1
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Hojati FS, Ziarati M, Eghdamtalab M. Effect of operational conditions on the production of CoS2 nanoparticles. APPLIED NANOSCIENCE 2022. [DOI: 10.1007/s13204-022-02674-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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2
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DiStefano JG, Murthy AA, Hao S, Dos Reis R, Wolverton C, Dravid VP. Topology of transition metal dichalcogenides: the case of the core-shell architecture. NANOSCALE 2020; 12:23897-23919. [PMID: 33295919 DOI: 10.1039/d0nr06660e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Non-planar architectures of the traditionally flat 2D materials are emerging as an intriguing paradigm to realize nascent properties within the family of transition metal dichalcogenides (TMDs). These non-planar forms encompass a diversity of curvatures, morphologies, and overall 3D architectures that exhibit unusual characteristics across the hierarchy of length-scales. Topology offers an integrated and unified approach to describe, harness, and eventually tailor non-planar architectures through both local and higher order geometry. Topological design of layered materials intrinsically invokes elements highly relevant to property manipulation in TMDs, such as the origin of strain and its accommodation by defects and interfaces, which have broad implications for improved material design. In this review, we discuss the importance and impact of geometry on the structure and properties of TMDs. We present a generalized geometric framework to classify and relate the diversity of possible non-planar TMD forms. We then examine the nature of curvature in the emerging core-shell architecture, which has attracted high interest due to its versatility and design potential. We consider the local structure of curved TMDs, including defect formation, strain, and crystal growth dynamics, and factors affecting the morphology of core-shell structures, such as synthesis conditions and substrate morphology. We conclude by discussing unique aspects of TMD architectures that can be leveraged to engineer targeted, exotic properties and detail how advanced characterization tools enable detection of these features. Varying the topology of nanomaterials has long served as a potent methodology to engineer unusual and exotic properties, and the time is ripe to apply topological design principles to TMDs to drive future nanotechnology innovation.
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Affiliation(s)
- Jennifer G DiStefano
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA.
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3
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van Haandel L, Smolentsev G, van Bokhoven JA, Hensen EJ, Weber T. Evidence of Octahedral Co–Mo–S Sites in Hydrodesulfurization Catalysts as Determined by Resonant Inelastic X-ray Scattering and X-ray Absorption Spectroscopy. ACS Catal 2020. [DOI: 10.1021/acscatal.0c03062] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lennart van Haandel
- Eindhoven University of Technology, Het Kranenveld 14, Eindhoven 5600 MB, The Netherlands
| | | | | | - Emiel J.M. Hensen
- Eindhoven University of Technology, Het Kranenveld 14, Eindhoven 5600 MB, The Netherlands
| | - Thomas Weber
- Eindhoven University of Technology, Het Kranenveld 14, Eindhoven 5600 MB, The Netherlands
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4
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Wang J, Guo Z, Xiong W, Wang X. Synthesis of Thin-Film Metal Pyrites by an Atomic Layer Deposition Approach. Chemistry 2018; 24:18568-18574. [PMID: 30079968 DOI: 10.1002/chem.201803327] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2018] [Indexed: 11/07/2022]
Abstract
Late 3d transition metal disulfides (MS2 , M=Fe, Co, Ni, Cu, Zn) can crystallize in an interesting cubic-pyrite structure, in which all the metal cations are in a low-spin electronic configuration with progressive increase of the eg electrons for M=Fe-Zn. These metal pyrite compounds exhibit very diverse and intriguing electrical and magnetic properties, which have stimulated considerable attention for various applications, especially in cutting-edge energy conversion and storage technologies. The synthesis of the metal pyrites is certainly very important, because highly controllable, reproducible, and reliable synthesis methods are virtually essential for both fundamental materials research and practical engineering. In this Concept, a new approach of (plasma-assisted) atomic layer deposition (ALD) to synthesize the thin-film metal pyrites (FeS2 , CoS2 , NiS2 ) is introduced. The ALD synthesis approach allows for atomic-precision control over film composition and thickness, excellent film uniformity and conformality, and superior process reproducibility, and therefore it is of high promise for uniformly conformal metal pyrite thin-film coatings on complex 3D structures in general. Details and implications of this ALD approach are discussed in this Concept, mainly from a conceptual perspective, and it is envisioned that, with this new ALD synthesis approach, a significant amount of new studies will be enabled on both the fundamentals, and novel applications of the metal pyrite materials.
