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• W3100679366 abstract "The spin Hall effect in a heavy metal thin film allows to probe the magnetic properties of an adjacent magnetic insulator via magnetotransport measurements. Here, we investigate the magnetoresistive response of yttrium iron garnet/platinum heterostructures from room temperature to beyond the Curie temperature $T_mathrm{C, YIG} approx 560,mathrm{K}$ of the ferrimagnetic insulator. We find that the amplitude of the (local) spin Hall magnetoresistance decreases monotonically from $300,mathrm{K}$ towards $T_mathrm{C}$, mimicking the evolution of the saturation magnetization of yttrium iron garnet. Interestingly, the spin Hall magnetoresistance vanishes around $500,mathrm{K}$, well below $T_mathrm{C}$, which we attribute to the formation of a parasitic interface layer by interdiffusion. Around room temperature the non-local magnon-mediated magnetoresistance exhibits a power law scaling $T^{alpha}$ with $alpha = 3/2$, as already reported. The exponent decreases gradually to $alpha sim 1/2$ at around $420,mathrm{K}$, before the non-local magnetoresistance vanishes rapidly at a similar temperature as the spin Hall magnetoresistance. We attribute the reduced $alpha$ at high temperatures to the increasing thermal magnon population which leads to enhanced scattering of the non-equilibrium magnon population and a reduced magnon diffusion length. Finally, we find a magnetic field independent offset voltage in the non-local signal for $T > 470,mathrm{K}$ which we associate with electronic leakage currents through the normally insulating yttrium iron garnet film. Indeed, this non-local offset voltage is thermally activated with an energy close to the band gap." @default.
• W3100679366 created "2020-11-23" @default.
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• W3100679366 date "2021-06-21" @default.
• W3100679366 modified "2023-10-18" @default.
• W3100679366 title "Nonlocal magnon-based transport in yttrium-iron-garnet–platinum heterostructures at high temperatures" @default.
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• W3100679366 doi "https://doi.org/10.1103/physrevb.103.214434" @default.
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