Title :
Magnetic domain studies of permalloy wire-based structures with junctions
Author :
Hirohata, A. ; Yao, C.C. ; Leung, H.T. ; Xu, Y.B. ; Guertler, C.M. ; Bland, J.A.C.
Author_Institution :
Cavendish Lab., Cambridge Univ., UK
fDate :
9/1/2000 12:00:00 AM
Abstract :
Permalloy (Ni80Fe20) wire-based structures (30 nm thick and 1·w·10 μm wide) with junctions (crosses, networks, H-shapes, rectangular chains and ring chains) prepared on a GaAs(100) substrate were observed in both their demagnetized and remanent states by magnetic force microscopy (MFM) in order to investigate the role of junction geometry in domain formation. Except in ring chains, two classes of domain configuration are found at the junction: (i) a domain wall-like feature due to abrupt spin rotation and (ii) a triangle-shape domain consistent with a flux closure configuration. Ring chains, on the other hand, form vortex domains at every other junction. The MFM observations are compared with micromagnetic calculations which qualitatively support the magnetic domain configurations
Keywords :
Permalloy; magnetic domain walls; magnetic force microscopy; magnetic thin films; GaAs; GaAs(100) substrate; Ni80Fe20; abrupt spin rotation; demagnetized state; domain configuration; flux closure configuration; junction geometry; magnetic force microscopy; permalloy wire-based structures; remanent state; triangle-shape domain; vortex domains; Atomic force microscopy; Gallium arsenide; Iron; Magnetic domain walls; Magnetic domains; Magnetic force microscopy; Magnetic forces; Micromagnetics; Probes; Substrates;
Journal_Title :
Magnetics, IEEE Transactions on
