NDLI: Three-dimensional numerical simulations of stripe chopping in a magnetic perpendicular material

Content Provider	IEEE Xplore Digital Library
Author	Bagneres, A.
Copyright Year	1965
Abstract	A three-dimensional (3-D) dynamic micromagnetic model, with resolutions up to 128/spl times/128/spl times/16, for computing the magnetization dynamics in a ferromagnetic material is presented. Its originality lies in the expression of the demagnetizing field calculation, which is surprisingly simple in the frame of the distribution theory. The model was designed to investigate the 3D stripe chopping process in a plate of constant thickness with perpendicular anisotropy. The plate contains two flat walls delimiting a stripe domain. The magnetization is assumed to be periodic in the two directions of the film plane. We applied uniform perpendicular chopping fields on the initial state submitted to a 220-oersteds (oe) bias field. The damping constant is /spl alpha/=0.5. When the walls are structure-free, the stripe domain delimited by an unwinding pair of walls chops at 20 oe. It chops at 145 oe when the walls are winding. The chopping margin is therefore equal to 125 oe. When one of the walls contains a 2/spl pi/ vertical Bloch line (VBL), there is almost no margin. Both states chop at 20 oe. But the chopping process takes place later in the winding case: at about 19 ns instead of about 7 ns in the unwinding case. It happens in the regions of the walls between pairs of VBL. After it is completed, a magnetic bubble is formed. It collapses gradually. When /spl alpha/ is reduced to 0.1, the modulus of the lower chopping field is several Oe lower in all cases but one: when the walls are structure free and winding. When the stripe chops, the process happens sooner than for /spl alpha/=0.5.
Sponsorship	IEEE Magnetics Society
Starting Page	4318
Ending Page	4325
Page Count	8
File Size	617904
File Format	PDF
ISSN	00189464
Volume Number	35
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic materials Numerical simulation Magnetization Magnetic domain walls Magnetic separation Demagnetization Anisotropic magnetoresistance Equations Magnetic domains Micromagnetics
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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