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Edge-curling-wall discontinuities and interactions with Bloch walls in easy-axis Permalloy

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9 Author(s)
Herman, D. ; IBM Thomas J. Watson Res. Center, Yorktown Heights, NY, USA ; Trouilloud, Philip L. ; Argyle, B.E. ; Petek, B.
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Laminations of soft-magnetic and nonmagnetic films, which meet the criteria for easy-axis state, have edge-curling walls instead of the triangular closure domains of single sheets. A laser magnetooptic microscope has been used to image and model two types of edge-curling wall discontinuities that are induced by geometry in finite elements. One is a sectored-vortex discontinuity in a single-domain state that was not previously predicted. In addition, laminates with Permalloy layers on the order of 1-μm thick are usually divided into easy-axis domains by 180° Bloch walls. Several types of interaction of a Bloch wall with an edge-curling wall are described. The existence of coupled (top and bottom layers) single-domain states in two-magnetic-layer elements is confirmed

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