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Gilbert damping and critical real-space trajectory of L1(0)-ordered FePt films investigated by magnetic-field-induction and all-optical methods
- Gilbert damping and critical real-space trajectory of L1(0)-ordered FePt films investigated by magnetic-field-induction and all-optical methods
- Lee, KD[Lee, Kyeong-Dong]; Song, HS[Song, Hyon-Seok]; Kim, JW[Kim, Ji-Wan]; Ko, HS[Ko, Hyun Seok]; Sohn, JW[Sohn, Jeong-Woo]; Park, BG[Park, Byong-Guk]; Shin, SC[Shin, Sung-Chul]
- DGIST Authors
- Song, HS[Song, Hyon-Seok]; Sohn, JW[Sohn, Jeong-Woo]; Shin, SC[Shin, Sung-Chul]
- Issue Date
- Applied Physics Express, 7(11)
- Article Type
- Anisotropy; Damping; Damping Constants; Effective Anisotropy; Gilbert Damping; Landau-Lifshitz-Gilbert; Laser Induced; Magnetization Dynamics; Optical Methods; Real-Space Trajectories; Space Flight; Trajectories
- The magnetization dynamics of perpendicularly magnetized FePt films is studied using both magnetic-field-induction and all-optical methods. A critically damped trajectory was observed in this system, where the precession ended within subnanoseconds after a single large oscillation. Using the Landau-Lifshitz-Gilbert (LLG) calculation with an experimental configuration, the effective anisotropy and damping constant were obtained. A damping constant of approximately 0.2 was determined after both a magnetic field and a laser pulse were used. The laser-induced real-space trajectory was well explained by the modified LLG calculation taking into account the demagnetization and time-dependent anisotropy. © 2014 The Japan Society of Applied Physics
- Institute of Physics Publishing
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