Benjamin Podmiljšak
- Department for Nanostructural Materials, Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia; (B.S.); (P.J.); (T.T.); (S.K.); (K.Ž.); (S.Š.)
| | - Boris Saje
- Department for Nanostructural Materials, Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia; (B.S.); (P.J.); (T.T.); (S.K.); (K.Ž.); (S.Š.)
- Kolektor d.o.o., Vojkova ulica 10, 5280 Idrija, Slovenia
| | - Petra Jenuš
- Department for Nanostructural Materials, Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia; (B.S.); (P.J.); (T.T.); (S.K.); (K.Ž.); (S.Š.)
| | - Tomaž Tomše
- Department for Nanostructural Materials, Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia; (B.S.); (P.J.); (T.T.); (S.K.); (K.Ž.); (S.Š.)
| | - Spomenka Kobe
- Department for Nanostructural Materials, Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia; (B.S.); (P.J.); (T.T.); (S.K.); (K.Ž.); (S.Š.)
| | - Kristina Žužek
- Department for Nanostructural Materials, Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia; (B.S.); (P.J.); (T.T.); (S.K.); (K.Ž.); (S.Š.)
| | - Sašo Šturm
- Department for Nanostructural Materials, Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia; (B.S.); (P.J.); (T.T.); (S.K.); (K.Ž.); (S.Š.)
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3
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Lewis LH, Stamenov PS. Accelerating Nature: Induced Atomic Order in Equiatomic FeNi. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2302696. [PMID: 38072671 PMCID: PMC10870030 DOI: 10.1002/advs.202302696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 09/27/2023] [Indexed: 02/17/2024]
Abstract
The production of locally atomically ordered FeNi (known by its meteoric mineral name, tetrataenite) is confirmed in bulk samples by simultaneous conversion X-ray and backscattered γ-ray 57 Fe Mössbauer spectroscopy. Up to 22 volume percent of the tetragonal tetrataenite phase is quantified in samples thermally treated under simultaneous magnetic- and stress-field conditions for a period of 6 weeks, with the remainder identified as the cubic FeNi alloy. In contrast, all precursor samples consist only of the cubic FeNi alloy. Data from the processed alloys are validated using Mössbauer parameters derived from natural meteoritic tetrataenite. The meteoritic tetrataenite exhibits a substantially higher degree of atomic order than do the processed samples, consistent with their low uniaxial magnetocrystalline anisotropy energy of ≈1 kJ·m-3 . These results suggest that targeted refinements to the processing conditions of FeNi will foster greater atomic order and increased magnetocrystalline anisotropy, leading to an enhanced magnetic energy product. These outcomes also suggest that deductions concerning paleomagnetic conditions of the solar system, as derived from meteoritic data, may warrant re-examination and re-evaluation. Additionally, this work strengthens the argument that tetrataenite may indeed become a member of the advanced permanent magnet portfolio, helping to meet rapidly escalating green energy imperatives.
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Affiliation(s)
- Laura H. Lewis
- Department of Chemical Engineering and Department of Mechanical and Industrial EngineeringNortheastern UniversityBostonMA02115USA
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4
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Chrobak A. High and Ultra-High Coercive Materials in Spring-Exchange Systems-Review, Simulations and Perspective. MATERIALS (BASEL, SWITZERLAND) 2022; 15:6506. [PMID: 36233859 PMCID: PMC9573313 DOI: 10.3390/ma15196506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 08/11/2022] [Accepted: 09/16/2022] [Indexed: 06/16/2023]
Abstract
The paper refers to the spring-exchange magnetic systems containing magnetically soft and hard phases. This work consists of two parts. The first part is a brief review of hard magnetic materials, with special attention paid to ultra-high coercive compounds, as well as selected spring-exchange systems. The second part is a theoretical discussion based on the Monte Carlo micromagnetic simulations about the possible enhancement of the hard magnetic properties of systems composed of magnetically soft, as well as high and ultra-high coercive, phases. As shown, the analyzed systems reveal the potential for improving the |BH|max parameter, filling the gap between conventional and Nd-based permanent magnets. Moreover, the carried-out simulations indicate the advantages and limitations of the spring-exchange composites, which could lead to a reduction in rare earth elements in permanent magnet applications.
