Journal
APPLIED PHYSICS LETTERS
Volume 93, Issue 16, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3007977
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Funding
- National Science Foundation of China [50625102, 10574026, 50871030, 60490290]
- National Basic Research Program of China [2007CB925104, 2009CB929201]
- 973 Project [2006CB921300]
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Ultrafast spin dynamics has for the first time been studied in perpendicular magnetized granular films. For FePt continuous films and FePt-MgO and FePt-Ag granular films with femtosecond laser excitations, the coercivity H-C and the saturation Kerr rotation theta(KS) are dramatically reduced, accompanied by a sharp increase in the reflectivity R. Afterward, these physical quantities are slowly recovered. The changes in H-C, theta(KS), and R are all different among FePt, FePt-MgO, and FePt-Ag films. The difference is caused by different film thicknesses and in particular by the surface plasmon resonance of metallic nanoparticles. (C) 2008 American Institute of Physics. [DOI: 10.1063/1.3007977]
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