Enhanced spin-polarization by interparticle interaction

• Main Authors: Shu-Wei Chen, 陳書偉
• Other Authors: 李文献
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/97921506105297228767

碩士 === 國立中央大學 === 物理研究所 === 95 === We selected a gas-evaporation method to product Sn nanoparticles. The sample which was characterized using field emission scanning electron microscope, atomic force microscope observations, and x-ray diffraction measurements didn’t obviously constitute in tin oxides analyzed by energy dispersive spectrometer and x-ray diffraction measurements. We demonstrate the spin polarization of Sn fine particles, Sn060302, with an average diameter of 3.3nm and furthermore, the enhanced magnetic property of Sn nanoparticles by reducing interparticle separation is studied as well as the maximum saturation magnetization with 2nm separation because of interparticle interaction. The interaction system is complicated. The major fact of enhanced magnetization is related to the exchange energy and dipole-dipole interaction. According to enhanced magnetization, enhanced remnant, alike domain, and exchange integral effect, the ferromagnetic spin polarization of Sn nanoparticles is observed.