Controlling spin current polarization through non-collinear antiferromagnetism

Abstract

The spin-Hall effect describes the interconversion of charge currents and spin currents, enabling highly efficient manipulation of magnetization for spintronics. Symmetry conditions generally restrict polarizations of these spin currents to be orthogonal to both the charge and spin flows. Spin polarizations can deviate from such direction in nonmagnetic materials only when the crystalline symmetry is reduced11. Here we experimentally show control of the spin polarization direction by using a non-collinear antiferromagnet Mn${}_3$GaN, in which the triangular spin structure creates a low magnetic symmetry state while maintaining a high crystalline symmetry. We demonstrate that epitaxial Mn3GaN/Permalloy heterostructures can generate unique types of spinHall torques at room temperature corresponding to unconventional spin polarizations collinear to spin currents or charge currents which are forbidden in any sample with two-fold rotational symmetry. Our results demonstrate an approach based on spin-structure design for controlling spinorbit torque, paving the way for further progress in the emergent field of antiferromagnetic spintronics.

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• Noncollinear Antiferromagnetic Spintronics
• Band tilt induced nonlinear Nernst effect in topological insulators: An efficient generation of high-performance spin polarization
• Anomalous Nernst effect in Mn${}_3$NiN thin films
• Phase transitions associated with magnetic-field induced topological orbital momenta in a non-collinear antiferromagnet
• Structure, physical properties, and magnetically tunable topological phases in topological semimetal EuCuBi
• Observation of unconventional spin polarization induced spin orbit torque in L1${}_2$-ordered antiferromagnetic Mn${}_3$Pt thin films
• Effective model analysis of intrinsic spin Hall effect with magnetism in stacked-kagome Weyl semimetal Co3Sn2S2
• Coexistence of unconventional spin Hall effect and antisymmetric planar Hall effect in IrO${}_2$
• Optimization of reactively sputtered Mn3GaN films based on resistivity measurements
• Enhancing z spin generation in trivial spin Hall materials for scalable, energy-efficient, field-free, complete spin-orbit torque switching applications
• Cluster magnetic octupole induced out-of-plane spin polarization in antiperovskite antiferromagnet
• Symmetry Enhanced Unconventional Spin Current Anisotropy in a Collinear Antiferromagnet
• Enhancing Unconventional Spin-Orbit Torque Efficiency: Numerical Study on the Influence of Crystallographic Texture and Polycrystalline Effects on Low-Symmetry Materials
• Static and Dynamics of Twisted Skyrmion Tubes in Frustrated Magnets
• Intrinsic spin accumulation in the magnetic spin Hall effect
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• Direct imaging and control of Berry curvature in noncollinear antiferromagnetic single-crystal thin films