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Comment on ”Detection of Microwave Spin Pumping Using the Inverse Spin Hall Effect”



Thomas J. Silva, Mathias A. Weiler, Hans T. Nembach, Justin M. Shaw


In a recent Letter, Hahn et al. reported on the detection of an ac voltage in a yttrium iron garnet (YIG)/platinum (Pt) bilayer under the condition of parametrically excited resonance. The authors observe an ac voltage at the frequency of the magnetization precession which is half the frequency of the microwave excitation. As argued by the authors, this parametric excitation scheme allows them to exclude direct microwave crosstalk as the origin of the ac voltage. However, the authors do not address the possibility of an inductive origin of the observed ac voltage VISHE(ac). A resonant, inductive signal arises as a consequence of Faraday’s law at the magnetization precession frequency and is routinely exploited in, e.g., stripline or vector network analyzer ferromagnetic resonance experiments. Such an inductive signal arises from the threading of the time-varying magnetic flux originating in the YIG film around the Pt stripe.
Physical Review Letters


spin Hall effect, Faraday's law


Silva, T. , Weiler, M. , Nembach, H. and Shaw, J. (2014), Comment on ”Detection of Microwave Spin Pumping Using the Inverse Spin Hall Effect”, Physical Review Letters, [online], (Accessed April 21, 2024)
Created January 27, 2014, Updated February 19, 2017