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Generation of megahertz-band spin currents using nonlinear spin pumping

Spin pumping enables the generation of d.c. and gigahertz-band (GHz-band) voltages from an applied microwave via magnetization dynamics when combined with inverse spin Hall effects. However, generating such voltages in the in-between frequency region, or the megahertz (MHz) band, has been difficult...

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Detalles Bibliográficos
Autores principales: Watanabe, Shingo, Hirobe, Daichi, Shiomi, Yuki, Iguchi, Ryo, Daimon, Shunsuke, Kameda, Mai, Takahashi, Saburo, Saitoh, Eiji
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5496877/
https://www.ncbi.nlm.nih.gov/pubmed/28676629
http://dx.doi.org/10.1038/s41598-017-04901-4
Descripción
Sumario:Spin pumping enables the generation of d.c. and gigahertz-band (GHz-band) voltages from an applied microwave via magnetization dynamics when combined with inverse spin Hall effects. However, generating such voltages in the in-between frequency region, or the megahertz (MHz) band, has been difficult since ferromagnetic resonance usually occurs in the GHz band. Here we show that in spite of GHz-band microwaves applied, MHz-band voltages can be generated by spin pumping with use of nonlinear magnetization dynamics in Y(3)Fe(5)O(12). The mechanism is ascribed to the MHz-band oscillation of the amplitude of the magnetization precession, which is projected onto a rectified voltage component via spin pumping. The present finding could be useful for frequency down-conversion thanks to the simple and durable structure, continuous-wave operation, and the tunability of an output frequency with low magnetic fields.