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Magnetic domains in epitaxial Fe/GaAs micro-patterned wires U. Ebels,a)

Summary: Magnetic domains in epitaxial Fe/GaAs micro-patterned wires
U. Ebels,a)
A. O. Adeyeye, M. Gester,b)
C. Daboo, R. P. Cowburn, and J. A. C. Bland
Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 OHE, United Kingdom
The magnetic domain evolution during the magnetization reversal in in-plane magnetized epitaxial
Fe/GaAs 001 wire elements with dimensions of 15 m width 500 m length 300 thickness
has been studied using a scanning Kerr microscope. The two jump switching processes,
characteristic of the magnetization reversal in continuous epitaxial Fe 001 films with four-fold
in-plane anisotropy, are observed. However, the domain nucleation and growth processes which
mediate the discontinuous and irreversible magnetization switching at the two critical reverse fields
Hc1 and Hc2 are different from those in the continuous film. They are found to be determined by the
orientation of the applied field with respect to the short and the long wire axis and hence are
``shape''-anisotropic. This shape-anisotropy is a combined local dipolar field and anisotropic finite
size effect, allowing the growth of domains only from the long/short wire axis and the propagation
of domains only in direction of the short/long wire axis respectively according to the applied field
direction. 1997 American Institute of Physics. S0021-8979 97 58908-0
The understanding of the magnetization reversal pro-
cesses in magnetic materials and the accompanying domain


Source: Adeyeye, Adekunle - Department of Electrical and Computer Engineering, National University of Singapore


Collections: Physics; Materials Science