Free-layer size dependence of anisotropy field in nanoscale CoFeB/MgO magnetic tunnel junctions

Motoya Shinozaki, Junta Igarashi, Hideo Sato, Hideo Ohno

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We investigate free-layer size D dependence of effective anisotropy field in nanoscale CoFeB/MgO magnetic tunnel junctions by homodynedetected ferromagnetic resonance. The effective anisotropy field HeffK monotonically increases with decreasing D for a device with the referencelayer size much larger than the free-layer size. In contrast, HeffK does not increase in a monotonic manner for a device with the reference-layer size comparable to the free-layer size. We reveal that the difference can be explained by the variation of the anisotropy field in the vicinity of the device edge.

Original languageEnglish
Article number043001
JournalApplied Physics Express
Volume11
Issue number4
DOIs
Publication statusPublished - 2018 Apr

ASJC Scopus subject areas

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

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