Multilevel-3D bit patterned magnetic media with 8 signal levels per nanocolumn

Nissim Amos, John Butler, Beomseop Lee, Meir H. Shachar, Bing Hu, Yuan Tian, Jeongmin Hong, Davil Garcia, Rabee M. Ikkawi, Robert C. Haddon, Dmitri Litvinov, Sakhrat Khizroev

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

This letter presents an experimental study that shows that a 3rd physical dimension may be used to further increase information packing density in magnetic storage devices. We demonstrate the feasibility of at least quadrupling the magnetic states of magnetic-based data storage devices by recording and reading information from nanopillars with three magnetically-decoupled layers. Magneto-optical Kerr effect microscopy and magnetic force microscopy analysis show that both continuous (thin film) and patterned triple-stack magnetic media can generate eight magnetically-stable states. This is in comparison to only two states in conventional magnetic recording. Our work further reveals that ferromagnetic interaction between magnetic layers can be reduced by combining Co/Pt and Co/Pd multilayers media. Finally, we are showing for the first time an MFM image of multilevel-3D bit patterned media with 8 discrete signal levels.

Original languageEnglish (US)
Article numbere40134
JournalPloS one
Volume7
Issue number7
DOIs
StatePublished - Jul 10 2012

ASJC Scopus subject areas

  • General

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