Generation of megahertz-band spin currents using nonlinear spin pumping.
Sci Rep
; 7(1): 4576, 2017 07 04.
Article
in En
| MEDLINE
| ID: mdl-28676629
ABSTRACT
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 Y3Fe5O12. 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.
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01-internacional
Database:
MEDLINE
Language:
En
Journal:
Sci Rep
Year:
2017
Document type:
Article
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