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Observation of domain expansion and contraction in TbFe films by Lorentz microscopy

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2 Author(s)
Lin, C.J. ; IBM Almaden Res. Center, San Jose, CA, USA ; Rugar, D.

Lorentz electron microscopy techniques have been used to study in situ, at room temperature, the expansion and contraction of thermomagnetically written circular domains in Tb19Fe81 and Tb32Fe68 films. Domains expand or contract more or less radially in Tb19Fe81, but with the development of jagged walls. In Tb32Fe68, dendritelike stripe domains with jagged walls form either outside or within the existing domains, leaving the perimeter of the initial circular domains unchanged. The difference in behavior can be understood in terms of the difference in the importance of the local demagnetizing field relative to the local total field. The implications of the nonuniform wall motion for the appearance of domain irregularity during thermomagnetic recording are discussed

Published in:

Magnetics, IEEE Transactions on  (Volume:24 ,  Issue: 6 )

Date of Publication:

Nov 1988

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