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Affiliation(s)
- Artur Chrobak
- Institute of Physics, University of Silesia in Katowice, 75-Pułku Piechoty 1A, 41-500 Chorzów, Poland
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5
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Islam R, Borah JP. Large magnetic anisotropy in Co-Fe-Ni-N ordered structures: a first-principles study. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 34:095503. [PMID: 34918625 DOI: 10.1088/1361-648x/ac3f03] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Accepted: 12/01/2021] [Indexed: 06/14/2023]
Abstract
Material design of promising rare-earth free permanent magnet requires tailoring and controlling the intrinsic magnetic properties namely large saturation magnetizationμ0Ms, giant uniaxial magnetic anisotropyKu, and high Curie temperatureTC. Based on first-principles electronic structure calculations, we present a detailed analysis for the intrinsic magnetic properties of CoxFe1-xNi and CoxFe1-xNiN0.25ordered structures. We predict an enhanced structural stability with improvedKuranging from 1.53-2.29 MJ m-3for CoxFe1-xNiN0.25ordered structures, with the exception of CoNiN0.25having planar anisotropy. Detailed analysis of the predicted largeKu, based on perturbation theory and electronic structure calculations, is attributed to the cumulative effect of contribution from the increased tetragonal distortion and induced orbital distortion from the simultaneous Co substitution and interstitial N-doping. By tailoring theKu, we may create efficient and affordable PMs, bridging the gap between commonly used ferrite and high-performance Nd-Fe-B magnets.
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Affiliation(s)
- Riyajul Islam
- Department of Physics, National Institute of Technology Nagaland, Dimapur, Nagaland-797103, India
| | - J P Borah
- Department of Physics, National Institute of Technology Nagaland, Dimapur, Nagaland-797103, India
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6
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Shankhari P, Janka O, Pöttgen R, Fokwa BPT. Rare-Earth-Free Magnets: Enhancing Magnetic Anisotropy and Spin Exchange Toward High- TC Hf 2MIr 5B 2 ( M = Mn, Fe). J Am Chem Soc 2021; 143:4205-4212. [PMID: 33715365 DOI: 10.1021/jacs.0c10778] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Designing new rare-earth-free (REF) permanent magnetic materials (PMM) to replace the high performing but critically restrained rare-earth-based PMM remains a great challenge to the scientific community. Here, we report on the rational design of new REF PMM, Hf2MIr5B2 (M = Fe, Mn) via a theory-experiment combined approach. Density functional theory (DFT) predicted strong interchain M-M spin-exchange coupling and large magnetocrystalline anisotropy energies (EMAE) for the new compounds, suggesting potential intrinsic PMM properties. Subsequent experimental bulk syntheses and magnetic characterizations established the highest ordering temperature (TC ∼ 900 K) for Hf2FeIr5B2 and the highest intrinsic coercivity (HC) value for Hf2MnIr5B2 (HC = 62.1 kA/m) reported to date for Ti3Co5B2-type compounds. Importantly, at room temperature both phases show significant coercivities due to intrinsic factors only, hinting at their huge potential to create REF PMM by improving extrinsic factors such as controlling the microstructure and the domain orientation.
