1
|
Thermodynamics and Magnetism of SmFe12 Compound Doped with Co and Ni: An Ab Initio Study. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12104860] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Ni-doped Sm(Fe1−xCox)12 alloys are investigated for their magnetic properties. The Sm(Fe,Co)11M1 compound (M acts as a stabilizer) with the smallest (7.7 at.%) rare-earth-metal content has been recognized as a possible contender for highly efficient permanent magnets thanks to its significant anisotropy field and Curie temperature. The early transition metals (Ti-Mn) as well as Al, Si, and Ga stabilize the SmFe12 compound but significantly decrease its saturation magnetization. To keep the saturation magnetization in the range of 1.4–1.6 T, we suggest replacing a certain amount of Fe and Co in the Sm(Fe1−xCox)12 alloys with Ni. Ni plays the role of a thermodynamic stabilizer, and contrary to the above-listed elements, has the spin moment aligned parallel to the spin moment of the SmFe12 compound, thereby boosting its saturation magnetization without affecting the anisotropy field or Curie temperature.
Collapse
|
2
|
Takahashi YK, Sepehri-Amin H, Ohkubo T. Recent advances in SmFe 12-based permanent magnets. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2021; 22:449-460. [PMID: 34211334 PMCID: PMC8221137 DOI: 10.1080/14686996.2021.1913038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Revised: 03/17/2021] [Accepted: 03/29/2021] [Indexed: 06/13/2023]
Abstract
To realize a sustainable society, 'green technology' with low (or even zero) CO2 emissions is required. A key material in such technology is a permanent magnet because it is utilized for electric-power conversion in several applications including electric vehicles (EVs), hybrid EVs (HEVs), and turbines for wind power generation. To realize highly efficient electric-power conversion, a stronger permanent magnet than Nd-Fe-B is necessary. One potential candidate is a Fe-rich SmFe12-based compound with a ThMn12 structure. In this paper, the phase stability, structure, and intrinsic and extrinsic magnetic properties in both film and bulk forms are reviewed. Based on these results, a possible way to realize a strong SmFe12-based permanent magnet in bulk form is discussed.
Collapse
Affiliation(s)
- Y. K. Takahashi
- Research Center for Magnetic and Spintronic Materials, National Institute for Materials Science, Tsukuba, Japan
| | - H. Sepehri-Amin
- Research Center for Magnetic and Spintronic Materials, National Institute for Materials Science, Tsukuba, Japan
| | - T. Ohkubo
- Research Center for Magnetic and Spintronic Materials, National Institute for Materials Science, Tsukuba, Japan
| |
Collapse
|
3
|
Tereshina IS, Kostyuchenko NV, Tereshina-Chitrova EA, Skourski Y, Doerr M, Pelevin IA, Zvezdin AK, Paukov M, Havela L, Drulis H. ThMn 12-type phases for magnets with low rare-earth content: Crystal-field analysis of the full magnetization process. Sci Rep 2018; 8:3595. [PMID: 29483577 PMCID: PMC5827763 DOI: 10.1038/s41598-018-21756-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2017] [Accepted: 02/12/2018] [Indexed: 12/02/2022] Open
Abstract
Rare-earth (R)-iron alloys are a backbone of permanent magnets. Recent increase in price of rare earths has pushed the industry to seek ways to reduce the R-content in the hard magnetic materials. For this reason strong magnets with the ThMn12 type of structure came into focus. Functional properties of R(Fe,T)12 (T-element stabilizes the structure) compounds or their interstitially modified derivatives, R(Fe,T)12-X (X is an atom of hydrogen or nitrogen) are determined by the crystal-electric-field (CEF) and exchange interaction (EI) parameters. We have calculated the parameters using high-field magnetization data. We choose the ferrimagnetic Tm-containing compounds, which are most sensitive to magnetic field and demonstrate that TmFe11Ti-H reaches the ferromagnetic state in the magnetic field of 52 T. Knowledge of exact CEF and EI parameters and their variation in the compounds modified by the interstitial atoms is a cornerstone of the quest for hard magnetic materials with low rare-earth content.
