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强游 教授:Watermelon-Like Magnetic Nanoparticles:Synthesis and Nanomagnetism

发布日期:2016-04-25

报告题目:

Watermelon-Like Magnetic Nanoparticles:Synthesis and Nanomagnetism

报告人:

强游 教授

Department of Physics,University of Idaho, USA

邀请人:

颜世申教授

报告时间:

2013-08-05 15:30

报告地点:

知新楼C1111

报告内容提示:

This presentation talks the study on novel core-shell magnetic nanoparticles (NPs) with unique magnetic properties. Understanding the fundamental physics of antiferromagnetic - ferromagnetic interactions is essential to apply in different applications. Chromium (Cr) doped and undoped core-shell iron/iron-oxide NPs have been synthesized using cluster deposition system and studied with respect to their nanostructures, morphologies, sizes, chemical composition and magnetic properties. The room-temperature magnetic properties of Fe based NPs shows the strong dependence of intra/inter-particle interaction on NP size. The Cr-doped Fe NP shows the origin of sigma-FeCr phase at very low Cr concentration (2 at.%) unlike others reported at high Cr content and interaction reversal from dipolar to exchange interaction. A theoretical model of watermelon is constructed based on the experimental results and core-shell NP system in order to explain the physics of exchange interaction in Cr-doped Fe particles.

报告人简介:

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