Switching simulations in perpendicular media: spin-wave instabilities

Author

Visscher, P.B. ; Apalkov, D.M. ; Feng, Xuebing

Author_Institution

Dept. of Phys. & Astron., Alabama Univ., Tuscaloosa, AL, USA

Volume

38

Issue

5

fYear

2002

fDate

9/1/2002 12:00:00 AM

Firstpage

2523

Lastpage

2525

Abstract

We have simulated the switching process in a perpendicular medium, using a simple model of a monopolar head, and visualized it by plotting the magnetizations of computational cells as a swarm of points on the time-varying contour plot of the Stoner-Wohlfarth energy. This viewpoint clarifies the spin-wave instability that leads to switching. We find that the exchange interaction leads to energy flow and, hence, energy dispersion within a grain, leading to incoherence and switching.

Keywords

exchange interactions (electron); magnetic heads; magnetic switching; magnetisation; perpendicular magnetic recording; spin waves; Landau-Lifshitz equation; Stoner-Wohlfarth energy; computational cell magnetizations; energy dispersion; energy flow; exchange interaction; incoherence; micromagnetic calculation; monopolar head; perpendicular media; spin-wave instabilities; switching simulations; time-varying contour plot; Computational modeling; Data visualization; Elementary particle exchange interactions; Fluctuations; Magnetic heads; Magnetic switching; Micromagnetics; Perpendicular magnetic recording; Predictive models; US Department of Energy;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2002.801911

Filename

1042248