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Enhancement of spin-orbit torque efficiency by tailoring interfacial spin-orbit coupling in Pt-based magnetic multilayers

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Chinese Physics B 2022年第9期31卷 146-151页

作者：王文强朱耿宽周恺元战翔陶醉付清为梁力克李子爽陈丽娜晏春杰李浩天周铁军刘荣华 National Laboratory of Solid State Microstructures School of Physics and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China New Energy Technology Engineering Laboratory of Jiangsu Provence and School of Science Nanjing University of Posts and TelecommunicationsNanjing 210023China Centre for Integrated spintronic Devices School of Electronics and InformationHangzhou Dianzi UniversityHangzhou 310018China

We study inserting Co layer thickness-dependent spin transport and spin-orbit torques(SOTs)in the Pt/Co/Py trilayers by spin-torque ferromagnetic *** interfacial perpendicular magnetic anisotropy(IPMA)energy density(Ks=2.7 erg/cm^(2),1 erg=10^(-7) J),which is dominated by interfacial spin-orbit coupling(ISOC)in the Pt/Co interface,total effective spin-mixing conductance(G↑↓eff,tot=0.42×10^(15) Ω^(-1)·m^(-2))and two-magnon scattering(βTMS=0.46 nm2)are first characterized,and the damping-like torque(ξDL=0.103)and field-like torque(ξFL=-0.017)efficiencies are also calculated quantitatively by varying the thickness of the inserting Co *** significant enhancement of ξDL and ξFL in Pt/Co/Py than Pt/Py bilayer system originates from the interfacial Rashba-Edelstein effect due to the strong ISOC between Co-3d and Pt-5d orbitals at the Pt/Co ***,we find a considerable out-of-plane spin polarization SOT,which is ascribed to the spin anomalous Hall effect and possible spin precession effect due to IPMA-induced perpendicular magnetization at the Pt/Co *** results demonstrate that the ISOC of the Pt/Co interface plays a vital role in spin transport and *** finds offer an alternative approach to improve the conventional SOTs efficiencies and generate unconventional SOTs with out-of-plane spin polarization to develop low power Pt-based spintronic via tailoring the Pt/FM interface.

关键词： spin-orbit torque interfacial Rashba-Edelstein effect spin-torque efficiency spin-torque ferromagnetic resonance

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Enhanced spin–orbit torque efficiency in Pt100−xNix alloy based magnetic bilayer

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Chinese Physics B 2021年第3期30卷 100-104页

作者：何聪丽陈庆强申世鹏魏晋武许洪军赵云驰于国强王守国 Institute of Advanced Materials Beijing Normal UniversityBeijing 100875China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

The binary alloy/ferromagnetic metal heterostructure has drawn extensive attention in the research field of spin–orbittorque(SOT)due to the potential enhancement of SOT efficiency via composition *** this work,the magneticproperties and SOT efficiency in the Pt100−xNix/Ni78Fe22 bilayers were investigated via the spin-torque ferromagneticresonance(ST-FMR)*** effective magnetic anisotropy field and effective damping constant extracted by analyzing the ST-FMR spectra show a weak dependence on the Ni *** effective spin-mixing conductanceof 8.40×10^(14)Ω−1·m−2and the interfacial spin transparency Tin of 0.59 were obtained for the sample of Pt70Ni30/*** interestingly,the SOT efficiency that is carefully extracted from the angular dependence of ST-FMR spectrashows a nonmonotonic dependence on the Ni concentration,which reaches the maximum at x=*** enhancement ofthe SOT efficiency by alloying the Ni with Pt shows potential in lowering the critical switching ***,alloyingrelatively cheaper Ni with Pt may promote to reduce the cost of SOT devices.

关键词： spin-orbit torque magnetic doping spin-torque ferromagnetic resonance

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