Stoichiometry dependent phase transition in Mn-Co-Ga-based thin films: From cubic in-plane, soft magnetized to tetragonal perpendicular, hard magnetized

Siham Ouardi; Takahide Kubota; Gerhard H. Fecher; Rolf Stinshoff; Shigemi Mizukami; Terunobu Miyazaki; Eiji Ikenaga; Claudia Felser

doi:10.1063/1.4770303

Stoichiometry dependent phase transition in Mn-Co-Ga-based thin films: From cubic in-plane, soft magnetized to tetragonal perpendicular, hard magnetized

Siham Ouardi, Takahide Kubota, Gerhard H. Fecher, Rolf Stinshoff, Shigemi Mizukami, Terunobu Miyazaki, Eiji Ikenaga, Claudia Felser

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

35 Citations (Scopus)

Abstract

Epitaxial thin films of Mn_3-x Co_x Ga were grown on MgO by magnetron co-sputtering with different Co content. Dependent on the Co content tetragonal or cubic structures are obtained. The composition dependence of saturation magnetization M_S and uniaxial magnetic anisotropy K_u in the epitaxial films were investigated. A high magnetic anisotropy K_u of 1.2 MJ m^-3 was achieved for the Mn _2.6Co_0.3Ga_1.1 film with low magnetic moment of 0.84 μ_B. The valence band spectra of the films were investigated mainly by hard x-ray photoelectron spectroscopy. The evidence of sharp states in the cubic case, which are smeared out in the tetragonal case, proof the existence of a van Hove singularity that causes a band Jahn-Teller effect accompanied by a tetragonal distortion. These differences are in well agreement to the ab-initio calculations of the electronic structure.

Original language	English
Article number	242406
Journal	Applied Physics Letters
Volume	101
Issue number	24
DOIs	https://doi.org/10.1063/1.4770303
Publication status	Published - 2012 Dec 10

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.4770303

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@article{0df150e29ce2466087d993514d0182be,

title = "Stoichiometry dependent phase transition in Mn-Co-Ga-based thin films: From cubic in-plane, soft magnetized to tetragonal perpendicular, hard magnetized",

abstract = "Epitaxial thin films of Mn3-x Cox Ga were grown on MgO by magnetron co-sputtering with different Co content. Dependent on the Co content tetragonal or cubic structures are obtained. The composition dependence of saturation magnetization MS and uniaxial magnetic anisotropy Ku in the epitaxial films were investigated. A high magnetic anisotropy Ku of 1.2 MJ m-3 was achieved for the Mn 2.6Co0.3Ga1.1 film with low magnetic moment of 0.84 μB. The valence band spectra of the films were investigated mainly by hard x-ray photoelectron spectroscopy. The evidence of sharp states in the cubic case, which are smeared out in the tetragonal case, proof the existence of a van Hove singularity that causes a band Jahn-Teller effect accompanied by a tetragonal distortion. These differences are in well agreement to the ab-initio calculations of the electronic structure.",

author = "Siham Ouardi and Takahide Kubota and Fecher, {Gerhard H.} and Rolf Stinshoff and Shigemi Mizukami and Terunobu Miyazaki and Eiji Ikenaga and Claudia Felser",

note = "Funding Information: The authors gratefully acknowledge financial support by the DfG-JST (P 1.3-A and 2.1-A in FOR 1464 ASPIMATT). The synchrotron based HAXPES measurements were performed at BL47XU of SPring-8 with approval of JASRI (Proposal No. 2012A0043). ",

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doi = "10.1063/1.4770303",

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T2 - From cubic in-plane, soft magnetized to tetragonal perpendicular, hard magnetized

AU - Ouardi, Siham

AU - Kubota, Takahide

AU - Fecher, Gerhard H.

AU - Stinshoff, Rolf

AU - Mizukami, Shigemi

AU - Miyazaki, Terunobu

AU - Ikenaga, Eiji

AU - Felser, Claudia

N1 - Funding Information: The authors gratefully acknowledge financial support by the DfG-JST (P 1.3-A and 2.1-A in FOR 1464 ASPIMATT). The synchrotron based HAXPES measurements were performed at BL47XU of SPring-8 with approval of JASRI (Proposal No. 2012A0043).

PY - 2012/12/10

Y1 - 2012/12/10

N2 - Epitaxial thin films of Mn3-x Cox Ga were grown on MgO by magnetron co-sputtering with different Co content. Dependent on the Co content tetragonal or cubic structures are obtained. The composition dependence of saturation magnetization MS and uniaxial magnetic anisotropy Ku in the epitaxial films were investigated. A high magnetic anisotropy Ku of 1.2 MJ m-3 was achieved for the Mn 2.6Co0.3Ga1.1 film with low magnetic moment of 0.84 μB. The valence band spectra of the films were investigated mainly by hard x-ray photoelectron spectroscopy. The evidence of sharp states in the cubic case, which are smeared out in the tetragonal case, proof the existence of a van Hove singularity that causes a band Jahn-Teller effect accompanied by a tetragonal distortion. These differences are in well agreement to the ab-initio calculations of the electronic structure.

AB - Epitaxial thin films of Mn3-x Cox Ga were grown on MgO by magnetron co-sputtering with different Co content. Dependent on the Co content tetragonal or cubic structures are obtained. The composition dependence of saturation magnetization MS and uniaxial magnetic anisotropy Ku in the epitaxial films were investigated. A high magnetic anisotropy Ku of 1.2 MJ m-3 was achieved for the Mn 2.6Co0.3Ga1.1 film with low magnetic moment of 0.84 μB. The valence band spectra of the films were investigated mainly by hard x-ray photoelectron spectroscopy. The evidence of sharp states in the cubic case, which are smeared out in the tetragonal case, proof the existence of a van Hove singularity that causes a band Jahn-Teller effect accompanied by a tetragonal distortion. These differences are in well agreement to the ab-initio calculations of the electronic structure.

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Stoichiometry dependent phase transition in Mn-Co-Ga-based thin films: From cubic in-plane, soft magnetized to tetragonal perpendicular, hard magnetized

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