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Affiliation(s)
- Jue Wang
- School of Advanced Materials, Shenzhen Graduate School, Peking University, Shenzhen, 518055, P. R. China
| | - Zheng Guo
- School of Advanced Materials, Shenzhen Graduate School, Peking University, Shenzhen, 518055, P. R. China
| | - Wei Xiong
- School of Advanced Materials, Shenzhen Graduate School, Peking University, Shenzhen, 518055, P. R. China
| | - Xinwei Wang
- School of Advanced Materials, Shenzhen Graduate School, Peking University, Shenzhen, 518055, P. R. China
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5
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Houari A, Blöchl PE. Density functional study of half-metallicity and spin polarization in Fe 1-x T x S 2 with T = Mn,Ni. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:305501. [PMID: 29897339 DOI: 10.1088/1361-648x/aacc5a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Alloying effects by Mn and Ni substitution on FeS2 have been studied using density-functional calculations. Standard generalized gradient approximation (GGA) and local hybrid functional have been utilized to account for exchange-correlations. The alloys Fe1-x T x S2 with T = Mn,Ni have been investigated for concentrations [Formula: see text] together with the ground states of the pure compounds. The electronic structure is discussed with the main goal to identify candidates for ferromagnetic half-metals, which are of interest for spintronics applications. Depending on the used calculation framework, interesting candidates have been found at different concentrations. However, at mean concentration of the Mn-doping and low concentration for Ni-doping, both GGA and hybrid functional agree to predict half-metallic character. For the Mn alloys we also note the proximity to a low-spin to high spin transition.
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Affiliation(s)
- Abdesalem Houari
- Theoretical Physics Laboratory, Department of Physics, University of Bejaia, Bejaia, Algeria
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6
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Li S, Zhang Y, Niu X. Defects and impurities induced structural and electronic changes in pyrite CoS 2: first principles studies. Phys Chem Chem Phys 2018; 20:11649-11655. [PMID: 29670982 DOI: 10.1039/c8cp00443a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cobalt pyrite (CoS2) and related materials are attracting much attention due to their potential use in renewable energy applications. In this work, first-principles studies were performed to investigate the effects of various neutral defects and ion dopants on the structural, energetic, magnetic and electronic properties of the bulk CoS2. Our theoretical results show that the concentrations of single cobalt (VCo) and sulfur (VS) vacancies in CoS2 samples can be high under S-rich and S-poor conditions, respectively. Although the single vacancies induce defect states near the gap edge, they are still half-metallic. We find that the substitution of one S with the O atom does not obviously change the structural, magnetic and electronic features near the Fermi level of the system. Most transition metal impurities (MnCo, FeCo, and MoCo) and Group IV and V anion impurities (CS, SiS, NS, PS, and AsS) create impurity states that are deep and/or near the gap edge. However, NiCo and Group VII elements (FS, ClS, and BrS) cause very localized gap states close to the Fermi level in the minority spin channel, which may modify their electrochemical performances. Our extensive calculations provide instructive information for the design and optimization of CoS2-related energy materials.
