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

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number184426
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume75
Issue number18
DOIs
Publication statusPublished - 2007 May 21

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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