All electrical manipulation of magnetization dynamics in a ferromagnet by antiferromagnets with anisotropic spin Hall effects

Abstract

We investigate spin-orbit torques of metallic CuAu-I-type antiferromagnets using spin-torque ferromagnetic resonance tuned by a dc-bias current. The observed spin torques predominantly arise from diffusive transport of spin current generated by the spin Hall effect. We find a growth-orientation dependence of the spin torques by studying epitaxial samples, which may be correlated to the anisotropy of the spin Hall effect. The observed anisotropy is consistent with first-principles calculations on the intrinsic spin Hall effect. Our work demonstrates large tunable spin-orbit effects in magnetically-ordered materials.

7 pages, 6 figures, to appear in Phys. Rev. B (2015)

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• Concepts of antiferromagnetic spintronics
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• Giant anisotropy of Gilbert damping in epitaxial CoFe films
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• Strong Spin Hall Effect in the Antiferromagnet PtMn
• Perspective on Metallic Antiferromagnets
• Principles of spintronic THz emitters
• Magnetic asymmetry induced anomalous spin-orbit torque in IrMn
• Driving and detecting ferromagnetic resonance in insulators with the spin Hall effect
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• Anomalous Hall effect and spin orbit torques in MnGa/IrMn films: Modification from strong spin Hall effect of antiferromagnet
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• Field-free perpendicular magnetization switching through domain wall motion in Pt/Co/Cr racetracks by spin orbit torques with the assistance of accompanying Joule heating effect
• Lead-free Hybrid Perovskite: An Efficient Room Temperature Spin Generator via Large Interfacial Rashba effect
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• Ferromagnetic resonance phase imaging in spin Hall multilayers
• Spin-orbit-torque MRAM: from uniaxial to unidirectional switching
• Spin-transport, spin-torque and memory in antiferromagnetic devices: Part of a collection of reviews on antiferromagnetic spintronics
• Probing anisotropy in epitaxial Fe/Pt bilayers by spin-orbit torque ferromagnetic resonance