Quantitative estimation of thermoelectric contributions in spin pumping signals through microwave photoresistance measurements

Spin pumping is a technique widely used to generate pure spin current and characterize the spin-charge conversion efficiency of heavy metals. Upon microwave excitation, the sample may also be heated, and the parasitic thermoelectric signals could contaminate the spin pumping results. Owing to their...

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Bibliographic Details
Published in:Physical review. B 2021-01, Vol.103 (1), p.014415, Article 014415
Main Authors: Cheng, Jun, He, Kang, Yang, Man, Liu, Qi, Yu, Rui, Sun, Liang, Ding, Jinjun, Miao, Bingfeng, Wu, Mingzhong, Ding, H. F.
Format: Article
Language:English
Subjects:
Charge efficiency
Ferromagnetism
Heavy metals
Hysteresis loops
Microwave absorption
Pumping
Quantitative analysis
Spintronics
Thermoelectricity
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Summary:Spin pumping is a technique widely used to generate pure spin current and characterize the spin-charge conversion efficiency of heavy metals. Upon microwave excitation, the sample may also be heated, and the parasitic thermoelectric signals could contaminate the spin pumping results. Owing to their identical angular dependences with respect to the magnetic field, it is difficult to isolate one from the other. In this paper, we present a quantitative method to separate thermoelectric contributions from spin pumping signals in both Py (NI80 Fe20)/Pt and YIG (Y3 Fe5 O12)/Pt bilayers through microwave photoresistance measurements. We find that the microwave absorption indeed can raise the temperature of samples, resulting a field-dependent thermoelectric hysteresis loop. However, the additional heat dissipation due to the resonant precession of the magnetization in the ferromagnet is negligibly small compared with the measured spin pumping signal. Thus, we conclude that the spin pumping signal is free of any detectable thermoelectric contributions.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.103.014415