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Affiliation(s)
- Shengwen Li
- Chengdu Green Energy and Green Manufacturing Technology R&D Centre, Chengdu Development Center of Science and Technology, Chengdu 610200, China
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7
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Guo Z, Wang X. Atomic Layer Deposition of the Metal Pyrites FeS2
, CoS2
, and NiS2. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201803092] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Zheng Guo
- School of Advanced Materials; Shenzhen Graduate School; Peking University; Shenzhen 518055 China
| | - Xinwei Wang
- School of Advanced Materials; Shenzhen Graduate School; Peking University; Shenzhen 518055 China
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8
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Guo Z, Wang X. Atomic Layer Deposition of the Metal Pyrites FeS2
, CoS2
, and NiS2. Angew Chem Int Ed Engl 2018; 57:5898-5902. [DOI: 10.1002/anie.201803092] [Citation(s) in RCA: 70] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Zheng Guo
- School of Advanced Materials; Shenzhen Graduate School; Peking University; Shenzhen 518055 China
| | - Xinwei Wang
- School of Advanced Materials; Shenzhen Graduate School; Peking University; Shenzhen 518055 China
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9
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Kornienko N, Resasco J, Becknell N, Jiang CM, Liu YS, Nie K, Sun X, Guo J, Leone SR, Yang P. Operando Spectroscopic Analysis of an Amorphous Cobalt Sulfide Hydrogen Evolution Electrocatalyst. J Am Chem Soc 2015; 137:7448-55. [DOI: 10.1021/jacs.5b03545] [Citation(s) in RCA: 291] [Impact Index Per Article: 32.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Nikolay Kornienko
- Department
of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
| | - Joaquin Resasco
- Department
of Chemical Engineering, University of California, Berkeley, Berkeley, California 94720, United States
| | - Nigel Becknell
- Department
of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
| | - Chang-Ming Jiang
- Department
of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
| | - Yi-Sheng Liu
- Advanced
Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Kaiqi Nie
- Advanced
Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Soochow University-Western University Centre for Synchrotron Radiation Research, Institute of Functional Nano and Soft Materials (FUNSOM) and Collaborative Innovation Center of Suzhou Nano Science & Technology, Soochow University, Suzhou 215123, China
| | - Xuhui Sun
- Soochow University-Western University Centre for Synchrotron Radiation Research, Institute of Functional Nano and Soft Materials (FUNSOM) and Collaborative Innovation Center of Suzhou Nano Science & Technology, Soochow University, Suzhou 215123, China
| | - Jinghua Guo
- Advanced
Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Stephen R. Leone
- Department
of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
- Chemical
Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron
Road, Berkeley, California 94720, United States
- Department
of Physics, University of California, Berkeley, Berkeley, California 94720, United States
| | - Peidong Yang
- Department
of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
- Materials
Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron
Road, Berkeley, California 94720, United States
- Kavli Energy Nanoscience Institute, Berkeley, California 94720, United States
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10
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Li B, Huang L, Zhong M, Huo N, Li Y, Yang S, Fan C, Yang J, Hu W, Wei Z, Li J. Synthesis and transport properties of large-scale alloy Co(0.16)Mo(0.84)S2 bilayer nanosheets. ACS NANO 2015; 9:1257-62. [PMID: 25584859 DOI: 10.1021/nn505048y] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Synthesis of large-scale highly crystalline two-dimensional alloys is significant for revealing properties. Here, we have investigated the vapor growth process of high-quality bilayer CoxMo1-xS2 (x = 0.16) hexagonal nanosheets systematically. As the initial loading of the sulfur increases, the morphology of the CoxMo1-xS2 (0 < x ≤ 1) nanosheets becomes hexagons from David stars step by step at 680 °C. We find that Co atoms mainly distribute at the edge of nanosheets. When the temperature increases from 680 to 750 °C, high-quality cubic pyrite-type crystal structure CoS2 grows on the surface of CoxMo1-xS2 nanosheet gradually and forms hexagonal film induced by the nanosheet. Electrical transport measurements reveal that the CoxMo1-xS2 nanosheets and CoS2 films exhibit n-type semiconducting transport behavior and half-metallic behavior, respectively. Theoretical calculations of their band structures agree well with the experimental results.
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Affiliation(s)
- Bo Li
- Institute of Semiconductors, Chinese Academy of Sciences , Beijing 100083, People's Republic of China
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11
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Li B, Huang L, Zhong M, Wei Z, Li J. Electrical and magnetic properties of FeS2 and CuFeS2 nanoplates. RSC Adv 2015. [DOI: 10.1039/c5ra16918f] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The as-made pyrite (FeS2) and chalcopyrite (CuFeS2) nanoplates exhibit abnormal strong ferromagnetic behavior due to the dangling bonds on surface.
