Direct observation of atomic ordering and interface structure in co 2mnsi/mgo/co2mnsi magnetic tunnel junctions by high-angle annular dark-field scanning transmission electron microscopy

Toyoo Miyajima, Mikihiko Ogane, Yasutoshi Kotaka, Takashi Yamazaki, Mineharu Tsukada, Yuji Kataoka, Hiroshi Naganuma, Yasuo Ando

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

The atomic ordering of Co2MnSi (CMS) full-Heusler film and the interface structure of CMS/MgO/CMS magnetic tunnel junctions (MTJs) were investigated by high-angle annular dark-field scanning transmission electron microscopy (HAADF STEM). We observed the atomic ordering of L21 and B2 structures of CMS from the atomic number (Z) contrast STEM images. We also confirmed that the interface structure consists of the layer next to the Co layer terminating in the CMS to MgO layer from the layer periodicity along the [001] direction, however, site-disorder exists between two atomic layers at the termination of CMS, including locally L21-ordered MnSi terminated structure.

Original languageEnglish
Article number093001
JournalApplied Physics Express
Volume2
Issue number9
DOIs
Publication statusPublished - 2009 Sep 1

ASJC Scopus subject areas

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

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