Roles of Joule heating and spin-orbit torques in the direct current induced magnetization reversal

Scientific Reports
Dong LiLi Xi

Abstract

Current-induced magnetization reversal via spin-orbit torques (SOTs) has been intensively studied in heavy-metal/ferromagnetic-metal/oxide heterostructures due to its promising application in low-energy consumption logic and memory devices. Here, we systematically study the function of Joule heating and SOTs in the current-induced magnetization reversal using Pt/Co/SmOx and Pt/Co/AlOx structures with different perpendicular magnetic anisotropies (PMAs). The SOT-induced effective fields, anisotropy field, switching field and switching current density (Jc) are characterized using electric transport measurements based on the anomalous Hall effect and polar magneto-optical Kerr effect (MOKE). The results show that the current-generated Joule heating plays an assisted role in the reversal process by reducing switching field and enhancing SOT efficiency. The out-of-plane component of the damping-like-SOT effective field is responsible for the magnetization reversal. The obtained Jc for Pt/Co/SmOx and Pt/Co/AlOx structures with similar spin Hall angles and different PMAs remains roughly constant, revealing that the coherent switching model cannot fully explain the current-induced magnetization reversal. In contrast, by observing the d...Continue Reading

References

Jan 12, 2010·Nature Materials·Ioan Mihai MironPietro Gambardella
Apr 24, 2012·Nature Materials·Tomas JungwirthKamil Olejník
Sep 26, 2012·Physical Review Letters·J TorrejonM Hehn
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Feb 26, 2016·Nature Communications·Kai-Uwe DemasiusStuart S P Parkin

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