Magnetic Domains in Evaporated Thin Films of Nickel-Iron

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Abstract
The longitudinal Kerr magneto-optic technique proves to be well suited for the observation of domains in evaporated ferromagnetic thin films. In a series of six films of NiFe ranging in thickness from 20 000 angstroms to 500 angstroms, domain patterns have been photographed in all but the two thickest. Many features of domain structure, familiar in bulk single crystals, have been observed in the films. Certain unusual features of domain behavior appear characteristic of the thinnest specimens and have also been photographed. Complexities in many of the patterns, uncorrelated with change of film thickness, are probably due to uncontrolled physical factors connected with the manufacture and the preservation of the specimens. The necessity of careful control of such factors for quantitative domain investigation is emphasized.

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