Observation of Vector Spin Seebeck Effect in a Noncollinear Antiferromagnet

Abstract

Spintronic phenomena to date have been established in magnets with collinear moments, where the spin injection through the spin Seebeck effect (SSE) is always along the out-of-plane direction. Here, we report the observation of a vector SSE in a noncollinear antiferromagnet (AF) LuFeO${}_3$, where temperature gradient along the out-of-plane and also the in-plane directions can both inject a pure spin current and generate a voltage in the heavy metal via the inverse spin Hall effect (ISHE). We show that the thermovoltages are due to the magnetization from canted spins in LuFeO${}_3$. Furthermore, in contrast to the challenges of generating, manipulating and detecting spin current in collinear AFs, the vector SSE in LuFeO${}_3$ is readily viable in zero magnetic field and can be controlled by a small magnetic field of about 150 Oe at room temperature. The noncollinear AFs expand new realms for exploring spin phenomena and provide a new route to low-field antiferromagnetic spin caloritronics and magnonics.

References in corpus (8)

• Theory of spin Hall magnetoresistance
• Observation of the Magnon Hall Effect
• Electrical Manipulation of a Topological Antiferromagnetic State
• Subterahertz spin pumping from an insulating antiferromagnet
• Coherent spin-wave transport in an antiferromagnet
• Direct imaging of current-induced antiferromagnetic switching revealing a pure thermomagnetoelastic switching mechanism
• Room temperature antiferromagnetic resonance and inverse spin-Hall voltage in canted antiferromagnets
• Vectorial observation of the spin Seebeck effect in epitaxial NiFe${}_2$O${}_4$ thin films with various magnetic anisotropy contributions

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• Signature of BKT-like spin transport in a quasi-2D antiferromagnet BaNi${}_2$V${}_2$O${}_8$
• Determination of superexchange interactions for the CuO${}_2$ chains in LiCu${}_2$O${}_2$
• Electrical Seebeck-Contrast Observation of Magnon Hall Effect in Topological Ferromagnet Lu${}_2$V${}_2$O${}_7$/Heavy Metal Heterostructures
• Low temperature spin Seebeck effect in non-magnetic vanadium dioxide
• Hall mass and transverse Noether spin currents in noncollinear antiferromagnets
• Amplifying the antiferromagnetic spin Seebeck effect through topological magnons
• Magnetic excitation spectrum and hierarchy of magnetic interactions in ErFeO3
• Spin Seebeck Effect in Correlated Antiferromagnetic V2O3