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Journal Articles

Acoustic spin pumping; Direct generation of spin currents from sound waves in Pt/Y$$_{3}$$Fe$$_{5}$$O$$_{12}$$ hybrid structures

Uchida, Kenichi*; Adachi, Hiroto; An, Toshu*; Nakayama, Hiroyasu*; Toda, Masaya*; Hillebrands, B.*; Maekawa, Sadamichi; Saito, Eiji

Journal of Applied Physics, 111(5), p.053903_1 - 053903_8, 2012/03

https://doi.org/10.1063/1.3688332
 Times Cited Count：29 Percentile：71.65(Physics, Applied)

Using a Pt/Y$$_{3}$$Fe$$_{5}$$O$$_{12}$$ (YIG) hybrid structure attached to a piezoelectric actuator, we demonstrate the generation of spin currents from sound waves. This "acoustic spin pumping" is caused by the sound wave generated by the piezoelectric actuator, which then modulates the distribution function of magnons in the YIG layer and results in a pure-spin-current injection into the Pt layer across the Pt/YIG interface. In the Pt layer, this injected spin current is converted into an electric voltage due to the inverse spin-Hall effect. The ISHE induced by the acoustic spin pumping is detected by measuring a voltage in the Pt layer at the piezoelectric resonance frequency of the actuator coupled with the Pt/YIG system. Our model calculation based on the linear response theory provides us with a qualitative and quantitative understanding of the acoustic spin pumping in the Pt/YIG system.

Journal Articles

Surface-acoustic-wave-driven spin pumping in Y$$_{3}$$Fe$$_{5}$$O$$_{12}$$/Pt hybrid structure

Uchida, Kenichi*; An, Toshu*; Kajiwara, Yosuke*; Toda, Masaya*; Saito, Eiji

Applied Physics Letters, 99(21), p.212501_1 - 212501_3, 2011/11

https://doi.org/10.1063/1.3662032
 Times Cited Count：48 Percentile：84.65(Physics, Applied)

A spin current generated from a surface acoustic wave (SAW) was observed in an Y$$_{3}$$Fe$$_{5}$$O$$_{12}$$/Pt(YIG)/Pt hybrid structure. At the YIG/Pt interface, a SAW generated in the YIG layer was found to pump a spin current into the Pt layer, which was detected through the inverse spin-Hall effect in the Pt. The YIG/Pt lateral structure combined with a piezoelectric wedge transducer enables the systematic investigation of the spin-voltage distribution due to the SAW in the YIG. Since the observed phenomenon has high affinity with SAW-based electronics, it will pave the way for constructing spintronic SAW devices.

Journal Articles

Long-range spin Seebeck effect and acoustic spin pumping

Uchida, Kenichi*; Adachi, Hiroto; An, Toshu*; Ota, Takeru*; Toda, Masaya*; Hillebrands, B.*; Maekawa, Sadamichi; Saito, Eiji

Nature Materials, 10(10), p.737 - 741, 2011/10

https://doi.org/10.1038/nmat3099
 Times Cited Count：232 Percentile：98.47(Chemistry, Physical)

We show that, using a NiFe/Pt bilayer wire on an insulating sapphire plate, electrons in the wire recognize their position on the sapphire. Under a temperature gradient in the sapphire, surprisingly, the voltage generated in the Pt layer is shown to reflect the wire position, although the wire is isolated both electrically and magnetically. This non-local voltage due to the coupling of spins and phonons: the only possible carrier of information in this system. We demonstrate this coupling by directly injecting sound waves, which realizes the acoustic spin pumping. Our finding provides a persuasive answer to the long-range nature of the spin Seebeck effect, and it opens the door to "acoustic spintronics" in which sound waves are exploited for constructing spin-based devices.

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