Title :
Magnetization reversal in nanostructured permalloy rings
Author :
Lai, Mei-Feng ; Chang, Ching-Ray ; Wu, J.C. ; Wei, Zung-Hang ; Kuo, J.H. ; Lai, Jun-Yang
Author_Institution :
Dept. of Phys., Nat. Taiwan Univ., Taipei, Taiwan
fDate :
9/1/2002 12:00:00 AM
Abstract :
Three different stable magnetization configurations of soft-type nanostructured permalloy rings are investigated in detail by micromagnetic simulation. During the reversal process, the abrupt change of the hysteresis loop corresponds to the evolution of these states. Beside the quasiuniform and circular states, we find a new pair-vortices state. We compare the magnetic pole density distributions transformed from the simulation patterns with the magnetic force microscopic (MFM) images and find very good agreement between them.
Keywords :
Permalloy; ferromagnetic materials; magnetic force microscopy; magnetic hysteresis; magnetisation reversal; nanostructured materials; soft magnetic materials; Fe-Ni; circular states; hysteresis loop; magnetic force microscopic images; magnetic pole density distributions; magnetization reversal; micromagnetic simulation; nanostructured permalloy rings; pair-vortices state; quasiuniform states; simulation patterns; soft-type nanostructured permalloy rings; stable magnetization configurations; Anisotropic magnetoresistance; Hysteresis; Magnetic anisotropy; Magnetic flux; Magnetic force microscopy; Magnetization reversal; Micromagnetics; Perpendicular magnetic anisotropy; Physics; Saturation magnetization;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2002.801931
