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Temperature dependence of coercivity of epitaxial magnetic garnet films

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2 Author(s)
Pardaviā€Horvath, M. ; Central Research Institute for Physics, Hungarian Academy of Sciences, H‐1525 Budapest 114, P. O. Box 49, Hungary ; Vertesy, G.

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The temperature dependence of the coercivity Hc, magnetization, anisotropy, and domain wall energy was measured for SmGaYIG, SmCaGeYIG, and SmLuCaGeYIG epitaxial bubble garnet films from 100 K up to the Néel temperature TN≳400 K. Data were analyzed together with results published on similar samples on the basis of the theory of domain wall pinning by a random array of uniform defects and a good fit was observed in the form of H1/2c=H1/20 -CT2/3, where H0 and C are constants. The maximum average interaction force between defects and walls is 2.9×10-7 dyne, corresponding to the minimum interaction range equal to the wall width. The density of defects is in the range between 1014 and 1016 cm-3. The size and number of defects derived from the temperature dependence of Hc is in agreement with the microstructure of epitaxial garnets revealed by transmission electron microscopy.

Published in:

Journal of Applied Physics  (Volume:58 ,  Issue: 10 )

Date of Publication:

Nov 1985

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