Manipulation of Spin-Torque Generation Using Ultrathin Au

Hongyu An, Satoshi Haku, Yusuke Kanno, Hiroyasu Nakayama, Hideyuki Maki, Ji Shi, Kazuya Ando

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


The generation and the manipulation of current-induced spin-orbit torques are of essential interest in spintronics. However, in spite of the vital progress in spin orbitronics, electric control of the spin-torque generation still remains elusive and challenging. We report on electric control of the spin-torque generation using ionic-liquid gating of ultrathin Au. We show that by simply depositing a SiO2 capping layer on an ultrathin-Au/Ni81Fe19 bilayer, the spin-torque generation efficiency is drastically enhanced by a maximum of 7 times. This enhancement is verified to be originated from the rough ultrathin-Au/Ni81Fe19 interface induced by the SiO2 deposition, which results in the enhancement of the interface spin-orbit scattering. We further show that the spin-torque generation efficiency from the ultrathin Au film can be reversibly manipulated by a factor of 2 using the ionic gating with an external electric field within a small range of 1 V. These results pave a way towards the efficient control of the spin-torque generation in spintronic applications.

Original languageEnglish
Article number064016
JournalPhysical Review Applied
Issue number6
Publication statusPublished - 2018 Jun 12

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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