Electronic structure and magneto-optical Kerr spectra of an epitaxial Ni54.3Mn31.9Sn13.8 Heusler alloy film

被引：10

作者：

Uba, L. ^{[1
]}

Bonda, A. ^{[1
]}

Uba, S. ^{[1
]}

Bekenov, L. V. ^{[2
]}

Antonov, V. N. ^{[1
,2
]}

机构：

[1] Univ Bialystok, Fac Math & Informat, K Ciolkowskiego 1M, PL-15245 Bialystok, Poland

[2] Inst Met Phys, Vernadsky St, UA-03142 Kiev, Ukraine

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2017年 / 29卷 / 27期

关键词：

Heusler alloys; magnetic thin films; magneto-optical Kerr spectroscopy; ab initio calculations; electronic structure; magnetic moments; FIELD-INDUCED STRAIN; MARTENSITIC-TRANSFORMATION; MAGNETIC-PROPERTIES; CRYSTAL-STRUCTURE; NI; TRANSITION; MAGNETORESISTANCE;

D O I：

10.1088/1361-648X/aa7035

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

In this joint experimental and ab initio study, we investigated the influence of chemical composition and martensitic phase transition on the electronic, magnetic, optical and magneto-optical properties of ferromagnetic shape-memory Ni-Mn-Sn alloys. Optical properties and polar magneto-optical Kerr effect (MOKE) spectra for Ni-Mn-Sn alloy film of composition Ni54.3Mn31.9Sn13.8 deposited epitaxially on MgO(001) substrate were measured over the photon energy range 0.8 <= h nu <= 5.8 eV, and the complete set of optical conductivity tensor elements were determined. To explain the microscopic origin of the optical and magneto-optical spectra, extensive first-principles calculations were made, using the spin-polarized fully relativistic linear-muffin-tin-orbital method. The electronic, magnetic and magneto-optical properties of Ni-Mn-Sn Heusler alloys were investigated for the cubic austenitic and 4O orthorhombic martensitic phases, in stoichiometric and off-stoichiometric compositions. The MOKE properties of Ni-Mn-Sn systems are very sensitive to deviation from stoichiometry. It was shown that the ab initio calculations reproduce experimental spectra well, and help to explain the microscopic origin of Ni-Mn-Sn optical and magneto-optical responses. The interband transitions responsible for the prominent structures in the Ni-Mn-Sn MOKE spectra have been identified-they come from relatively narrow energy intervals at several well-defined vicinities of high-symmetry directions of the Brillouin zone. Significant modification of the MOKE spectra can be considered as a fingerprint of martensitic phase transition in Ni-Mn-Sn alloys.

引用

页数：10

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