Preparation and conversion electron Mössbauer study of Fe3O4/α-Fe2O3composite films

✍ Scribed by Niu, Z. P. ;Wang, Y. ;Li, F. S.

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 378 KB
• Volume: 203
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200622029

✦ Synopsis

Abstract

Fe~3~O~4~ and Fe~3~O~4~/α‐Fe~2~O~3~ composite films have been prepared from a sintered Fe~2~O~3~ target, using an rf magnetron sputtering apparatus with various argon pressures. The phase and magnetic properties of the samples have been characterized by X‐ray‐diffraction (XRD) measurements, conversion electron Mössbauer spectroscopy (CEMS), and a vibrating sample magnetometer (VSM). With the increasing argon pressure during sputtering, the increase of the average center shift of Mössbauer lines indicates the decreasing valency state of Fe ions induced by the enhancement of presumed oxygen loss. An enhanced magnetoresistance (MR) has been found in the Fe~3~O~4~/α‐Fe~2~O~3~ composite film that was prepared under an Ar pressure of 1.0 Pa. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)