Ferromagnetism at the surface of a LaCoO3 single crystal observed using scanning SQUID microscopy

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

doi:10.1103/PhysRevB.75.184426

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Ferromagnetism at the surface of a LaCoO3 single crystal observed using scanning SQUID microscopy

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

DOI 10.1103/PhysRevB.75.184426 · Physical Review B

T1

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Abstract

Evidence for ferromagnetism at the surface of a LaCoO3 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 LaCoO3 below Tc∼85K, in agreement with previous work on LaCoO3 particles. Analysis of the magnetization of LaCoO3 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown