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

Volume

38

Issue

5

fYear

2002

fDate

9/1/2002 12:00:00 AM

Firstpage

2550

Lastpage

2552

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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2002.801931

Filename

1042263