2017年第64回応用物理学会春季学術講演会

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一般セッション(口頭講演)

10 スピントロニクス・マグネティクス » 10.1 新物質・新機能創成(作製・評価技術)

[17a-501-1~12] 10.1 新物質・新機能創成(作製・評価技術)

10.1と10.2と10.3と10.4のコードシェアセッションあり

2017年3月17日(金) 09:00 〜 12:15 501 (501)

柳原 英人(筑波大)、三浦 良雄(京都工繊大)

10:00 〜 10:15

[17a-501-5] Electronic structure and magnetic properties of magnetic dead layers in epitaxial CoFe2O4/Al2O3/Si(111) films studied by X-ray magnetic circular dichroism (XMCD)

若林 勇希1、野中 洋亮2、竹田 幸治3、祥哉 坂本2、啓祐 池田2、池 震棟2、芝田 悟朗2、斎藤 祐児3、山上 浩志3,4、田中 雅明1、藤森 淳2、中根 了昌1 (1.東大工、2.東大理、3.原研、4.京産大)

キーワード:XMCD, oxide films, spintronics

The spin filter effect through a CoFe2O4 tunnel barrier has a potential ability for generating a highly spin-polarized electron current. Nevertheless, the experimental spin-polarization value estimated from tunnel magnetoresistance has been much less than expectation [1, 2], and many researchers have begun to point out the degradation of the electronic structure and magnetism due to spontaneously-formed structural disorder. It is plausible from the general recognition that magnetic dead layers formed at heterointerfaces cause to degrade ferrimagnetic ordering further with decreasing thickness, however, the magnetism of CoFe2O4 layers with various thicknesses have not yet systematically investigated. In this study, we present the electronic structure and magnetic properties of CoFe2O4(111) layers with various thicknesses using XAS and XMCD.