Temperature Dependence of Coercivity at Recording Frequencies: Barium Ferrite versus Oxide

Linda S. Meichle, Randall H. Victora

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

We demonstrate that materials with comparable thermal dependence of coercivity under normal laboratory measurement conditions, differing only in sign, have quite different properties at recording frequencies. Barium ferrites, with positive dHc/dT, have augmented thermal dependence, while oxides, with negative dHc/dT, exhibit weaker thermal dependence at recording frequencies. Experimental data and theoretical analysis confirm this behavior. Two methods of predicting coercivity as a function of temperature, for recording time scales, are presented. The implications for direct overwrite performance while thermally cycling are discussed.

Original languageEnglish (US)
Pages (from-to)3393-3397
Number of pages5
JournalIEEE Transactions on Magnetics
Volume28
Issue number6
DOIs
StatePublished - Nov 1992

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