Collapse
Affiliation(s)
- I S Tereshina
- Faculty of Physics, Lomonosov Moscow State University, 119991, Moscow, Russia.
| | - N V Kostyuchenko
- Moscow Institute of Physics and Technology, Dolgoprudny, Moscow region, 9 Institutsky Per., Dolgoprudny, 141700, Russia
- Institut für Festkörperphysik, Technische Universität Wien, Vienna, Austria
| | | | - Y Skourski
- Hochfeld-Magnetlabor Dresden (HLD), Helmholtz-Zentrum Dresden-Rossendorf, D-01314, Dresden, Germany
| | - M Doerr
- Technische Universität Dresden, D-01062, Dresden, Germany
| | - I A Pelevin
- Baikov Institute of Metallurgy and Materials Science RAS, 119991, Moscow, Russia
| | - A K Zvezdin
- A. M. Prokhorov General Physics Institute of Russian Academy of Sciences, Moscow, 38 Vavilov Str., 119991, Russia
- National Research University Higher School of Economics, Myasnitskaya 20, Moscow, 101000, Russia
| | - M Paukov
- Faculty of Mathematics and Physics, Charles University, Prague, 12116, Czech Republic
- Immanuel Kant Baltic Federal University, Kaliningrad, 236016, Russia
| | - L Havela
- Faculty of Mathematics and Physics, Charles University, Prague, 12116, Czech Republic
| | - H Drulis
- Faculty of Mathematics and Physics, Charles University, Prague, 12116, Czech Republic
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 50-950, Wroclaw, Poland
| |
Collapse
|
4
|
Semenova E, Lyakhova M, Karpenkov D, Kuznetsova Y, Karpenkov A, Skokov K. Stress-induced magnetic domain structure in DyFe 11Ti compound. EPJ WEB OF CONFERENCES 2018. [DOI: 10.1051/epjconf/201818504027] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In this work, we present the results of the DyFe11Ti compound magnetic domain structure (DS) exploration. It was found that mechanical polishing leads to a change of the anisotropy of the surface layer, which affects the magnetic DS configuration. It is established that the equilibrium structure of the surface domains is restored through time under unchanged external conditions. It is suggested that the mechanism of DS relaxation has thermal fluctuation nature.
Collapse
|
5
|
Susilo RA, Cadogan JM, Hutchison WD, Stewart GA, Avdeev M, Campbell SJ. Magnetic structure and spin reorientation of quaternary Dy 2Fe 2Si 2C. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:115806. [PMID: 28170354 DOI: 10.1088/1361-648x/aa52f9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We have investigated the low temperature magnetic properties of Dy2Fe2Si2C by using magnetisation, specific heat, x-ray diffraction, neutron powder diffraction and 57Fe Mössbauer spectroscopy measurements over the temperature range 1.5 K-300 K. Dy2Fe2Si2C exhibits two magnetic transitions at low temperatures: an antiferromagnetic transition at [Formula: see text] K and a spin-reorientation transition at [Formula: see text] K. The magnetic structure above T t can be described with a propagation vector [Formula: see text] with the ordering of the Dy magnetic moments along the monoclinic b-axis whereas on cooling below T t the Dy moment tips away from the b-axis towards the ac-plane. We find that the spin-reorientation in Dy2Fe2Si2C is mainly driven by the competition between the second-order crystal field term B 20 and the higher-order terms, in particular B 40 and B 64.
