Title :
Edge-curling-wall discontinuities and interactions with Bloch walls in easy-axis Permalloy
Author :
Herman, Dean A., Jr. ; Trouilloud, Philip L. ; Argyle, Bernell E. ; Petek, Bojan ; Romankiw, Lubomyr T. ; Bezama, Jasmina S. ; Rath, David L. ; Canaperi, Donald F. ; Komsa, Michelle L.
Author_Institution :
IBM Thomas J. Watson Res. Center, Yorktown Heights, NY, USA
fDate :
11/1/1988 12:00:00 AM
Abstract :
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
Keywords :
Permalloy; ferromagnetic properties of substances; laminations; magnetic domain walls; magnetic thin films; magneto-optical effects; Bloch walls; Permalloy layers; easy-axis Permalloy; edge curling wall discontinuities; laminations; laser magnetooptic microscope; sectored-vortex discontinuity; single-domain state; two-magnetic-layer elements; Finite element methods; Geometrical optics; Glass; Laminates; Laser modes; Lighting; Magnetic domain walls; Magnetic force microscopy; Petroleum; Solid modeling;
Journal_Title :
Magnetics, IEEE Transactions on
