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Granular magnetic cobalt metal/polymer thin film system

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3 Author(s)
Jongill Hong ; Dept. of Mater. Sci. & Eng., Stanford Univ., CA, USA ; E. Kay ; S. X. Wang

Thin films consisting of granular dispersions of cobalt nano-particles in a hydrocarbon matrix are fabricated by simultaneous sputtering of cobalt and plasma induced polymerization of hydrocarbon monomers. It is confirmed that cobalt nano-particles with a hexagonal close-packed (hcp) structure are uniformly distributed throughout the amorphous hydrocarbon matrix. In-plane magnetic hysteresis loops obtained by MOKE (Magneto-Optic Kerr Effect) magnetometry measurements show significant differences between granular cobalt crystallites dispersed throughout the polymeric film matrix and cobalt crystallites in a continuous polycrystalline pure cobalt film due to the mechanism of domain boundary pinning. For the first time, the domain structures and wall motion in a cobalt/polymer system are captured in real time by Lorentz microscopy

Published in:

IEEE Transactions on Magnetics  (Volume:32 ,  Issue: 5 )