NDLI: Contribution of Convex Surfaces to Magnetostatic Interaction in Granular Medium

Content Provider	IEEE Xplore Digital Library
Author	Jehyun Lee Suess, D. Schrefl, T. Eu Sun Yu You Sub Lee Kyu Hwan Oh Fidler, J.
Copyright Year	1965
Abstract	Finite element micromagnetic studies on the magnetic behaviors of granular structures are performed to investigate the magnetostatic contributions of the curved surfaces of grains with various film thicknesses. From the result, it is found that the magnetization reversal process in one grain is much faster when the grains have convex surfaces. The magnetization vectors of all convex models are stabilized in shorter time by factor of 10 compared to those of flat models. And, the reversals of each grain are carried out by nucleation and domain wall propagation in the entire granular structure, whereas the grains in flat model are individually reversed. Moreover, the magnetization behaviors of the convex models are closer to the experimental results. Since the geometric and magnetic conditions are same for the two models, the only origin of the more realistic magnetic behavior is the magnetostatic interaction between the grains, enhanced by introducing the convex surfaces. From the further analysis, it is found that the convex surface induces pinning field that suppress other parts' reversal.
Sponsorship	IEEE Magnetics Society
Starting Page	2655
Ending Page	2658
Page Count	4
File Size	553573
File Format	PDF
ISSN	00189464
Volume Number	45
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetostatics Perpendicular magnetic recording Magnetic anisotropy Perpendicular magnetic anisotropy Magnetic materials Saturation magnetization Shape Finite element methods Micromagnetics Magnetic domain walls surfaces Magnetic recording magnetization reversal magnetostatics simulation
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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