Size dependence of magnetic properties of nanoscale CoFeB-MgO magnetic tunnel junctions with perpendicular magnetic easy axis observed by ferromagnetic resonance

Kotaro Mizunuma, Michihiko Yamanouchi, Hideo Sato, Shoji Ikeda, Shun Kanai, Fumihiro Matsukura, Hideo Ohno

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

The junction diameter D dependence of effective magnetic fields in a recording layer of CoFeB-MgO magnetic tunnel junctions with perpendicular magnetic easy axis is evaluated by ferromagnetic resonance measurements using the homodyne detection technique. The effective perpendicular magnetic field increases with decreasing D, which reflects mainly the reduction of the demagnetizing factor normal to the film plane. The stray field from a reference layer also increases with reducing D, which is in agreement with the D dependence of the shift field of the center of minor resistance versus perpendicular magnetic field curves with respect to zero magnetic field.

Original languageEnglish
Article number063002
JournalApplied Physics Express
Volume6
Issue number6
DOIs
Publication statusPublished - 2013 Jun

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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