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Measurements of domain‐wall energy density for amorphous rare earth–transition metal thin films

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2 Author(s)
Hajjar, R.A. ; IBM Research Division, T. J. Watson Research Center, Yorktown Heights, New York 10598 ; Shieh, H‐P.D.

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The value of domain‐wall energy density (σw) has been most often assumed to be proportional to (AxKu)1/2, where exchange stiffness (Ax) is usually calculated from the mean‐field theory. We report a simple method to derive σw from the difference between the onset of expanding and collapsing fields (ΔH) for circular domains. A micro‐Kerr hysteresis‐loop tracer with submicrometer resolution is used to measure the destabilizing field of domains written thermomagnetically in TbFeCo and GdTbFeCo films.

Published in:

Journal of Applied Physics  (Volume:68 ,  Issue: 8 )

Date of Publication:

Oct 1990

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