Magnetic-field-angle dependence of coercivity in CoFeB/MgO magnetic tunnel junctions with perpendicular easy axis

J. Igarashi, Justin Llandro, Hideo Sato, Fumihiro Matsukura, Hideo Ohno

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We investigate the magnetization-reversal mode in CoFeB/MgO magnetic tunnel junctions with perpendicular easy axis from the magnetic-field-angle dependence of coercivity. The reversal in a free layer with diameter of ∼20 nm is found to be in a good agreement with coherent reversal mode for a device with a reference layer much larger than the free layer. However, the reversal mode is quite different in a junction in which the two layers are almost the same size. From micromagnetic simulation, the difference is attributed to the reduction of the magnetic anisotropy in the vicinity of the device edge.

Original languageEnglish
Article number132407
JournalApplied Physics Letters
Volume111
Issue number13
DOIs
Publication statusPublished - 2017 Sep 25

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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