Title :
Magnetization reversal in mesoscopic Ni80Fe20 wires: a magnetic domain launching device
Author :
Lee, W.Y. ; Hirohata, A. ; Leung, H.T. ; Xu, Y.B. ; Gardiner, S.M. ; Yao, C.C. ; Bland, J.A.C.
Author_Institution :
Cavendish Lab., Cambridge Univ., UK
fDate :
9/1/2000 12:00:00 AM
Abstract :
The magnetization reversal process in mesoscopic permalloy (Ni80Fe20) wire structures has been investigated using scanning Kerr microscopy, magnetic force microscopy (MFM) and micromagnetic calculations. We find that the junction offers a site for reversed domain wall nucleation in the narrow part of the wires. As a consequence, the switching field is dominated by the domain nucleation field and the junction region initiates reversal by the wall motion following the nucleation of domains. Our results suggest the possibility of designing structures that can be used to “launch” reverse domains in narrow wires within a controlled field range
Keywords :
Kerr magneto-optical effect; Permalloy; ferromagnetic materials; interface magnetism; magnetic domain walls; magnetic domains; magnetic force microscopy; magnetic switching; magnetisation reversal; mesoscopic systems; Ni80Fe20; domain nucleation field; junction region; magnetic domain launching device; magnetic force microscopy; magnetization reversal; mesoscopic Ni80Fe20 wires; mesoscopic permalloy; micromagnetic calculations; narrow wires; reverse domains; reversed domain wall nucleation; scanning Kerr microscopy; switching field; wall motion; Iron; Magnetic domain walls; Magnetic domains; Magnetic force microscopy; Magnetic forces; Magnetic switching; Magnetization reversal; Micromagnetics; Shape; Wires;
Journal_Title :
Magnetics, IEEE Transactions on
