期刊
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
卷 40, 期 3, 页码 680-683出版社
ELSEVIER
DOI: 10.1016/j.physe.2007.09.050
关键词
nanostructured ring array; step region in magnetic hysteresis loop; alpha-Fe2O3
alpha-Fe2O3 nanostructured ring arrays with different ring sizes were fabricated by solution-dipping on a colloidal monolayer template. The magnetic properties of the arrays are investigated. An abnormal magnetic step region was observed in the hysteresis loop at room temperature, showing existence of a steady Vortex state in alpha-Fe2O3 ring arrays at room temperature. However, at a low temperature (50 K), the step region disappeared. Also, no step region is found from Fe ring array with the similar morphology to that of alpha-Fe2O3. This is attributed to the weak dependence of hysteresis loop on size and morphology of the single ring for alpha-Fe2O3 at room temperature. (C) 2007 Elsevier B.V. All rights reserved.
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