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Exchange magnon induced resistance asymmetry in permalloy spin-Hall oscillators (1602.06710v1)
Published 22 Feb 2016 in cond-mat.mes-hall and cond-mat.mtrl-sci
Abstract: We investigate magnetization dynamics in a spin-Hall oscillator using a direct current measurement as well as conventional microwave spectrum analysis. When the current applies an anti-damping spin-transfer torque, we observe a change in resistance which we ascribe to the excitation of incoherent exchange magnons. A simple model is developed based on the reduction of the effective saturation magnetization, quantitatively explaining the data. The observed phenomena highlight the importance of exchange magnons on the operation of spin-Hall oscillators.
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