Efficient Spin-Orbit Torque Magnetization Switching With Low Current Density in Crystalline Ferromagnetic Semiconductor

초록

We explore spin-orbit torque (SOT) magnetization switching in a crystalline (Ga,Mn)(As,P) ferromagnetic semiconductor (FMS) film exhibiting perpendicular anisotropy. The switching phenomenon is investigated using Hall resistance (HR) hysteresis observed during current-scan measurements. The chirality of magnetization switching, as reflected by HR hysteresis loops, is consistent with the SOT generated by the current-induced Rashba- and Dresselhaus-type spin-orbit fields (SOFs) in the tensile-strained (Ga,Mn)(As,P) film. The critical current exhibits a systematic reduction as the temperature increases, reaching a minimum value of J~sim ~4times 10^{3} A/cm2 at 65 K. The achievement of such low critical current density obtained by SOT magnetization switching in a single ferromagnetic layer suggests promising prospects for developing novel, energy-efficient spintronic devices. © 1965-2012 IEEE.

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