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Affiliation(s)
- Pritam Shankhari
- Department of Chemistry, University of California, Riverside, California 92521, United States
| | - Oliver Janka
- Anorganische Festkörperchemie, Universität des Saarlandes, Campus C 4 1, D-66123 Saarbrücken, Germany.,Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstrasse 30, D-48149 Münster, Germany
| | - Rainer Pöttgen
- Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstrasse 30, D-48149 Münster, Germany
| | - Boniface P T Fokwa
- Department of Chemistry, University of California, Riverside, California 92521, United States.,Department of Chemical and Environmental Engineering, University of California, Riverside, California 92521, United States
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7
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Alloying effect on the order-disorder transformation in tetragonal FeNi. Sci Rep 2021; 11:5253. [PMID: 33664353 PMCID: PMC7933153 DOI: 10.1038/s41598-021-84482-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Accepted: 02/15/2021] [Indexed: 11/08/2022] Open
Abstract
Tetragonal ([Formula: see text]) FeNi is a promising material for high-performance rare-earth-free permanent magnets. Pure tetragonal FeNi is very difficult to synthesize due to its low chemical order-disorder transition temperature ([Formula: see text] K), and thus one must consider alternative non-equilibrium processing routes and alloy design strategies that make the formation of tetragonal FeNi feasible. In this paper, we investigate by density functional theory as implemented in the exact muffin-tin orbitals method whether alloying FeNi with a suitable element can have a positive impact on the phase formation and ordering properties while largely maintaining its attractive intrinsic magnetic properties. We find that small amount of non-magnetic (Al and Ti) or magnetic (Cr and Co) elements increase the order-disorder transition temperature. Adding Mo to the Co-doped system further enhances the ordering temperature while the Curie temperature is decreased only by a few degrees. Our results show that alloying is a viable route to stabilizing the ordered tetragonal phase of FeNi.
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8
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Singh P, Das D, Johnson DD, Arroyave R, Alam A. Effect of Pd alloying on structural, electronic and magnetic properties of L1 0Fe-Ni. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:154003. [PMID: 33296872 DOI: 10.1088/1361-648x/abd1fb] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Accepted: 12/09/2020] [Indexed: 06/12/2023]
Abstract
We present a systematic study of the effect of Pd-alloying on phase stability, electronic structure, and elastic properties in L10Fe-Ni using density-functional theory. Being from the same group of the periodic table, Pd is the best candidate for chemical alloying. The Fe-Ni/Fe-Pd/Ni-Pd bond-length increases with increasing Pd-concentration, which weakens the hybridization between low lying energy states below Fermi-level. The reduced hybridization decreases the relative thermodynamic stability of L10Fe(Ni1-xPdx) untilx= 0.75. Beyond this concentration, the relative stability gets enhanced, which is attributed to a unique change in the lattice distortion (c/a). The elastic properties show a non-monotonous behavior as a function ofx, which is again due to a specific change-over in the uniaxial strain. We found that Pd alloying increases the local Fe moment and structural anisotropy of L10FeNi, which are important for applications such as microwave absorption, refrigeration systems, recording devices, imaging and sensors. We believe that the present study for the chemical alloying effect can provide critical insights toward the understanding of electronic-structure and elastic behavior of other technologically important materials.
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Affiliation(s)
- Prashant Singh
- Ames Laboratory, U.S. Department of Energy, Ames, IA 50011, United States of America
| | - Debashish Das
- Department of Physics, Indian Institute of Technology, Bombay, Powai, Mumbai 400076, India
| | - Duane D Johnson
- Ames Laboratory, U.S. Department of Energy, Ames, IA 50011, United States of America
- Materials Science & Engineering, Iowa State University, Ames, Iowa 50011, United States of America
| | - Raymundo Arroyave
- Dept. of Materials Science & Engineering, Texas A&M University, College Station, TX 77843, United States of America
| | - Aftab Alam
- Department of Physics, Indian Institute of Technology, Bombay, Powai, Mumbai 400076, India
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9
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Pressure effect on the order-disorder transformation in L1 0 FeNi. Sci Rep 2020; 10:14766. [PMID: 32901047 PMCID: PMC7478971 DOI: 10.1038/s41598-020-71551-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Accepted: 06/10/2020] [Indexed: 11/09/2022] Open
Abstract
The ordered phase of the FeNi system is known for its promising magnetic properties that make it a first-class rare-earth free permanent magnet. Mapping out the parameter space controlling the order-disorder transformation is an important step towards finding growth conditions that stabilize the [Formula: see text] phase of FeNi. In this work, we study the magnetic properties and chemical order-disorder transformation in FeNi as a function of lattice expansion by utilizing ab initio alloy theory. The largest volume expansion considered here is 29% which corresponds to a pressure of [Formula: see text] GPa. The thermodynamic and magnetic calculations are formulated in terms of a long-range order parameter, which is subsequently used to find the ordering temperature as a function of pressure. We show that negative pressure promotes ordering, meaning that synthetic routes involving an increase of the volume of FeNi are expected to expand the stability field of the [Formula: see text] phase.
