Room Temperature Ferromagnetism of Fe Doped Indium Tin Oxide Based on Dispersed Fe3O4 Nanoparticles

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概要

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• Transmission electron microscopy revealed that Fe3O4 nanoparticles with diameter of ${\approx}200$ nm dispersed in Fe doped indium tin oxide (Fe@ITO) powders exhibiting co-occurrence of room temperature ferromagnetism and superparamagnetism. Although we observed no X-ray diffraction peak from Fe related compounds for Fe0.19@ITO (ITO: In1.9Sn0.1O3) powders, the powders showed both hysteresis loop in field dependent magnetization at 300 K and divergence of zero-field-cooled magnetization from field-cooled magnetization. Scanning transmission electron microscopy with energy dispersive X-ray spectroscopy demonstrated that the nanoparticle with diameter of ${\approx}200$ nm consists of Fe and oxygen. Transmission electron diffraction revealed that crystal structure of the nanoparticle is inverse spinel type Fe3O4. The Fe3O4 crystalline phase by electron diffraction is consistent with the saturation magnetization of 1.3 $\mu_{\text{B}}$/Fe and magnetic anomaly at ${\approx}110$ K observed for the powders.

• Japan Society of Applied Physicsの論文
• 2007-09-25

著者

• MITOME Masanori

  National Institute for Materials Science

• Shishido Toetsu

  Tohoku Univ. Sendai

• Bando Yoshio

  National Institute For Materials Science Advanced Materials Laboratory

• DEGUCHI Hiroyuki

  Kyushu Institute of Technology

• Shishido Toetsu

  Tohoku University, Sendai 980-8577, Japan

• Okada Koichi

  Kyushu Institute of Technology, Kitakyushu 804-8550, Japan

• Kohiki Shigemi

  Kyushu Institute of Technology, Kitakyushu 804-8550, Japan

• Nishi Sachio

  Kyushu Institute of Technology, Kitakyushu 804-8550, Japan

• Shimooka Hirokazu

  Kyushu Institute of Technology, Kitakyushu 804-8550, Japan

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