Magnetic and Free-layer Properties of MgO/(Co)FeB/MgO Structures: Dependence on CoFeB Composition

Mathias Bersweiler, Hideo Sato, Hideo Ohno

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

We investigate the magnetic properties of MgO/(Co1- xFex)75B25/MgO trilayers with Fe composition x varied from 0.5 to 1.0 and properties of magnetic tunnel junction (MTJ) with this structure as a free layer. The interfacial and bulk anisotropy energy densities increase, and the damping constant α decreases, with increasing x. For MTJs made with this structure as the free layer, the coercive field and thermal stability factor δ both increase with increasing x. Higher switching efficiency, defined as the ratio of δ to intrinsic critical current, is expected for devices with higher Fe composition owing to the smaller α.

Original languageEnglish
Article number8025339
JournalIEEE Magnetics Letters
Volume8
DOIs
Publication statusPublished - 2017 Sep 1

Keywords

  • Spin electronics
  • magnetic anisotropy
  • magnetic tunnel junction
  • thermal stability factor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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