Tailor-made nano-structured materials for perpendicular recording media and head-precise control of direct/indirect exchange coupling

Migaku Takahashi, Masakiyo Tsunoda, Shin Saito

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Tailor-made nano-structured spin materials obtained by precisely controlled nano-scale fabrication technologies for use in ultra-high density hard disk drives (HDDs), as well as an understanding of their nanomagnetics, are essential from the view point of materials, processes, and physics. Artificial control of the exchange coupling among ferromagnetic layers through the RKKY interaction (indirect) and direct exchange coupling represented as the exchange bias at the ferromagnetic (FM)/antiferromagnetic (AFM) interface are of great interest and have received significant attention to induce new modulated spin structures in conventional simple FM materials. In particular, soft magnetic under layer (SUL) with strong synthetic antiferromagnetic (SAF) coupling between two adjacent soft magnetic layers, exchange coupled stacked media introducing exchange coupling between FM layers and giant exchange anisotropy at the FM/AFM interface have attracted significant attention from the view point of applications. Within the framework of the present paper, we discuss future technical trends for SUL, granular media and the spin-valve head from the viewpoint of direct and/or indirect exchange coupling based on our recent results.

Original languageEnglish
Pages (from-to)539-544
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Volume321
Issue number6
DOIs
Publication statusPublished - 2009 Mar 1

Keywords

  • Exchange coupling
  • Nano structure
  • Recording media
  • Spin-valve head

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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