Ferromagnetism at the surface of a LaCo O3 single crystal observed using scanning SQUID microscopy

A. Harada, T. Taniyama, Y. Takeuchi, T. Sato, T. Kyômen, M. Itoh

研究成果: Article査読

35 被引用数 (Scopus)

抄録

Evidence for ferromagnetism at the surface of a LaCo O3 single crystal is reported using a scanning superconducting quantum interference device (SQUID) microscope. Stray magnetic flux detected with the scanning SQUID shows typical ferromagnetic behavior in LaCo O3 below Tc ∼85 K, in agreement with previous work on LaCo O3 particles. Analysis of the magnetization of LaCo O3 particle samples clearly shows that the magnetization is inversely proportional to the particle radius, giving the information that the ferromagnetism is restricted within a few unit cell layers from the surface. X-ray photoemission spectroscopy also indicates that the ferromagnetism likely originates from the metallic surface due to hole doping with oxygen chemisorption.

本文言語English
論文番号184426
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
75
18
DOI
出版ステータスPublished - 2007 5月 21

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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