TY - JOUR
T1 - Micro-Focused Pulse Laser-Induced Propagating Spin Waves in Permalloy Films With Different Thicknesses
AU - Kamimaki, Akira
AU - Iihama, Satoshi
AU - Sasaki, Yuta
AU - Ando, Yasuo
AU - Mizukami, Shigemi
N1 - Funding Information:
ACKNOWLEDGMENT This work was supported in part by KAKENHI under Grant 26103004, Grant 16H03846, and Grant 16K14244, in part by the Center of Spintronics Research Network, and in part by the JSPS Core-to-Core Program. The work of A. Kamimaki and Y. Sasaki was supported by the Graduate Programs of Spintronics at Tohoku University. The work of S. Iihama was supported by the Grant-in-Aid for JSPS Fellows under Grant 2-7881.
Publisher Copyright:
© 2017 IEEE.
PY - 2017/11
Y1 - 2017/11
N2 - Propagating spin waves excited by a micro-focused ultra-short pulse laser were investigated in Permalloy films with the thicknesses of 20, 50, and 100 nm by means of an all-optical space-and-time-resolved magneto-optical Kerr effect. Although various perpendicular standing spin-wave modes were excited, the propagating magneto-static surface spin wave was clearly detected in each film, where the group velocities of approximately 4, 8, and 12 km/s and the propagation lengths of 3.8, 6.6, and 13 μm for the 20, 50, and 100 nm-thick films, respectively, were evaluated. The evaluated group velocities were consistent with the theoretical values, whereas the propagation lengths were smaller than the theoretical values with the Gilbert damping constant α of 0.008.
AB - Propagating spin waves excited by a micro-focused ultra-short pulse laser were investigated in Permalloy films with the thicknesses of 20, 50, and 100 nm by means of an all-optical space-and-time-resolved magneto-optical Kerr effect. Although various perpendicular standing spin-wave modes were excited, the propagating magneto-static surface spin wave was clearly detected in each film, where the group velocities of approximately 4, 8, and 12 km/s and the propagation lengths of 3.8, 6.6, and 13 μm for the 20, 50, and 100 nm-thick films, respectively, were evaluated. The evaluated group velocities were consistent with the theoretical values, whereas the propagation lengths were smaller than the theoretical values with the Gilbert damping constant α of 0.008.
KW - Magneto-static surface wave (MSSW)
KW - propagating spin wave (PSW)
KW - space-and-time-resolved magneto-optical Kerr effect (STR-MOKE)
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U2 - 10.1109/TMAG.2017.2707421
DO - 10.1109/TMAG.2017.2707421
M3 - Article
AN - SCOPUS:85032937912
SN - 0018-9464
VL - 53
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
IS - 11
M1 - 7934088
ER -