Analysis of unswitched grains in thermally assisted magnetic recording

Simon John Greaves, Hiroaki Muraoka, Yasushi Kanai

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


A simplified model of thermally assisted magnetic recording was used to study the influence of thermal gradients and the average grain size in recording media. The signal to noise ratio (SNR) peaked for thermal gradients between 10 and 20K/nm and increased as the average grain size was reduced. However, the number of unswitched grains in written bits increased for smaller grains, limiting the increase in SNR. Exchange coupling decreased the probability of a grain remaining unswitched, but increased the magnetic cluster size, although the transition noise remained unaffected until the exchange coupling strength exceeded 0.8erg/cm2.

Original languageEnglish
Article number17B708
JournalJournal of Applied Physics
Issue number17
Publication statusPublished - 2014 May 7

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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