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Publication
Journal of Magnetism and Magnetic Materials
Paper
TEM investigation of the magnetisation processes in exchange coupled multilayer films
Abstract
The magnetisation reversal processes in ferromagnetically coupled multilayer films of (Co/NiFe/Co)/Cu were investigated using Fresnel imaging. The films possess an in-plane uniaxial anisotropy and both easy and hard axis magnetisation reversal were typical of ferromagnetically coupled multilayer films. On application of a hard axis field, a splitting of the domain walls into two was observed. No wall transitions occurred but the split wall separation increased with the applied field. The formation of 360° wall loops from small domains was observed on application of a hard axis field and magnetic fields up to 20Hk were required to annihilate them. The magnetisation reversal on application of a field at an angle of 25° to the hard axis is highly complex and a detailed analysis of the reversal processes has been carried out using power spectra of Fresnel images taken during magnetisation reversal. © 1994.