Magnetization reversal and activation volume of perpendicular recording media

T. Shimatsu, Hiroyuki Uwazumi, H. Muraoka, Y. Nakamura

Research output: Contribution to journalConference articlepeer-review

13 Citations (Scopus)

Abstract

Magnetization reversal and thermal agitation of magnetization are quantitatively evaluated using a pulse magnetometer for several kinds of perpendicular magnetic recording media. In media with well-segregated grains, magnetization reversal is confirmed to proceed by coherent switching of magnetization, however, intergranular exchange coupling reduces the remanence coercivity, especially in superlattice media and amorphous/granular composite media. The activation volume in CoCr-based alloy media is experimentally indicated to be nearly the same as that of physical grain volume. It is successfully shown that media noise has a clear relation to both activation diameter and the strength of intergranular exchange coupling. It is likely that the values of activation diameter and the strength of intergranular exchange coupling are main factors to determine the cluster size of magnetization, and they must be reduced to improve the media noise performance.

Original languageEnglish
Pages (from-to)1973-1975
Number of pages3
JournalIEEE Transactions on Magnetics
Volume38
Issue number5 I
DOIs
Publication statusPublished - 2002 Sep
Event2002 International Magnetics Conference (Intermag 2002) - Amsterdam, Netherlands
Duration: 2002 Apr 282002 May 2

Keywords

  • Activation volume
  • Intergranular exchange coupling
  • Magnetization reversal mechanism
  • Media noise
  • Perpendicular recording media

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Fingerprint

Dive into the research topics of 'Magnetization reversal and activation volume of perpendicular recording media'. Together they form a unique fingerprint.

Cite this