Perpendicular magnetic anisotropy of a Ta/NiFeB/MgO system and its magnetic coupling with [Pt/Co] multilayers

Young Chan Won, Sang Ho Lim

Research output: Contribution to journalArticlepeer-review

Abstract

The perpendicular magnetic anisotropy (PMA) and crystalline structure of Ta/NiFeB/MgO stacks are investigated. When the stack is annealed, PMA is induced and the magnetic moment increases due to the crystallization of bcc NiFe from amorphous NiFeB. This structure is combined with [Pt/Co]6 multilayers to study the change in the magnetic coupling and PMA behavior with the change in the Ta thickness inserted in-between and the annealing temperature. Among the [Pt/Co]6/Ta/NiFeB/MgO stacks, the stack with a 0.5-nm-thick Ta layer shows the strongest PMA with an effective PMA energy density of 4.4 × 106 erg/cm3 upon annealing at 400 °C. Further, the X-ray diffraction study of the crystalline structures confirms the formation of the NiFe (001) phase, which is essential for achieving a high tunneling magnetoresistance ratio.

Original languageEnglish
Article number157678
JournalJournal of Alloys and Compounds
Volume858
DOIs
Publication statusPublished - 2021 Mar 25

Keywords

  • Magnetic films and multilayers
  • Perpendicular magnetic anisotropy
  • Ta/NiFeB/MgO
  • Template effect
  • [Pt/Co] multilayers

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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