We investigate the spectral characteristics of a spin torque oscillator (STO) excited by the spin Hall-induced spin current. We observe that the modest spin current injection triggers the conventional single peak oscillating behavior of the STO. As the spin current is further increased to enter the non-linear regime, we find the transition of the spectrum from a single peak to a multipeak structure whose frequency spacing is constant. This behavior can be primarily explained by the extremely broadened peak of the STO, which is accompanied by the frequency-dependent filtering by the transmission line. To explain the observation more quantitatively, we also discuss that the multipeak may reflect the characteristics of the intrinsic dynamics of the STO in the non-linear regime.
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13 July 2020
Research Article|
July 14 2020
Generation of multipeak spectrum of spin torque oscillator in non-linear regime
Shuichi Iwakiri
;
Shuichi Iwakiri
a)
1
Department of Physics, Graduate School of Science, Osaka University
, 1-1 Machikaneyamacho, Osaka 560-0043, Japan
a)Author to whom correspondence should be addressed: shuichi@meso.phys.sci.osaka-u.ac.jp
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Satoshi Sugimoto
;
Satoshi Sugimoto
2
Research Center for Magnetic and Spintronic Materials, National Institute for Materials Science (NIMS)
, 1-2-1 Sengen, Tsukuba 305-0047, Japan
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Yasuhiro Niimi
;
Yasuhiro Niimi
1
Department of Physics, Graduate School of Science, Osaka University
, 1-1 Machikaneyamacho, Osaka 560-0043, Japan
3
Center for Spintronics Research Network (CSRN), Graduate School of Engineering Science, Osaka University
, 1-3 Machikaneyamacho, Osaka 560-8531, Japan
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Kensuke Kobayashi
;
Kensuke Kobayashi
1
Department of Physics, Graduate School of Science, Osaka University
, 1-1 Machikaneyamacho, Osaka 560-0043, Japan
4
Institute for Physics of Intelligence and Department of Physics, The University of Tokyo
, 7-3-1 Hongo, Tokyo 113-0033, Japan
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Yusuke Kozuka
;
Yusuke Kozuka
2
Research Center for Magnetic and Spintronic Materials, National Institute for Materials Science (NIMS)
, 1-2-1 Sengen, Tsukuba 305-0047, Japan
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Yukiko K. Takahashi
;
Yukiko K. Takahashi
2
Research Center for Magnetic and Spintronic Materials, National Institute for Materials Science (NIMS)
, 1-2-1 Sengen, Tsukuba 305-0047, Japan
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Shinya Kasai
Shinya Kasai
2
Research Center for Magnetic and Spintronic Materials, National Institute for Materials Science (NIMS)
, 1-2-1 Sengen, Tsukuba 305-0047, Japan
5
JST, PRESTO
, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
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a)Author to whom correspondence should be addressed: shuichi@meso.phys.sci.osaka-u.ac.jp
Appl. Phys. Lett. 117, 022406 (2020)
Article history
Received:
May 08 2020
Accepted:
June 25 2020
Citation
Shuichi Iwakiri, Satoshi Sugimoto, Yasuhiro Niimi, Kensuke Kobayashi, Yusuke Kozuka, Yukiko K. Takahashi, Shinya Kasai; Generation of multipeak spectrum of spin torque oscillator in non-linear regime. Appl. Phys. Lett. 13 July 2020; 117 (2): 022406. https://doi.org/10.1063/5.0013102
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