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Calculations of Stable Domain Radii Produced by Thermomagnetic Writing

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1 Author(s)
Huth, B.G. ; IBM Research Division Laboratory, Monterey and Cottle Roads, San Jose, California 95114, USA

Calculations are performed to determine the stable radius of a cylindrically symmetric domain nucleated in magneto-optical films during thermomagnetic writing with a laser beam. A critical bound on domain size is calculated which determines whether or not a domain of given radius, once nucleated, will be stable. The analysis shows that for a ferromagnetic material such as MnAlGe, the domain dimensions can grow beyond the local region of material that is heated above the Curie temperature. For ferrimagnetic thin films having a compensation point Tcomp, stability depends on the difference between ambient and compensation temperatures, ΔT = Ta − Tcomp. With ΔT ≈ 0, wall energy dominates and the critical radius can be calculated from Rc = σ/(2MHc).

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

Published in:

IBM Journal of Research and Development  (Volume:18 ,  Issue: 2 )