標題: Spontaneous magnetization and ferromagnetism in PbSe quantum dots
作者: Jian, WB
Lu, WG
Fang, J
Lan, MD
Lin, JJ
電子物理學系
物理研究所
Department of Electrophysics
Institute of Physics
公開日期: 15-四月-2006
摘要: A high-temperature organic solution approach was applied to prepare crystalline PbSe quantum dots. It is diamagnetic with an atomic susceptibility of similar to-1.0x10(-4) emu/mol Oe for bulk PbSe. The core diamagnetism of bulk PbSe was subtracted from our raw data. While transforming into the nanophase, orbital susceptibility including finite-size corrections to the Landau susceptibility has been observed. A paramagnetic zero-field peak with a large diamagnetic susceptibility in high fields exhibit in the field dependent susceptibility as characteristics of the Landau orbital susceptibility. At low temperatures and fields the paramagnetism dominates the contribution of magnetization of quantum dots while the diamagnetism dominates at high temperatures and fields. All these measurements, showing paramagnetism at low fields, indicate the existence of spontaneous magnetization in the quantum dot. In addition, we have observed profound hysteresis loops implying ferromagnetism among the quantum dots even at room temperature, which is spontaneous magnetization in the quantum dot and of the ferromagnetic order among these quantum dots. (C) 2006 American Institute of Physics.
URI: http://dx.doi.org/10.1063/1.2171130
http://hdl.handle.net/11536/12366
ISSN: 0021-8979
DOI: 10.1063/1.2171130
期刊: JOURNAL OF APPLIED PHYSICS
Volume: 99
Issue: 8
結束頁: 
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