Spin-torque generator engineered by natural oxidation of Cu

Hongyu An, Yuito Kageyama, Yusuke Kanno, Nagisa Enishi, Kazuya Ando

Research output: Contribution to journalArticle

37 Citations (Scopus)

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.

Original languageEnglish
Article number13069
JournalNature Communications
Volume7
DOIs
Publication statusPublished - 2016 Oct 11

Fingerprint

Spin Hall effect
Torque
torque
generators
Oxidation
oxidation
Orbit
Heavy Metals
Light Metals
Magnetization
Orbits
Magnetoelectronics
Ferromagnetic materials
Hall effect
heavy metals
Tuning
Metals
Oxygen
Equipment and Supplies
orbits

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Spin-torque generator engineered by natural oxidation of Cu. / An, Hongyu; Kageyama, Yuito; Kanno, Yusuke; Enishi, Nagisa; Ando, Kazuya.

In: Nature Communications, Vol. 7, 13069, 11.10.2016.

Research output: Contribution to journalArticle

An, Hongyu ; Kageyama, Yuito ; Kanno, Yusuke ; Enishi, Nagisa ; Ando, Kazuya. / Spin-torque generator engineered by natural oxidation of Cu. In: Nature Communications. 2016 ; Vol. 7.
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