Dependences of the activation volumes on Ar sputtering pressure in Co/Pt multilayers prepared by dc magnetron sputtering

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We investigated the wall-motion and nucleation activation volumes of Co/Pt multilayer films prepared by dc magnetron sputtering under various Ar sputtering pressures. Delicate analysis of time-resolved domain evolution patterns reveals that the nucleation activation volume is generally smaller than the wall-motion activation volume in all the samples, which is consistent with the nucleation-dominant magnetization reversal behavior observed in this system. Interestingly, the activation volume is found to decrease with increasing Ar pressure, despite a decreasing trend in saturation magnetization. Decreasing grain size with increasing Ar pressure, smaller than the typical size of a Co single domain, is believed to be the origin of the unexpected observation. (C) 2002 American Institute of Physics.
Publisher
AMER INST PHYSICS
Issue Date
2002-01
Language
English
Article Type
Article
Keywords

ULTRATHIN FERROMAGNETIC-FILMS; MAGNETIZATION REVERSAL; PERPENDICULAR ANISOTROPY; DOMAIN; DYNAMICS

Citation

APPLIED PHYSICS LETTERS, v.80, no.3, pp.452 - 454

ISSN
0003-6951
URI
http://hdl.handle.net/10203/13867
Appears in Collection
RIMS Journal Papers
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