Micromagnetic modeling of the thermomagnetic recording process

Author

Hoinville, Jay R.

Author_Institution

Euxine Technol., Broomfield, CO, USA

Volume

37

Issue

4

fYear

2001

fDate

7/1/2001 12:00:00 AM

Firstpage

1254

Lastpage

1256

Abstract

A thermally-activated micromagnetic model has been developed to model the thermomagnetic recording process. In this model the crystal anisotropy, K_u, and saturation magnetization, M_s, of each grain depend on temperature. To model the thermomagnetic recording process a high-coercivity, H_c, medium is heated with a thermal profile from a laser so that the medium is near its Curie point. In this state transitions are written with a Karlquist type write head. Thermomagnetically-written transitions are distinguished by curved transitions and sharp track-edges with no erase bands. Results are presented which discuss the steps required to optimize the thermomagnetic recording process

Keywords

magnetic anisotropy; magnetic heads; magnetisation; magneto-optical recording; superparamagnetism; thermal stability; thermomagnetic recording; Curie point; Karlquist type write head; crystal anisotropy; curved transitions; high-coercivity medium; longitudinal recording; magneto-optical media; saturation magnetization; sharp track-edges; superparamagnetic limit; thermal profile; thermally-activated micromagnetic model; thermomagnetic recording process; thermomagnetically-written transitions; Anisotropic magnetoresistance; Heat-assisted magnetic recording; Laser transitions; Lattices; Magnetooptic recording; Micromagnetics; Saturation magnetization; Temperature dependence; Thermal stability; Writing;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.950810

Filename

950810