Damping constant in a free layer in nanoscale CoFeB/MgO magnetic tunnel junctions investigated by homodyne-detected ferromagnetic resonance

Motoya Shinozaki, Eriko Hirayama, Shun Kanai, Hideo Sato, Fumihiro Matsukura, Hideo Ohno

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

We investigate the damping constant of a free layer with a perpendicular magnetic easy axis in nanoscale CoFeB/MgO magnetic tunnel junctions (MTJs) with a reference layer with an in-plane easy direction. The built-in noncollinear magnetization configuration in the MTJs allows us to measure homodyne-detected ferromagnetic resonance without tilting the magnetization direction of the free layer from the device normal. The damping constants determined from the spectral linewidths after the subtraction of the inhomogeneous broadening are nearly independent of the device diameter ranging from 70 to 100 nm, and take values similar to those reported for blanket CoFeB films.

Original languageEnglish
Article number013001
JournalApplied Physics Express
Volume10
Issue number1
DOIs
Publication statusPublished - 2017 Jan

ASJC Scopus subject areas

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

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