Reduction of the intergranular exchange coupling in granular type perpendicular magnetic recording media -inserting a thin layer deposited under high ar gas pressure into the initial growth region of recording layer-

Shingo Sasaki, Shin Saito, Migaku Takahashi

Research output: Contribution to journalArticlepeer-review

Abstract

For realizing higher recording density of perpendicular magnetic recording media, a reduction of the magnetic exchange coupling among magnetic grains in the CO74Pt16Cr10-8 mol-SiO2 granular recording layer (RL) is essential.We propose inserting the thin layer thickness of 1 nm deposited under high Ar gas pressure of 8 Pa into the initial growth region of the RL. Larger perpendicular coercivity of 6.4 kOe and a smaller hysteresis loop gradient at coercivity of 2.1 were obtained, which indicated that magnetically well-isolated media and a signîcant reduction of the magnetic exchange coupling in the granular RL were realized. By ̂lm composition analysis, oxygen content of the insertion layer was found to be very high. These results suggest that magnetic grains are well segregated by forming more oxide mixture of SiO2 and Cr-oxide at the grain boundaries in the insertion layer.

Original languageEnglish
Pages (from-to)377-381
Number of pages5
JournalJournal of the Vacuum Society of Japan
Volume56
Issue number9
DOIs
Publication statusPublished - 2013 Oct 9

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation
  • Surfaces and Interfaces
  • Spectroscopy

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