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Ferromagnetic Domains in Single‐Crystal Permalloy Platelets

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1 Author(s)
DeBlois, R.W. ; General Electric Research and Development Center, Schenectady, New York

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Thin single-crystal Permalloy platelets with up to 30% iron have been grown nonepitaxially by the reduction of mixed Ni-Fe halides. Those with weak negative magnetocrystalline anisotropy, <100> edges, and (100) surfaces display a “tulip” closure-domain pattern that reveals the mode of formation of the more complicated echelon and chevron patterns observed in pure nickel platelets. The tulip pattern may appear as a modified form of the Néel-strip closure structure that Bates and co-workers have studied extensively to obtain quantitative information concerning low-field domain processes. The platelets are thus useful for extending this work to smaller, thinner, and more nearly ideal specimens. Platelets in a region near 5000 Å thick and 5% iron have <100> domains and stripes even though K1≪0.

Published in:

Journal of Applied Physics  (Volume:39 ,  Issue: 2 )