Surface Magnetic Anisotropic Energy Gap in Cu2O Nanoparticles

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概要

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• A weak surface magnetic anisotropy was observed in the thermal deviation of the saturation magnetization of Cu2O nanoparticles. The thermal deviation of the saturation magnetization is clearly a departure from the Bloch T3/2 law expected for isotropic systems, signaling the onset of magnetic anisotropy, and is presumably due to the high surface-to-volume ratio of the nanoparticles, and the surface atoms give rise to polarized moments. Here, we assume a uniaxial anisotropy and adopt the Heisenberg ferromagnet model for the applied magnetic field $H_{\text{a}}$-aligned moment-carrying Cu2O nanoparticles, and the surface magnetic anisotropic energy gap $\Delta$ can then be obtained from the fit, indicating that the anisotropic energy gap $\Delta$ can only be revealed at low temperatures.

• Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
• 2008-01-25

著者

• Wu Sheng

  Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan

• Ji Jhong-Yi

  Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan

• Shih Po-Hsun

  Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan

関連論文

• Investigation of Quantum-Confinement Effect in a Single CuO Nanowire
• Surface Magnetic Anisotropic Energy Gap in Cu2O Nanoparticles

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