論文

査読有り
2015年2月

Probing the electronic and spintronic properties of buried interfaces by extremely low energy photoemission spectroscopy

SCIENTIFIC REPORTS
  • Roman Fetzer
  • ,
  • Benjamin Stadtmueller
  • ,
  • Yusuke Ohdaira
  • ,
  • Hiroshi Naganuma
  • ,
  • Mikihiko Oogane
  • ,
  • Yasuo Ando
  • ,
  • Tomoyuki Taira
  • ,
  • Tetsuya Uemura
  • ,
  • Masafumi Yamamoto
  • ,
  • Martin Aeschlimann
  • ,
  • Mirko Cinchetti

5
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1038/srep08537
出版者・発行元
NATURE PUBLISHING GROUP

Ultraviolet photoemission spectroscopy (UPS) is a powerful tool to study the electronic spin and symmetry features at both surfaces and interfaces to ultrathin top layers. However, the very low mean free path of the photoelectrons usually prevents a direct access to the properties of buried interfaces. The latter are of particular interest since they crucially influence the performance of spintronic devices like magnetic tunnel junctions (MTJs). Here, we introduce spin-resolved extremely low energy photoemission spectroscopy (ELEPS) to provide a powerful way for overcoming this limitation. We apply ELEPS to the interface formed between the half-metallic Heusler compound Co2MnSi and the insulator MgO, prepared as in state-of-the-art Co2MnSi/MgO-based MTJs. The high accordance between the spintronic fingerprint of the free Co2MnSi surface and the Co2MnSi/MgO interface buried below up to 4 nm MgO provides clear evidence for the high interface sensitivity of ELEPS to buried interfaces. Although the absolute values of the interface spin polarization are well below 100%, the now accessible spin-and symmetry-resolved wave functions are in line with the predicted existence of non-collinear spin moments at the Co2MnSi/MgO interface, one of the mechanisms evoked to explain the controversially discussed performance loss of Heusler-based MTJs at room temperature.

Web of Science ® 被引用回数 : 16

リンク情報
DOI
https://doi.org/10.1038/srep08537
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000349712900010&DestApp=WOS_CPL

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