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Affiliation(s)
- Bo Li
- State Key Laboratory for Superlattices and Microstructures Institute of Semiconductors
- Chinese Academy of Sciences
- Beijing 100083
- China
| | - Le Huang
- State Key Laboratory for Superlattices and Microstructures Institute of Semiconductors
- Chinese Academy of Sciences
- Beijing 100083
- China
| | - Mianzeng Zhong
- State Key Laboratory for Superlattices and Microstructures Institute of Semiconductors
- Chinese Academy of Sciences
- Beijing 100083
- China
| | - Zhongming Wei
- State Key Laboratory for Superlattices and Microstructures Institute of Semiconductors
- Chinese Academy of Sciences
- Beijing 100083
- China
| | - Jingbo Li
- State Key Laboratory for Superlattices and Microstructures Institute of Semiconductors
- Chinese Academy of Sciences
- Beijing 100083
- China
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12
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Herbert F, Krishnamoorthy A, Ma W, Van Vliet K, Yildiz B. Dynamics of point defect formation, clustering and pit initiation on the pyrite surface. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2014.02.048] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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13
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Reshak AH. Fe2MnSixGe1−x: influence thermoelectric properties of varying the germanium content. RSC Adv 2014. [DOI: 10.1039/c4ra02669a] [Citation(s) in RCA: 141] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The semi-classical Boltzmann theory, as implemented in the BoltzTraP code, was used to study the influence of varying the germanium content on the thermoelectric properties of the Heusler compounds, Fe2MnSixGe1−x (x = 0.0, 0.25, 0.5, 0.75 and 1.0).
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Affiliation(s)
- A. H. Reshak
- New Technologies – Research Centre
- University of West Bohemia
- 306 14 Pilsen, Czech Republic
- Center of Excellence Geopolymer and Green Technology
- School of Material Engineering
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14
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Zhang X, Wu N, Manno M, Leighton C, Vescovo E, Dowben PA. Resonant photoemission and spin polarization of Co(1-x)Fe(x)S(2). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2013; 25:012001. [PMID: 23160359 DOI: 10.1088/0953-8984/25/1/012001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The valence band occupied state electronic structure of Co(1-x)Fe(x)S(2) in the region of the Fe/Co 3d bands has been investigated using photoemission and spin-polarized photoemission. As measured by using spin-polarized ultraviolet photoemission, the surface Fermi level spin polarization of Co(1-x)Fe(x)S(2) thin films at 50 K, specifically at x = 0, 0.05, 0.10 and 0.15, was found to be much reduced compared to that of the bulk. The spin polarization nonetheless increases with Fe concentration. The resonant photoemission spectroscopy provides evidence that S bands have a strong resonance at the photon energy corresponding to the Co 2p core level, indicating strong hybridization between Co and S bands in Co(1-x)Fe(x)S(2) (at small x). Similar evidence exists for Fe hybridization with the S bands.
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Affiliation(s)
- Xin Zhang
- Nebraska Center for Materials and Nanoscience, Department of Physics and Astronomy, University of Nebraska-Lincoln, 68588-0299, USA
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15
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Eghbalnia M, Dixon DG. In situ electrochemical characterization of natural pyrite as a galvanic catalyst using single-particle microelectrode technique in ferric sulfate solutions. J Solid State Electrochem 2012. [DOI: 10.1007/s10008-012-1873-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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16
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Piñeiro A, Botana AS, Pardo V, Baldomir D. Fermiology and magnetism in weak itinerant ferromagnet CoS2: an ab initio study. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:505602. [PMID: 21406803 DOI: 10.1088/0953-8984/22/50/505602] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Electronic structure calculations have been performed on the compound CoS(2), an itinerant ferromagnet whose magnetic properties can be understood in terms of spin fluctuation theory. We have identified nesting features in the Fermi surface of the compound, active for long wavelength spin fluctuations. The electronic structure of the material is close to a half-metal. We show the importance of introducing spin-orbit coupling (SOC) in the calculations, which partially destroys the half-metallicity of the material. By means of transport properties calculations, we have quantified the influence of SOC in the conductivity at room temperature. Analyzing the effect of SOC helps in understanding the negative magnetoresistance of the material, whose conductivity varies within a few per cent with the introduction of small perturbations in the states around the Fermi level.
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Affiliation(s)
- A Piñeiro
- Departamento de Física Aplicada, Universidad de Santiago de Compostela, Santiago de Compostela, Spain.
