Enhancement of Perpendicular Magnetic Anisotropy Through Fe Insertion at the CoFe/W Interface

Shouzhong Peng, Lezhi Wang, Xiang Li, Zilu Wang, Jiaqi Zhou, Junfeng Qiao, Runze Chen, Youguang Zhang, Kang L. Wang, Weisheng Zhao

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Magnetic tunnel junctions (MTJs) based on MgO/CoFeB/W structures are of particular interest for magnetic random access memories due to their high tunnel magnetoresistance, low damping, and stable properties at high annealing temperature. One of the major challenges is to obtain a strong interfacial perpendicular magnetic anisotropy (PMA) for sufficient thermal stability during data storage. Here we investigate magnetic anisotropy energies (MAEs) in the ferromagnet (FM)/W structure with different FM materials and interface insertions. We find that the Fe/W interface exhibits a remarkable PMA, whereas the Co/W interface displays a large in-plane anisotropy, which reduces the PMA in the MgO/CoFeB/W structure. By inserting a thin Fe layer at the CoFe/W interface, the interfacial PMA can be enhanced to 3.34 mJ/m2. Microscopic mechanism behind these phenomena is explained with the changes of orbital-resolved MAEs due to the charge redistribution at the interface. These findings pave a new way for the enhancement of PMA and point toward the possibility of achieving high thermal stability in small-node MTJs.

Original languageEnglish
Article number8408732
JournalIEEE Transactions on Magnetics
Volume54
Issue number11
DOIs
Publication statusPublished - 2018 Nov

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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