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Kurichenko VL, Karpenkov DY, Gostischev PA. Micromagnetic modelling of nanorods array-based L1 0-FeNi/SmCo 5exchange-coupled composites. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:405806. [PMID: 32575095 DOI: 10.1088/1361-648x/ab9f52] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Accepted: 06/23/2020] [Indexed: 06/11/2023]
Abstract
Exchange-coupled nanocomposites are considered as the most promising materials for production of high-energy performance permanent magnets, which can exceed neodymium ones in terms of energy product. In this work, micromagnetic simulations of L10-FeNi/SmCo5composites based on the initially anisotropic structure of nanorods array were performed. Texturing effect on magnetic properties was investigated. It was revealed that even 30% of anisotropy axes misalignment of grains in L10-FeNi phase would lead to only ≈10% drop of coercivity. To maximize magnetic properties of the composites, parameters of microstructure were optimized for 120 × 120 array of interacting nanorods and were found to be 40 nm nanorod diameter and 12-20 nm interrod distance. The estimated diameter of nanorods and the packing density of the array provide energy product values of 149 kJ m-3. Influence of interrod distance on energy product values was explored. Approaches for production of exchange-coupled composites based on anisotropic nanostructures were proposed.
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Affiliation(s)
- V L Kurichenko
- National University of Science and Technology 'MISIS', Leninskiy prospect, 4, Moscow, 119991, Russia
| | - D Yu Karpenkov
- National University of Science and Technology 'MISIS', Leninskiy prospect, 4, Moscow, 119991, Russia
| | - P A Gostischev
- L.A.S.E.-Laboratory for Advanced Solar Energy, National University of Science and Technology 'MISIS', Leninskiy prospect 6, Moscow, 119049, Russia
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11
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Flores-Livas JA. Crystal structure prediction of magnetic materials. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:294002. [PMID: 32155593 DOI: 10.1088/1361-648x/ab7e54] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We present a methodology to predict magnetic systems using ab initio methods. By employing crystal structure method and spin-polarized calculations, we explore the relation between crystalline structures and their magnetic properties. In this work, testbed cases of transition metal alloys (FeCr, FeMn, FeCo and FeNi) are study in the ferromagnetic case. We find soft-magnetic properties for FeCr, FeMn while for FeCo and FeNi hard-magnetic are predicted. In particular, for the family of FeNi, a candidate structure with energy lower than the tetrataenite was found. The structure has a saturation magnetization (M s) of 1.2 MA m-1, magnetic anisotropy energy (MAE) above 1200 kJ m-3 and hardness value close to 1. Theoretically, this system made of abundant elements could be the right candidate for permanent magnet applications. Comparing with the state-of-the-art (Nd2Fe14B) hard-magnet, (M s of 1.28 MA m-1 and MAE of 4900 kJ m-3) is appealing to explore this low energy polymorph of FeNi further. Considering the relatively limited number of magnets, predicting a new system may open routes for free rare-earth magnets. Furthermore, the use of the computational algorithm as the one presented in this work, hold promises in this field for which in near future improvements will allow to study numerous complex systems, larger simulations cells and tackled long-range antiferromagnetic cases.
