Correlative magnetic imaging of heat-assisted magnetic recording media in cross section using lorentz TEM and MFM

Taeho Roy Kim, Charudatta Phatak, Amanda K. Petford-Long, Yunzhi Liu, Chad Taylor, Bing Zhang, Sharon Myers, Andrea Greene, Tomoko Seki, Michael Alex, Gerardo A. Bertero, Robert Sinclair*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In order to increase the storage density of hard disk drives, a detailed understanding of the magnetic structure of the granular magnetic layer is essential. Here, we demonstrate an experimental procedure of imaging recorded bits on heat-assisted magnetic recording (HAMR) media in cross section using Lorentz transmission electron microscopy (TEM). With magnetic force microscopy and focused ion beam (FIB), we successfully targeted a single track to prepare cross-sectional TEM specimens. Then, we characterized the magnetic structure of bits with their precise location and orientation using Fresnel mode of Lorentz TEM. This method can promote understanding of the correlation between bits and their material structure in HAMR media to design better the magnetic layer.

Original languageEnglish (US)
Article numberA2056
JournalIEEE Transactions on Magnetics
Volume54
Issue number1
DOIs
StatePublished - Jan 2018

Keywords

  • Cross-sectional magnetic imaging
  • Fresnel imaging mode
  • Heat-assisted magnetic recording (HAMR) media
  • Lorentz transmission electron microscopy (TEM)
  • Recorded bits

ASJC Scopus subject areas

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

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