Collapse
Affiliation(s)
- R A Susilo
- School of Physical, Environmental and Mathematical Sciences, UNSW Canberra at the Australian Defence Force Academy, Canberra BC 2610, Australia
| | | | | | | | | | | |
Collapse
|
6
|
Gorbunov DI, Yasin S, Andreev AV, Skourski Y, Arnold Z, Zherlitsyn S, Wosnitza J. High-field magnetization and magnetoelasticity of single crystalline HoFe5Al7. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:136001. [PMID: 24625813 DOI: 10.1088/0953-8984/26/13/136001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Magnetization and ultrasound measurements have been performed in pulsed magnetic fields up to 60 T on a ferrimagnetic HoFe5Al7 single crystal (Curie temperature TC = 216 K, compensation point Tcomp = 65 K) with a tetragonal crystal structure of the ThMn12-type. The compound exhibits a high magnetic anisotropy of the easy-plane type. A large anisotropy is also observed within the basal plane having an easy-magnetization direction along the [110] axis with the spontaneous magnetic moment Ms = 2 µB/f.u. at T = 2 K. Along the easy axis, two first-order field-induced magnetic transitions are observed. At both transitions sharp anomalies in the acoustic properties are found. The critical fields of the transitions depend on temperature in a different manner. Within molecular-field theory and using the high-field magnetization data the Ho-Fe inter-sublattice exchange parameter has been determined to be nHoFe ≈ 4 T/µB. The magnetoelasticity has also been probed by magnetization measurements under hydrostatic pressure. TC decreases with a rate dTC/dp = -10 K/GPa, whereas Tcomp increases with dTcomp/dp = 3.5 K/GPa.
Collapse
Affiliation(s)
- D I Gorbunov
- Institute of Physics, Academy of Sciences, Na Slovance 2, 182 21 Prague, Czech Republic. Department of Condensed Matter Physics, Charles University, Ke Karlovu 5, 121 16 Prague, Czech Republic
| | | | | | | | | | | | | |
Collapse
|
7
|
|
8
|
Buschow K. Chapter 4 Magnetism and processing of permanent magnet materials. HANDBOOK OF MAGNETIC MATERIALS 1997. [DOI: 10.1016/s1567-2719(97)10008-7] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
|
9
|
García LM, Bartolomé J, Lázaro FJ, Muñoz JM. Magnetic disaccommodation phenomena in rare-earth intermetallic compounds. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:15238-15250. [PMID: 9985586 DOI: 10.1103/physrevb.54.15238] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
10
|
Kou XC, Grössinger R, Hilscher G, Kirchmayr HR. ac susceptibility study on R2Fe14B single crystals (R=Y, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm). PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:6421-6429. [PMID: 9986660 DOI: 10.1103/physrevb.54.6421] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
11
|
Chen D, Skumryev V, Coey JM. Domain-wall dynamics in aligned bound Sm2Fe17. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:15014-15022. [PMID: 9983297 DOI: 10.1103/physrevb.53.15014] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
12
|
Kou XC, Grössinger R, Wiesinger G, Liu JP, Kleinschroth I, Kronmüller H. Intrinsic magnetic properties of RFe10Mo2 compounds (R=Y, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, or Tm). PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:8254-8265. [PMID: 9977435 DOI: 10.1103/physrevb.51.8254] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
13
|
Hu BP, Wang KY, Wang YZ, Wang ZX, Yan QW, Zhang PL, Sun XD. Structure and magnetic properties of RFe11.35Nb0.65 and RFe11.35Nb0.65Ny (R=Y, Sm, Gd, Tb, Dy, Ho, Er, and Lu). PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:2905-2919. [PMID: 9979067 DOI: 10.1103/physrevb.51.2905] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
14
|
Nagamine LC, Rechenberg HR, Algarabel PA, Ibarra MR. Magnetic phase diagram of (DyxGd1-x)Fe11Ti alloys. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:12659-12664. [PMID: 9975429 DOI: 10.1103/physrevb.50.12659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
15
|
Kou XC, Kronmüller H, Givord D, Rossignol MF. Coercivity mechanism of sintered Pr17Fe75B8 and Pr17Fe53B30 permanent magnets. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:3849-3860. [PMID: 9976663 DOI: 10.1103/physrevb.50.3849] [Citation(s) in RCA: 81] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|