Magnon Planar Hall Effect and Anisotropic Magnetoresistance in a Magnetic Insulator

Abstract

Electrical resistivities can be different for charge currents travelling parallel or perpendicular to the magnetization in magnetically ordered conductors or semiconductors, resulting in the well-known planar Hall effect and anisotropic magnetoresistance. Here, we study the analogous anisotropic magnetotransport behavior for magnons in a magnetic insulator Y${}_3$Fe${}_5$O${}_{12}$. Electrical and thermal magnon injection, and electrical detection methods are used at room temperature with transverse and longitudinal geometries to measure the magnon planar Hall effect and anisotropic magnetoresistance, respectively. We observe that the relative difference between magnon current conductivities parallel and perpendicular to the magnetization, with respect to the average magnon conductivity, i.e. $|({\sigma }_{\parallel }^{\text{m}}-{\sigma }_{\perp }^{\text{m}})/{\sigma }_0^{\text{m}}|$ , is approximately 5% with the majority of the measured devices showing ${\sigma }_{\perp }^{\text{m}}>{\sigma }_{\parallel }^{\text{m}}$.

18 pages, 16 figures

References in corpus (4)

• Magnon Mediated Electric Current Drag Across a Ferromagnetic Insulator Layer
• Simultaneous detection of the spin-Hall magnetoresistance and the spin-Seebeck effect in Platinum and Tantalum on Yttrium Iron Garnet
• Temperature dependence of the magnon spin diffusion length and magnon spin conductivity in the magnetic insulator yttrium iron garnet
• Influence of yttrium iron garnet thickness and heater opacity on the nonlocal transport of electrically and thermally excited magnons

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• Electrical properties of single crystal Yttrium Iron Garnet ultra-thin films at high temperatures
• Pure spin currents in magnetically ordered insulator/normal metal heterostructures
• Enhanced magnon spin transport in NiFe${}_2$O${}_4$ thin films on a lattice-matched substrate
• Topological thermal Hall effect driven by fluctuation of spin chirality in frustrated antiferromagnets
• Laser control of magnonic topological phases in antiferromagnets
• Nonlocal magnon spin transport in yttrium iron garnet with tantalum and platinum spin injection/detection electrodes
• Tuning the diffusion of magnon in Y3Fe5O12 by light excitation
• Microwave control of thermal magnon spin transport
• Theory for electrical detection of the magnon Hall effect induced by dipolar interactions
• Thermal transport properties and some hydrodynamic-like behavior in 3D topological semimetal ZrTe5
• Intrinsic thermal Hall effect of optical phonons enhanced by discrete rotational symmetry