Nonlinear longitudinal and transverse magnetoresistances due to current-induced magnon creation-annihilation processes

Abstract

Charge-spin conversion phenomena such as the spin Hall effect allow for the excitation of magnons in a magnetic layer by passing an electric current in an adjacent nonmagnetic conductor. We demonstrate that this current-induced modification of the magnon density generates an additional nonlinear longitudinal and transverse magnetoresistance for every magnetoresistance that depends on the magnetization. Using harmonic measurements, we evidence that these magnon creation-annihilation magnetoresistances dominate the second harmonic longitudinal and transverse resistance of thin Y${}_3$Fe${}_5$O${}_{12}$/Pt bilayers. Our results apply to both insulating and metallic magnetic layers, elucidating the dependence of the magnetoresistance on applied current and magnetic field for a broad variety of systems excited by spin currents.

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Cited by in corpus (5)

• Estimation of spin-orbit torques in the presence of current-induced magnon creation and annihilation
• Current-Controlled Magnon-Magnon Coupling in an On-Chip Cavity Resonator
• Coherent and Dissipative Spin Torques in Quantum Dots: A Unified Framework for Quantum Spin Dynamics
• Charge-to-spin conversion in epitaxial and polycrystalline Bi and Bi/Ag layers
• Roles of Electron-Magnon Cross Diffusion in Unidirectional Magnetoresistance of Metallic Magnetic Bilayers