Domain processes and high frequency permeability of laminated Co 91Nb6Zr3/SiO2 narrow strips

High resolution and real time domain images and magnetisation reversal processes were observed by Lorentz Microscopy with in-situ applied magnetic fields for patterned narrow strips of single layer and double layer CoNbZr films. Results were compared with the initial high frequency permeability measurement of the narrow strips. It was revealed that the domain structures and magnetisation reversal processes were distinctively different at the edge and at the central part of wide strips. The size of the edge domains was typically 3~4 μm-wide. Double walls were observed in dual-layer strips indicating some magnetostatic coupling between sublayers. The easy-axis state was sustained by double layer lamination for 3 μm-wide strips. Distinct magnetisation reversal processes and domain structures were observed for single layer and double layer narrow strips