Role of bottom layer of double recording layer structure for antiferromagnetically coupled longitudinal media

T. Q. Li, D. Hasegawa, S. Saito, H. Ohyama, M. Imakawa, Migaku Takahashi

Research output: Contribution to journalArticlepeer-review

Abstract

Double recording layers stacked on a Ru spacing layer are commonly used to obtain good recording properties for antiferromagnetically coupled (AFC) longitudinal media. In this paper, we report on a study that clarified the role of the bottom recording layer (BRL). We measured physical magnetic properties such as magnetic anisotropy field (Hk), magnetocrystalline anisotropy energy (Ku), intergranular interaction, and thermal agitation of the AFC media, with and without BRL. Results showed that: 1) even a thin BRL (1 nm thick) significantly increases remanent coercivity Hcr; 2) this increase in Hk is mainly caused by an increase in Hk due to elimination of the low Ku region at the bottom portion of the top recording layer; and 3) judging from magnetic cluster size, insertion of a BRL can reduce the intergranular exchange coupling at the initial growth region of the recording layer.

Original languageEnglish
Article number1678067
Pages (from-to)2215-2217
Number of pages3
JournalIEEE Transactions on Magnetics
Volume42
Issue number9
DOIs
Publication statusPublished - 2006 Sep 1

Keywords

  • AFC
  • Double recording layer
  • Intergranular exchange coupling
  • Magnetic anisotropy field
  • Remanent coercivity

ASJC Scopus subject areas

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

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