Title

Temperature Dependence Of The Magnetization Reversal Of Thin-Film Longitudinal Magnetic Recording Media

Keywords

Activation volume; Longitudinal recording media; Magnetic switching; Switching volume; Thermal stability

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/kBT, where K u is the unixial anisotropy, V the switching volume, kB is Boltzmann's constant, and T the temperature. Temperature-dependent vibrating sample magnetometer measurements were made of the saturation and remanent magnetization Ms and Mr, remanent coercivity H cr, and Ku. The Sharrock equation was used to calculate S, and the time-independent switching field Ho of representative longitudinal recording media. Instead of the product SkBT decreasing proportionally to Ku or Ho with increasing temperature as initially expected, we find SkBT decreases at approximately half this rate.

Publication Date

7-1-2004

Publication Title

IEEE Transactions on Magnetics

Volume

40

Issue

4 II

Number of Pages

2440-2442

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1109/TMAG.2004.829815

Socpus ID

4444295797 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/4444295797

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