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17
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Utfeld C, Giblin SR, Taylor JW, Duffy JA, Shenton-Taylor C, Laverock J, Dugdale SB, Manno M, Leighton C, Itou M, Sakurai Y. Bulk spin polarization of Co(1-x)Fe(x)S2. PHYSICAL REVIEW LETTERS 2009; 103:226403. [PMID: 20366116 DOI: 10.1103/physrevlett.103.226403] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2009] [Indexed: 05/29/2023]
Abstract
We report on a new method to determine the degree of bulk spin polarization in single crystal Co(1-x)Fe(x)S2 by modeling magnetic Compton scattering with ab initio calculations. Spin-dependent Compton profiles were measured for CoS2 and Co0.9Fe0.1S2. The ab initio calculations were then refined by rigidly shifting the bands to provide the best fit between the calculated and experimental directional profiles for each sample. The bulk spin polarizations, P, corresponding to the spin-polarized density of states at the Fermi level, were then extracted from the refined calculations. The values were found to be P=-72+/-6% and P=18+/-7% for CoS2 and Co0.9Fe0.1S2, respectively. Furthermore, determinations of P weighted by the Fermi velocity (v(F) or v(F)2) were obtained, permitting a rigorous comparison with other experimental data and highlighting the experimental dependence of P on v(F).
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Affiliation(s)
- C Utfeld
- H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom
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18
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Ahuja R, Eriksson O, Johansson B. Electronic and optical properties of FeS2 and CoS2. ACTA ACUST UNITED AC 2009. [DOI: 10.1080/13642819808206748] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- R. Ahuja
- a Condensed Matter Theory Group, Department of Physics , Uppsala University , Box 530, S-751 21 , Uppsala , Sweden
| | - O. Eriksson
- a Condensed Matter Theory Group, Department of Physics , Uppsala University , Box 530, S-751 21 , Uppsala , Sweden
| | - B. Johansson
- a Condensed Matter Theory Group, Department of Physics , Uppsala University , Box 530, S-751 21 , Uppsala , Sweden
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19
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Wu N, Sabirianov RF, Mei WN, Losovyj YB, Lozova N, Manno M, Leighton C, Dowben PA. The minority spin surface bands of CoS(2)(001). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:295501. [PMID: 21828532 DOI: 10.1088/0953-8984/21/29/295501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Angle-resolved photoemission was used to study the surface electronic band structure of high quality single crystals of ferromagnetic CoS(2) (below 120 K). Strongly dispersing Co t(2g) bands are identified along the ⟨100⟩ [Formula: see text] direction, the [Formula: see text]-[Formula: see text] line of the surface Brillouin zone, in agreement with model calculations. The calculated surface band structure includes corrections for the previously determined surface structure of CoS(2)(001) and is in general agreement with the experimental photoemission spectra in the region of the Fermi level. There is evidence of the existence of several minority spin surface states, falling into a gap of the projected minority spin bulk CoS(2)(001) band structure.
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Affiliation(s)
- Ning Wu
- Department of Physics and Astronomy and the Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, NE 68588-0111, USA
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20
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Leighton C, Manno M, Cady A, Freeland JW, Wang L, Umemoto K, Wentzcovitch RM, Chen TY, Chien CL, Kuhns PL, Hoch MJR, Reyes AP, Moulton WG, Dahlberg ED, Checkelsky J, Eckert J. Composition controlled spin polarization in Co(1-x)Fe(x)S(2) alloys. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2007; 19:315219. [PMID: 21694119 DOI: 10.1088/0953-8984/19/31/315219] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The transition metal (TM) chalcogenides of the form TMX(2) (X = S or Se) have been studied for decades due to their interesting electronic and magnetic properties such as metamagnetism and metal-insulator transitions. In particular, the Co(1-x)Fe(x)S(2) alloys were the subject of investigation in the 1970s due to general interest in itinerant ferromagnetism. In recent years (2000-present) it has been shown, both by electronic structure calculations and detailed experimental investigations, that Co(1-x)Fe(x)S(2) is a model system for the investigation of highly spin polarized ferromagnetism. The radically different electronic properties of the two endpoint compounds (CoS(2) is a narrow bandwidth ferromagnetic metal, while FeS(2) is a diamagnetic semiconductor), in a system forming a substitutional solid solution allows for composition control of the Fermi level relative to the spin split bands, and therefore composition-controlled conduction electron spin polarization. In essence, the recent work has shown that the concept of 'band engineering' can be applied to half-metallic ferromagnets and that high spin polarization can be deliberately engineered. Experiments reveal tunability in both sign and magnitude of the spin polarization at the Fermi level, with maximum values obtained to date of 85% at low temperatures. In this paper we review the properties of Co(1-x)Fe(x)S(2) alloys, with an emphasis on properties of relevance to half-metallicity. Crystal structure, electronic structure, synthesis, magnetic properties, transport properties, direct probes of the spin polarization, and measurements of the total density of states at the Fermi level are all discussed. We conclude with a discussion of the factors that influence, or even limit, the spin polarization, along with a discussion of opportunities and problems for future investigation, particularly with regard to fundamental studies of spintronic devices.
