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Spin-torque generator engineered by natural oxidation of Cu.

ABSTRACT: 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.

SUBMITTER: An H

PROVIDER: S-EPMC5062613 | biostudies-literature | 2016 Oct

REPOSITORIES: biostudies-literature

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Spin-torque generator engineered by natural oxidation of Cu.

An Hongyu H Kageyama Yuito Y Kanno Yusuke Y Enishi Nagisa N Ando Kazuya K

Nature communications 20161011

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 n ...[more]

PMID: 27725654

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