NDLI: Numerical simulation of thermomagnetic writing in RE-TM films

Content Provider	IEEE Xplore Digital Library
Author	McDaniel, T. Mansuripur, M.
Copyright Year	1965
Abstract	In the development of high-performance magneto-optic (MO) media for data storage, it is important to understand the processes by which reversed magnetic domains are formed in thermomagnetic writing. Thin films of amorphous rare earth-transition metal (RE-TM) alloys deposited by sputtering on a nonmagnetic substrate have become a popular choice for an erasable storage medium. We have developed a simplified micromagnetics simulation of the behavior of RE-TM films that produces an equilibrium configuration of film magnetization for a specified thermal profile and applied magnetic field. This Monte Carlo-type model is useful for assessing the size, shape, and stability of written marks in MO recording. In addition, the simulation provides estimates of the minimum field strength required for nucleation and growth of reversed domains, and hence it predicts film coercivity at any temperature. An equilibrium state is determined by magnetic energy minimization. Magnetization dynamics are not incorporated into the model, but instead, a quasi-static approach to equilibrium is simulated. Spatial resolution can be arbitrarily small, and discretization down to about 20 nm can be reasonably accommodated. Readout of written domains has been incorporated as an additional feature of this model.
Sponsorship	IEEE Magnetics Society
Starting Page	2943
Ending Page	2945
Page Count	3
File Size	466085
File Format	PDF
ISSN	00189464
Volume Number	23
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1987-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Numerical simulation Writing Magnetic films Magnetic domains Sputtering Magnetization Memory Amorphous materials Substrates Micromagnetics
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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