Reversal of current-induced domain wall motion in TbFeCo ferrimagnetic thin films across the magnetization compensation point

Author:

Ishibashi Mio,Yakushiji Kay,Kawaguchi Masashi,Tsukamoto Arata,Nakatsuji SatoruORCID,Hayashi MasamitsuORCID

Abstract

Abstract We report on a systematic investigation of current-induced domain wall motion in TbFeCo ferrimagnetic thin films with a Pt underlayer. The Tb concentration of the alloy is varied to study the effect of the magnetization compensation on the current-induced motion of domain walls. We find that the direction in which domain walls move changes when the Tb concentration crosses the magnetization compensation point. Interestingly, the domain walls move along (against) the current flow for FeCo-rich (deficient) films. When the film composition is slightly Tb-rich than the magnetic compensation point, the domain wall moves along the current at a lower current but reverses its direction when the current is increased. These results suggest that two competing torques act on the domain walls in the Tb-based ferrimagnets (TbFeCo), causing the domain wall velocity to be more than one order of magnitude smaller than that of Gd-based ferrimagnets.

Funder

Japan Science and Technology Agency

Publisher

IOP Publishing

Subject

General Physics and Astronomy,General Engineering

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