Spin-torque generator engineered by natural oxidation of Cu

被引：154

作者：

An, Hongyu ^{[1
]}

Kageyama, Yuito ^{[1
]}

Kanno, Yusuke ^{[1
]}

Enishi, Nagisa ^{[1
]}

Ando, Kazuya ^{[1
,2
]}

机构：

[1] Keio Univ, Dept Appl Phys & Physicoinformat, 3-14-1 Hiyoshi, Yokohama, Kanagawa 2238522, Japan

[2] Japan Sci & Technol Agcy, PRESTO, Kawaguchi, Saitama 3320012, Japan

来源：

NATURE COMMUNICATIONS | 2016年 / 7卷

关键词：

ROOM-TEMPERATURE; CONVERSION;

D O I：

10.1038/ncomms13069

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The spin Hall effect is a spin-orbit coupling phenomenon, which enables electric generation and detection of spin currents. This relativistic effect provides a way for realizing efficient spintronic devices based on electric manipulation of magnetization through spin torque. However, it has been believed that heavy metals are indispensable for the spin-torque generation. Here we show that the spin Hall effect in Cu, a light metal with weak spin-orbit coupling, is significantly enhanced through natural oxidation. We demonstrate that the spin-torque generation efficiency of a Cu/Ni81Fe19 bilayer is enhanced by over two orders of magnitude by tuning the surface oxidation, reaching the efficiency of Pt/ferromagnetic metal bilayers. This finding illustrates a crucial role of oxidation in the spin Hall effect, opening a route for engineering the spin-torque generator by oxygen control and manipulating magnetization without using heavy metals.

引用

页数：8

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