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Affiliation(s)
- C Leighton
- Department of Chemical Engineering and Materials Science, University of Minnesota, USA
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21
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Felser C, Fecher G, Balke B. Spintronik: eine Herausforderung für Materialwissenschaften und Festkörperchemie. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200601815] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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22
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Felser C, Fecher GH, Balke B. Spintronics: A Challenge for Materials Science and Solid-State Chemistry. Angew Chem Int Ed Engl 2007; 46:668-99. [PMID: 17219604 DOI: 10.1002/anie.200601815] [Citation(s) in RCA: 199] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Spintronics is a multidisciplinary field involving physics, chemistry, and engineering, and is a new research area for solid-state scientists. A variety of new materials must be found to satisfy different demands. The search for ferromagnetic semiconductors and stable half-metallic ferromagnets with Curie temperatures higher than room temperature remains a priority for solid-state chemistry. A general understanding of structure-property relationships is a necessary prerequisite for the design of new materials. In this Review, the most important developments in the field of spintronics are described from the point of view of materials science.
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Affiliation(s)
- Claudia Felser
- Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany.
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Wang L, Umemoto K, Wentzcovitch RM, Chen TY, Chien CL, Checkelsky JG, Eckert JC, Dahlberg ED, Leighton C. Co1-xFexS2: a tunable source of highly spin-polarized electrons. PHYSICAL REVIEW LETTERS 2005; 94:056602. [PMID: 15783672 DOI: 10.1103/physrevlett.94.056602] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2004] [Indexed: 05/24/2023]
Abstract
In the emerging field of spin-electronics ideal ferromagnetic electron sources would not only possess a high degree of spin polarization, but would also offer control over the magnitude of this polarization. We demonstrate here that a simple scheme can be utilized to control both the magnitude and the sign of the spin polarization of ferromagnetic CoS2, which we probe with a variety of techniques. The position of the Fermi level is fine-tuned by solid solution alloying with the isostructural diamagnetic semiconductor FeS2, leading to tunable spin polarization of up to 85%.
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Affiliation(s)
- L Wang
- Department of Chemical Engineering and Materials Science, University of Minnesota, USA
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Byczuk K, Ulmke M, Vollhardt D. Ferromagnetism and metal-insulator transition in the disordered Hubbard model. PHYSICAL REVIEW LETTERS 2003; 90:196403. [PMID: 12785963 DOI: 10.1103/physrevlett.90.196403] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2002] [Indexed: 05/24/2023]
Abstract
A detailed study of the paramagnetic to ferromagnetic phase transition in the one-band Hubbard model in the presence of binary-alloy disorder is presented. The influence of the disorder (with concentrations x and 1-x of the two alloy ions) on the Curie temperature T(c) is found to depend strongly on electron density n. While at high densities, n>x, the disorder always reduces T(c); at low densities, n<x, the disorder can even enhance T(c) if the interaction is strong enough. At the particular density n=x (i.e., not necessarily at half-filling) the interplay between disorder-induced band splitting and correlation induced Mott transition gives rise to a new type of metal-insulator transition.
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Affiliation(s)
- Krzysztof Byczuk
- Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute for Physics, University of Augsburg, D-86135 Augsburg, Germany
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Wright K, Vaughan DJ. Application of Computer Simulation Methods to the Study of Metal Sulphide Minerals. MOLECULAR SIMULATION 1998. [DOI: 10.1080/08927029808022053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Muro T, Shishidou T, Oda F, Fukawa T, Yamada H, Kimura A, Imada S, Suga S, Park SY, Miyahara T, Sato K. Magnetic circular dichroism of the S 2p, Co 2p, and Co 3p core absorption and orbital angular momentum of the Co 3d state in low-spin CoS2. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:7055-7058. [PMID: 9982150 DOI: 10.1103/physrevb.53.7055] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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