Effect of Fe substitution on the magnetic properties of half-Heusler alloy CoCrAl

Hongzhi Luo; Heyan Liu; Xiao Yu; Yangxian Li; Wei Zhu; Guangheng Wu; Xiaoxi Zhu; Chengbao Jiang; Huibin Xu

doi:10.1016/j.jmmm.2008.11.097

Effect of Fe substitution on the magnetic properties of half-Heusler alloy CoCrAl

Hongzhi Luo^*
, Heyan Liu
, Xiao Yu
, Yangxian Li
, Wei Zhu
, Guangheng Wu
, Xiaoxi Zhu
, Chengbao Jiang
, Huibin Xu

^*Corresponding author for this work

School of Materials Science and Engineering

Hebei University of Technology
CAS - Institute of Physics
Beihang University

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

The effect of Fe substitution for the vacant site in half-Heusler alloy CoCrAl is studied. A series of single phase CoFe_xCrAl (x=0.0, 0.25, 0.5, 0.75 and 1.0) alloys has been successfully synthesized. The lattice constant is found to increase almost linearly with increasing Fe content, indicating Fe atoms enter the lattice of CoCrAl instead of existing as a secondary phase. When Fe entering the vacant site, spin polarization occurs and the alloy turns from a semimetal in CoCrAl to a half-metallic ferromagnet (HMF) in CoFeCrAl. This is due to the reconstruction of the energy band with Fe substitution. The Curie temperature and saturation magnetic moments are enhanced and increase monotonically with increasing Fe content. The variation of the spin moment follows the Slater-Pauling curve and agrees with the theoretical calculation as well.

Original language	English
Pages (from-to)	1321-1324
Number of pages	4
Journal	Journal of Magnetism and Magnetic Materials
Volume	321
Issue number	9
DOIs	https://doi.org/10.1016/j.jmmm.2008.11.097
State	Published - May 2009

Keywords

Band structure
Half-metallicity
Heusler alloy
Magnetic properties

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10.1016/j.jmmm.2008.11.097

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title = "Effect of Fe substitution on the magnetic properties of half-Heusler alloy CoCrAl",

abstract = "The effect of Fe substitution for the vacant site in half-Heusler alloy CoCrAl is studied. A series of single phase CoFexCrAl (x=0.0, 0.25, 0.5, 0.75 and 1.0) alloys has been successfully synthesized. The lattice constant is found to increase almost linearly with increasing Fe content, indicating Fe atoms enter the lattice of CoCrAl instead of existing as a secondary phase. When Fe entering the vacant site, spin polarization occurs and the alloy turns from a semimetal in CoCrAl to a half-metallic ferromagnet (HMF) in CoFeCrAl. This is due to the reconstruction of the energy band with Fe substitution. The Curie temperature and saturation magnetic moments are enhanced and increase monotonically with increasing Fe content. The variation of the spin moment follows the Slater-Pauling curve and agrees with the theoretical calculation as well.",

keywords = "Band structure, Half-metallicity, Heusler alloy, Magnetic properties",

author = "Hongzhi Luo and Heyan Liu and Xiao Yu and Yangxian Li and Wei Zhu and Guangheng Wu and Xiaoxi Zhu and Chengbao Jiang and Huibin Xu",

year = "2009",

month = may,

doi = "10.1016/j.jmmm.2008.11.097",

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volume = "321",

pages = "1321--1324",

journal = "Journal of Magnetism and Magnetic Materials",

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T1 - Effect of Fe substitution on the magnetic properties of half-Heusler alloy CoCrAl

AU - Luo, Hongzhi

AU - Liu, Heyan

AU - Yu, Xiao

AU - Li, Yangxian

AU - Zhu, Wei

AU - Wu, Guangheng

AU - Zhu, Xiaoxi

AU - Jiang, Chengbao

AU - Xu, Huibin

PY - 2009/5

Y1 - 2009/5

N2 - The effect of Fe substitution for the vacant site in half-Heusler alloy CoCrAl is studied. A series of single phase CoFexCrAl (x=0.0, 0.25, 0.5, 0.75 and 1.0) alloys has been successfully synthesized. The lattice constant is found to increase almost linearly with increasing Fe content, indicating Fe atoms enter the lattice of CoCrAl instead of existing as a secondary phase. When Fe entering the vacant site, spin polarization occurs and the alloy turns from a semimetal in CoCrAl to a half-metallic ferromagnet (HMF) in CoFeCrAl. This is due to the reconstruction of the energy band with Fe substitution. The Curie temperature and saturation magnetic moments are enhanced and increase monotonically with increasing Fe content. The variation of the spin moment follows the Slater-Pauling curve and agrees with the theoretical calculation as well.

AB - The effect of Fe substitution for the vacant site in half-Heusler alloy CoCrAl is studied. A series of single phase CoFexCrAl (x=0.0, 0.25, 0.5, 0.75 and 1.0) alloys has been successfully synthesized. The lattice constant is found to increase almost linearly with increasing Fe content, indicating Fe atoms enter the lattice of CoCrAl instead of existing as a secondary phase. When Fe entering the vacant site, spin polarization occurs and the alloy turns from a semimetal in CoCrAl to a half-metallic ferromagnet (HMF) in CoFeCrAl. This is due to the reconstruction of the energy band with Fe substitution. The Curie temperature and saturation magnetic moments are enhanced and increase monotonically with increasing Fe content. The variation of the spin moment follows the Slater-Pauling curve and agrees with the theoretical calculation as well.

KW - Band structure

KW - Half-metallicity

KW - Heusler alloy

KW - Magnetic properties

UR - https://www.scopus.com/pages/publications/61849097267

U2 - 10.1016/j.jmmm.2008.11.097

DO - 10.1016/j.jmmm.2008.11.097

M3 - 文章

AN - SCOPUS:61849097267

SN - 0304-8853

VL - 321

SP - 1321

EP - 1324

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - 9

ER -

Effect of Fe substitution on the magnetic properties of half-Heusler alloy CoCrAl

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Keywords

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