Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 321, Issue 14, Pages 2187-2191Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2009.01.030
Keywords
Coercivity; FePt; Hysteresis; Domain wall; Pinning
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FePt thin layers have been epitaxied either on Pt(001) or on MgO(001) substrates, and magnetically characterized using extraordinary Hall effect magnetometry and magnetic force microscopy. The coercivity originates in both cases from the pinning of domain walls on structural defects. Whereas the coercivity increases with the FePt layer thickness in FePt/Pt samples, it decreases in FePt/MgO samples. This discrepancy is explained on the basis of structural observations, and of atomistic simulations of magnetic domain wall pinning. (C) 2009 Elsevier B.V. All rights reserved.
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