TEM and EBSD Study of Fe3O4 Particle Chains Grown and Assembled in External Magnetic Field

J-G Zheng, Y Zhang, Y Zhai, HW Yang
2010 Microscopy and Microanalysis  
One-dimensional magnetic chains composed of nano-sized magnetic particles can be grown and assembled with assistance of an external magnetic field [1, 2] . 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 [3, 4] . Considering only magnetostatic interactions among the
more » ... pheres 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 [2, 4] . Recently, we successfully synthesized Fe 3 O 4 nano-particle chains in an external magnetic field using a self-assembly technique [2]. These magnetic particle chains were further studied using TEM and EBSD techniques. In this paper, we provide solid evidence for the first time to show the preferred particle direction with respected to the chain axis and the external magnetic field.
doi:10.1017/s1431927610058046 fatcat:gjtjsjsmnjfexemorgwvbp5t6q