Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 16, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3123256
Keywords
cobalt alloys; high-speed optical techniques; iron alloys; Kerr magneto-optical effect; magnetic domains; magnetic thin films; magnetisation reversal; metallic thin films; photomagnetic effect; terbium alloys; time resolved spectra
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Funding
- KAKENHI [17740204]
- Grants-in-Aid for Scientific Research [17740204] Funding Source: KAKEN
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Submicron-scale spatial feature of magnetization reversal dynamics induced by femtosecond optical pulse irradiation in a small external magnetic field was investigated by time-resolved magneto-optical Kerr microscopy on TbFeCo thin film. The magnetization reversal time near the magnetic domain boundary is dominated by an effective magnetic field generated from the peripheral domain by dipole-dipole interaction. The magnetization reversal is accelerated as high as 4.5 times (from 3.4 ns to 750 ps) when reducing the reversed domain size from 1.5 to 0.4 mu m due to concentration of dipole-dipole interaction.
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