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arXiv 1706.08473cond-mat.mtrl-sci
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Pt/CoFe2O4双层膜的磁邻近效应

Magnetic Proximity Effect in Pt/CoFe2O4 Bilayers

Walid Amamou, Igor V. Pinchuk, Amanda Hanks, Robert Williams, Nikolas Antolin, Adam Goad, Dante J. O'Hara, Adam S. Ahmed, Wolfgang Windl, David W. McComb, Roland K. Kawakami

摘要:

我们在分子束外延生长的Pt/CoFe_2 O_4双层膜中观察到了磁邻近效应(MPE)。这是通过在5 K的角度相关的磁阻测量,其中隔离的感应铁磁性(即各向异性磁阻)和自旋霍尔效应(即自旋霍尔磁阻)在Pt层的贡献。通过密度泛函理论计算和各种控制测量(包括插入Cu间隔层以抑制感生铁磁性)进一步支持通过AMR在Pt中感生铁磁性的观察。此外,反常的霍尔效应测量显示出的平面外的磁滞回线的感应铁磁相具有更大的矫顽力和更大的剩磁比散装CoFe 2 O 4。通过证明MPE在Pt/CoFe 2 O 4,这些结果建立了尖晶石铁氧体家庭作为一个有前途的材料MPE和自旋操纵通过邻近交换场。

英文摘要:

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 5 K, which isolate the contributions of induced ferromagnetism (i.e. anisotropic magnetoresistance) and spin Hall effect (i.e. spin Hall magnetoresistance) in the Pt layer. The observation of induced ferromagnetism in Pt via AMR is further supported by density functional theory calculations and various control measurements including 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 MPE in Pt/CoFe2O4, these results establish the spinel ferrite family as a promising material for MPE and spin manipulation via proximity exchange fields.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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