Title

Temperature dependence of the magnetization reversal of thin-film longitudinal magnetic recording media

Authors

Authors

K. R. Coffey; J. U. Thiele;T. Thomson

Comments

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Abbreviated Journal Title

IEEE Trans. Magn.

Keywords

activation volume; longitudinal recording media; magnetic switching; switching volume; thermal stability; SWITCHING FIELD; Engineering, Electrical & Electronic; Physics, Applied

Abstract

As longitudinal magnetic recording media approach the superparamagnetic limit, temperature-dependent effects are becoming ever more important. This work reports an unexpected temperature dependence for the Sharrock stability parameter S typically given as KuV/k(B)T, where K-u is the unixial anisotropy, V the switching volume, k(B) is Boltzmann's constant, and T the temperature. Temperature-dependent vibrating sample magnetometer measurements were made of the saturation and remanent magnetization M-s and M-r, remanent coercivity H-cr, and K-u. The Sharrock equation was used to calculate S, and the time-independent switching field H-o of representative longitudinal recording media. Instead of the product Sk(B)T decreasing proportionally to K-u or H-o with increasing temperature as initially expected, we find Sk(B)T decreases at approximately half this rate.

Journal Title

Ieee Transactions on Magnetics

Volume

40

Issue/Number

4

Publication Date

1-1-2004

Document Type

Article; Proceedings Paper

Language

English

First Page

2440

Last Page

2442

WOS Identifier

WOS:000223446700149

ISSN

0018-9464

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