时间: July 5, 15:00-16:00

地点：田家炳楼203

邀请者：翟亚

摘要：

One-dimensional magnetic chains composed of nano-sized magnetic particles can be grown and assembled with assistance of an external magnetic field . These low dimensional magnetic structures show anisotropy not only in their shape, but also their magnetic properties. The chain of spheres model has been used commonly to explain the magnetization reversal and several different modes of magnetization reversal have been proposed . Considering only magnetostatic interactions among the spheres without any exchange interactions, magnetization reversal in an applied field was assumed to proceed by a fanning mechanism. However, there has not been any crystallographic evidence to support this assumption. Recently, we successfully synthesized Fe₃O₄  nano-particle chains in a magnetic field using a self-assembly technique and we provide solid evidence for the first time to show the preferred particle direction with respected to the chain axis and the external synthesis magnetic field by TEM and EBSD techniques.

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