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Affiliation(s)
- José A Flores-Livas
- Dipartimento di Fisica, Università di Roma La Sapienza, Piazzale Aldo Moro 5, I-00185 Roma, Italy
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12
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Belozerov AS, Katanin AA, Anisimov VI. Electronic correlation effects and local magnetic moments in L1 0phase of FeNi. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:385601. [PMID: 32608359 DOI: 10.1088/1361-648x/ab9566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Accepted: 05/21/2020] [Indexed: 06/11/2023]
Abstract
We study the electronic and magnetic properties of L10phase of FeNi, a perspective rare-earth-free permanent magnet, by using a combination of density functional and dynamical mean-field theory. Although L10FeNi has a slightly tetragonally distorted fcc lattice, we find that magnetic properties of its constituent Fe atoms resemble those in pure bcc Fe. In particular, our results indicate the presence of well-localized magnetic moments on Fe sites, which are formed due to Hund's exchange. At the same time, magnetism of Ni sites is much more itinerant. Similarly to pure bcc Fe, the self-energy of Fe 3d states is found to show the non-Fermi-liquid behavior. This can be explained by peculiarities of density of Fe 3d states, which has pronounced peaks near the Fermi level. Our study of local spin correlation function and momentum dependence of particle-hole bubble suggests that the magnetic exchange in this substance is expected to be of RKKY-type, with iron states providing local-moment contribution, and the states corresponding to nickel sites (including virtual hopping to iron sites) providing itinerant contribution.
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Affiliation(s)
- A S Belozerov
- M. N. Miheev Institute of Metal Physics, Russian Academy of Sciences, 620108 Yekaterinburg, Russia
| | - A A Katanin
- M. N. Miheev Institute of Metal Physics, Russian Academy of Sciences, 620108 Yekaterinburg, Russia
- Moscow Institute of Physics and Technology, 141701 Dolgoprudny, Russia
| | - V I Anisimov
- M. N. Miheev Institute of Metal Physics, Russian Academy of Sciences, 620108 Yekaterinburg, Russia
- Skolkovo Institute of Science and Technology, 121205 Moscow, Russia
- Ural Federal University, 620002 Yekaterinburg, Russia
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13
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Density Functional Theory description of the order-disorder transformation in Fe-Ni. Sci Rep 2019; 9:8172. [PMID: 31160612 PMCID: PMC6546697 DOI: 10.1038/s41598-019-44506-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2018] [Accepted: 05/14/2019] [Indexed: 11/18/2022] Open
Abstract
The thermodynamic ordering transformation of tetragonal FeNi system is investigated by the Exact Muffin-Tin Orbitals (EMTO) method. The tetragonal distortion of the unit cell is taken into account and the free energy is calculated as a function of long-range order and includes the configurational, vibrational, electronic and magnetic contributions. We find that both configurational and vibrational effects are important and that the vibrational effect lowers the predicted transformation temperature by about 480 K compared to the value obtained merely from the configurational free energy. The predicted temperature is in excellent agreement with the experimental value when all contributions are taken into account. We also perform spin dynamics calculations for the magnetic transition temperature and find it to be in agreement with the experiments. The present research opens new opportunities for quantum-mechanical engineering of the chemical and magnetic ordering in tetrataenite.
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14
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Giannopoulos G, Barucca G, Kaidatzis A, Psycharis V, Salikhov R, Farle M, Koutsouflakis E, Niarchos D, Mehta A, Scuderi M, Nicotra G, Spinella C, Laureti S, Varvaro G. L1 0-FeNi films on Au-Cu-Ni buffer-layer: a high-throughput combinatorial study. Sci Rep 2018; 8:15919. [PMID: 30374113 PMCID: PMC6206008 DOI: 10.1038/s41598-018-34296-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Accepted: 10/12/2018] [Indexed: 11/25/2022] Open
Abstract
The fct L10-FeNi alloy is a promising candidate for the development of high performance critical-elements-free magnetic materials. Among the different materials, the Au-Cu-Ni alloy has resulted very promising; however, a detailed investigation of the effect of the buffer-layer composition on the formation of the hard FeNi phase is still missing. To accelerate the search of the best Au-Cu-Ni composition, a combinatorial approach based on High-Throughput (HT) experimental methods has been exploited in this paper. HT magnetic characterization methods revealed the presence of a hard magnetic phase with an out-of-plane easy-axis, whose coercivity increases from 0.49 kOe up to 1.30 kOe as the Au content of the Cu-Au-Ni buffer-layer decreases. Similarly, the out-of-plane magneto-crystalline anisotropy energy density increases from 0.12 to 0.35 MJ/m3. This anisotropy is attributed to the partial formation of the L10 FeNi phase induced by the buffer-layer. In the range of compositions we investigated, the buffer-layer structure does not change significantly and the modulation of the magnetic properties with the Au content in the combinatorial layer is mainly related to the different nature and extent of interlayer diffusion processes, which have a great impact on the formation and order degree of the L10 FeNi phase.
