Volume 117, Number 6, March 2017
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||12 May 2017|
Unidirectional control of optically induced spin waves
1 Institute of Industrial Science, The University of Tokyo - Tokyo 153-8505, Japan
2 RIKEN Center for Advanced Photonics - Sendai 980-0845, Japan
3 Department of Physics, Kyushu University - Fukuoka 819-0395, Japan
Received: 27 February 2017
Accepted: 20 April 2017
Unidirectional control of optically induced spin waves in a rare-earth iron garnet crystal is demonstrated. We observed the interference of two spin-wave packets with different initial phases generated by circularly polarized light pulses. This interference results in unidirectional propagation if the spin-wave sources are spaced apart at 1/4 of the wavelength of the spin waves and the initial phase difference is set to . The propagating direction of the spin wave is switched by the polarization helicity of the light pulses. Moreover, in a numerical simulation, applying more than two spin-wave sources with a suitable polarization and spot shape, arbitrary manipulation of the spin wave by the phased array method was replicated.
PACS: 75.30.Ds – Spin waves / 85.70.Sq – Magnetooptical devices / 42.25.Ja – Polarization
© EPLA, 2017
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