Gilbert damping and critical real-space trajectory of L1(0)-ordered FePt films investigated by magnetic-field-induction and all-optical methods
- Title
- Gilbert damping and critical real-space trajectory of L1(0)-ordered FePt films investigated by magnetic-field-induction and all-optical methods
- Author(s)
- Lee, Kyeong-Dong ; Song, Hyon-Seok ; Kim, Ji-Wan ; Ko, Hyun Seok ; Sohn, Jeong-Woo ; Park, Byong-Guk ; Shin, Sung-Chul
- Issued Date
- 2014-11
- Citation
- Applied Physics Express, v.7, no.11, pp.113004
- Type
- Article
- Keywords
- ULTRAFAST SPIN DYNAMICS ; NANOPARTICLES ; MICROSCOPY ; REVERSAL
- ISSN
- 1882-0778
- Abstract
- 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
- Publisher
- Institute of Physics Publishing
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- Appears in Collections:
- Department of Physics and Chemistry ETC 1. Journal Articles
- ETC 1. Journal Articles
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