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Affiliation(s)
- G Giannopoulos
- Institute of Nanoscience and Nanotechnology, NCSR Demokritos, Athens, Greece.
| | - G Barucca
- Università Politecnica delle Marche, Dipartimento SIMAU, Via Brecce Bianche 12, Ancona, 60131, Italy.
| | - A Kaidatzis
- Institute of Nanoscience and Nanotechnology, NCSR Demokritos, Athens, Greece
| | - V Psycharis
- Institute of Nanoscience and Nanotechnology, NCSR Demokritos, Athens, Greece
| | - R Salikhov
- Faculty of Physics and Center for Nanointegration (CENIDE), University of Duisburg-Essen, 47057, Duisburg, Germany
- Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of RAS, 420029, Kazan, Russian Federation
| | - M Farle
- Faculty of Physics and Center for Nanointegration (CENIDE), University of Duisburg-Essen, 47057, Duisburg, Germany
- Center for Functionalized Magnetic Materials (FunMagMa), Immanuel Kant Baltic Federal University, Kaliningrad, Russian Federation
| | - E Koutsouflakis
- Institute of Nanoscience and Nanotechnology, NCSR Demokritos, Athens, Greece
| | - D Niarchos
- Institute of Nanoscience and Nanotechnology, NCSR Demokritos, Athens, Greece
| | - A Mehta
- SLAC National Accelerator Laboratory- Stanford University, Menlo Park, California, USA
| | - M Scuderi
- IMM-CNR, VII strada 5, 95121, Catania, Italy
| | - G Nicotra
- IMM-CNR, VII strada 5, 95121, Catania, Italy
| | - C Spinella
- IMM-CNR, VII strada 5, 95121, Catania, Italy
| | - S Laureti
- Istituto di Struttura della Materia, CNR, Monterotondo Scalo, Roma, Italy
| | - G Varvaro
- Istituto di Struttura della Materia, CNR, Monterotondo Scalo, Roma, Italy
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15
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Goto S, Kura H, Watanabe E, Hayashi Y, Yanagihara H, Shimada Y, Mizuguchi M, Takanashi K, Kita E. Synthesis of single-phase L1 0-FeNi magnet powder by nitrogen insertion and topotactic extraction. Sci Rep 2017; 7:13216. [PMID: 29038579 PMCID: PMC5643398 DOI: 10.1038/s41598-017-13562-2] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Accepted: 09/25/2017] [Indexed: 11/23/2022] Open
Abstract
Tetrataenite (L10-FeNi) is a promising candidate for use as a permanent magnet free of rare-earth elements because of its favorable properties. In this study, single-phase L10-FeNi powder with a high degree of order was synthesized through a new method, nitrogen insertion and topotactic extraction (NITE). In the method, FeNiN, which has the same ordered arrangement as L10-FeNi, is formed by nitriding A1-FeNi powder with ammonia gas. Subsequently, FeNiN is denitrided by topotactic reaction to derive single-phase L10-FeNi with an order parameter of 0.71. The transformation of disordered-phase FeNi into the L10 phase increased the coercive force from 14.5 kA/m to 142 kA/m. The proposed method not only significantly accelerates the development of magnets using L10-FeNi but also offers a new synthesis route to obtain ordered alloys in non-equilibrium states.
