Zusammenfassung
We have studied the magnetisation reversal of elliptical, polycrystalline permalloy elements as a function of their aspect ratios by Lorentz transmission electron microscopy. In situ magnetising experiments revealed four possible types of magnetisation reversal, which depend on the in-plane and out-of-plane aspect ratios of the submicron elements. The types differ in the number of observed ...
Zusammenfassung
We have studied the magnetisation reversal of elliptical, polycrystalline permalloy elements as a function of their aspect ratios by Lorentz transmission electron microscopy. In situ magnetising experiments revealed four possible types of magnetisation reversal, which depend on the in-plane and out-of-plane aspect ratios of the submicron elements. The types differ in the number of observed vortices and a low or high remnant magnetisation. Diagrams of the types of magnetisation reversal are given for submicron elliptical elements of length 350, 550, 750 nm and a thickness of 8 and 15 nm, respectively. The switching, vortex evolution and annihilation fields were investigated and show a strong correlation with the element shape. We present magnetisation loops which are obtained by micromagnetic simulations and are characteristic for the observed types of reversal. (C) 2002 Elsevier Science B.V. All rights reserved.
Altmetric