期刊
PHYSICAL REVIEW B
卷 82, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.140401
关键词
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资金
- National Research Laboratory Program [R0A-2007-000-20026-0]
- WCU (World Class University) [R33-2008-000-10078-0]
- Ministry of Education, Science and Technology [K20702000014-08E0200-01410]
- Donghwa Sanup Scholarship Foundation
- National Research Foundation of Korea [R0A-2007-000-20026-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Spin precessions in the stripes of alpha-MnAs films prepared on GaAs(001) are investigated using an all-optical pump-probe method. We find that a large-angle spin precession appears while the stripe width decreases. In addition, the large-angle precession considerably changes the resonance frequency, resulting in a significant decrease in the relaxation time. These changes in the precessional motion are mainly ascribed to the dephasing of the nonuniform spin waves existing at the large-angle precession, as experimentally confirmed by varying the precession angle via tuning pump fluence. Micromagnetic simulations using a single Gilbert damping constant well predict the experimental observations, which verifies the interpretation of the change in the precessional motion.
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