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Affiliation(s)
- Sho Goto
- Advanced Research and Innovation Center, DENSO Corporation, Aichi, 470-0111, Japan.
| | - Hiroaki Kura
- Advanced Research and Innovation Center, DENSO Corporation, Aichi, 470-0111, Japan
| | - Eiji Watanabe
- Advanced Research and Innovation Center, DENSO Corporation, Aichi, 470-0111, Japan
| | - Yasushi Hayashi
- Advanced Research and Innovation Center, DENSO Corporation, Aichi, 470-0111, Japan
| | - Hideto Yanagihara
- Institute of Applied Physics, University of Tsukuba, Ibaraki, 305-8573, Japan
| | - Yusuke Shimada
- Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan
| | - Masaki Mizuguchi
- Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan
| | - Koki Takanashi
- Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan
| | - Eiji Kita
- Institute of Applied Physics, University of Tsukuba, Ibaraki, 305-8573, Japan.,National Institute of Technology, Ibaraki College, Ibaraki, 312-8508, Japan
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16
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High coercivity, anisotropic, heavy rare earth-free Nd-Fe-B by Flash Spark Plasma Sintering. Sci Rep 2017; 7:11134. [PMID: 28894237 PMCID: PMC5593872 DOI: 10.1038/s41598-017-11660-9] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2017] [Accepted: 08/17/2017] [Indexed: 11/08/2022] Open
Abstract
ABSTARCT In the drive to reduce the critical Heavy Rare Earth (HRE) content of magnets for green technologies, HRE-free Nd-Fe-B has become an attractive option. HRE is added to Nd-Fe-B to enhance the high temperature performance of the magnets. To produce similar high temperature properties without HRE, a crystallographically textured nanoscale grain structure is ideal; and this conventionally requires expensive "die upset" processing routes. Here, a Flash Spark Plasma Sintering (FSPS) process has been applied to a Dy-free Nd30.0Fe61.8Co5.8Ga0.6Al0.1B0.9 melt spun powder (MQU-F, neo Magnequench). Rapid sinter-forging of a green compact to near theoretical density was achieved during the 10 s process, and therefore represents a quick and efficient means of producing die-upset Nd-Fe-B material. The microstructure of the FSPS samples was investigated by SEM and TEM imaging, and the observations were used to guide the optimisation of the process. The most optimal sample is compared directly to commercially die-upset forged (MQIII-F) material made from the same MQU-F powder. It is shown that the grain size of the FSPS material is halved in comparison to the MQIII-F material, leading to a 14% increase in coercivity (1438 kA m-1) and matched remanence (1.16 T) giving a BHmax of 230 kJ m-3.
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17
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Frisk A, Lindgren B, Pappas SD, Johansson E, Andersson G. Resonant x-ray diffraction revealing chemical disorder in sputtered L10 FeNi on Si(0 0 1). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:406002. [PMID: 27518923 DOI: 10.1088/0953-8984/28/40/406002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In the search for new rare earth free permanent magnetic materials, FeNi with a L10 structure is a possible candidate. We have synthesized the phase in the thin film form by sputtering onto HF-etched Si(0 0 1) substrates. Monatomic layers of Fe and Ni were alternately deposited on a Cu buffer layer, all of which grew epitaxially on the Si substrates. A good crystal structure and epitaxial relationship was confirmed by in-house x-ray diffraction (XRD). The chemical order, which to some part is the origin of an uniaxial magnetic anisotropy, was measured by resonant XRD. The 0 0 1 superlattice reflection was split in two symmetrically spaced peaks due to a composition modulation of the Fe and Ni layers. Furthermore the influence of roughness induced chemical anti-phase domains on the RXRD pattern is exemplified. A smaller than expected magnetic uniaxial anisotropy energy was obtained, which is partly due to the composition modulations, but the major reason is concluded to be the Cu buffer surface roughness.
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Affiliation(s)
- Andreas Frisk
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
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18
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Hirosawa S. Current Status of Research and Development toward Permanent Magnets Free from Critical Elements. ACTA ACUST UNITED AC 2015. [DOI: 10.3379/msjmag.1504r004] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- Satoshi Hirosawa
- Elements Strategy Initiative Center for Magnetic Materials National Institute for Materials Science
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19
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Ronning F, Bader S. Rare earth replacement magnets. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:060301. [PMID: 24468738 DOI: 10.1088/0953-8984/26/6/060301] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
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