Magnetic proximity effect in Pt/CoFe2O4 bilayers

被引：40

作者：

Amamou, Walid ^{[1
]}

Pinchuk, Igor V. ^{[2
]}

Trout, Amanda H. ^{[3
,4
]}

Williams, Robert E. A. ^{[3
]}

Antolin, Nikolas ^{[4
]}

Goad, Adam ^{[2
,5
]}

O'Hara, Dante J. ^{[1
]}

Ahmed, Adam S. ^{[2
]}

Windl, Wolfgang ^{[4
]}

McComb, David W. ^{[3
,4
]}

Kawakami, Roland K. ^{[1
,2
]}

机构：

[1] Univ Calif Riverside, Mat Sci & Engn, Riverside, CA 92521 USA

[2] Ohio State Univ, Dept Phys, 174 W 18th Ave, Columbus, OH 43210 USA

[3] Ohio State Univ, Ctr Electron Microscopy & Anal, Columbus, OH 43210 USA

[4] Ohio State Univ, Dept Mat Sci & Engn, 116 W 19Th Ave, Columbus, OH 43210 USA

[5] Univ Maryland Baltimore Cty, Dept Phys, Baltimore, MD 21250 USA

来源：

PHYSICAL REVIEW MATERIALS | 2018年 / 2卷 / 01期

关键词：

FIELD;

D O I：

10.1103/PhysRevMaterials.2.011401

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We observe the magnetic proximity effect (MPE) in Pt/CoFe2O4 bilayers grown by molecular beam epitaxy. This is revealed through angle-dependent magnetoresistance measurements at 5K, which isolate the contributions of induced ferromagnetism (i.e., anisotropic magnetoresistance) and the spin Hall effect (i.e., the spin Hall magnetoresistance) in the Pt layer. The strong evidence for induced ferromagnetism in Pt via the anisotropic magnetoresistance is supported further by density functional theory calculations and various control measurements including the insertion of a Cu spacer layer to suppress the induced ferromagnetism. In addition, anomalous Hall effect measurements show an out-of-plane magnetic hysteresis loop of the induced ferromagnetic phase with larger coercivity and larger remanence than the bulk CoFe2O4. By demonstrating the MPE in Pt/CoFe2O4, these results establish the spinel ferrite family as a promising material for the MPE and spin manipulation via proximity exchange fields.

引用

页数：5

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