Ab initio prediction of giant magnetostriction and spin-reorientation in strained Au/FeCo/MgO heterostructure

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:400

Article; Proceedings Paper

Ong, P. V.¹  Kioussis, Nicholas¹ 

[1] Calif State Univ Northridge, Dept Phys & Astron, Northridge, CA 91330 USA

关键词: Ab initio calculation;    Magnetic anisotropy;    Spin-orbit coupling;    Epitaxial strain;    Magnetostriction coefficient;   

DOI  :  10.1016/j.jmmm.2015.07.065

来源: Elsevier

【 摘 要 】

Employing ab initio electronic structure calculations we have investigated the magnetostrictive properties and the effect of epitaxial strain on the magnetic anisotropy (MA) of Au/FeCo/MgO heterostructure. Under small expansive strain on the FeCo layer the system exhibits an in-plane MA. The calculations reveal that the strain dependence of the MA is nonlinear and that the FeCo film undergoes a spin re-orientation at a critical strain between 2 and 4%. The underlying mechanism is the strain-induced shift of the spin-orbit coupled d-states of the Fe atoms. We predict a giant magnetostriction coefficient of about 420 x 10(-6) in the heterostructure. Published by Elsevier B.V.

【 授权许可】

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