Dependence of magnetic anisotropy in Co 20Fe 60B 20 free layers on capping layers in MgO-based magnetic tunnel junctions with in-plane easy axis

Hiroyuki Yamamoto, Jun Hayakawa, Katsuya Miura, Kenchi Ito, Hideyuki Matsuoka, Shoji Ikeda, Hideo Ohno

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Perpendicular magnetic anisotropy (PMA) in Co 20Fe 60B 20 films depending on the adjacent layers of Ta, Ru, and MgO was studied for reduction of switching current density J c0 in in-plane magnetic tunnel junctions (MTJs). A MgO layer reduces the out-of-plane saturation field (H s) of in-plane easy axis Co 20Fe 60B 20 films by inducing a strong PMA at the Co 20Fe 60B 20/MgO interface. The PMA is not affected much by the crystallinity in Co 20Fe 60B 20 films with different capping layers. MTJ with a MgO capping layer shows a lower J c0 than that with a Ru capping layer, in accordance with the reduction of H s.

Original languageEnglish
Article number053002
JournalApplied Physics Express
Volume5
Issue number5
DOIs
Publication statusPublished - 2012 May

ASJC Scopus subject areas

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

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