Squid measurement of the Verwey transition on epitaxial (100) magnetite thin films

被引：7

作者：

Dediu, V.

Arisi, E.

Bergenti, I.

Riminucci, A.

Solzi, M.

Pernechele, C.

Natali, M.

机构：

[1] ISMN, I-40129 Bologna, Italy

[2] Univ Parma, Dipartimento Fis, I-43100 Parma, Italy

[3] CNISM, I-43100 Parma, Italy

[4] ICIS CNR, I-35127 Padua, Italy

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2007年 / 316卷 / 02期

关键词：

epitaxial; thin film; magnetite; electron beam deposition; Verwey transition;

D O I：

10.1016/j.jmmm.2007.03.071

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report results on epitaxial magnetite (Fe3O4) thin films grown by electron beam ablation on (100) MgAl2O4 substrates. At 120K magnetite undergoes a structural and electronic transition, the so-called Verwey transition, at which magnetic and conducting properties of the material change. We observed the Verwey transition on epitaxial films with a thickness of 50nm by comparing zero-field cooling (ZFC) and field cooling (FC) curves measured with a superconducting quantum interference device (SQUID) magnetometer. Observation of the Verwey transition by SQUID measurements in the films is sign of their high crystalline quality. Room temperature ferromagnetism has also been found by magneto-optical Kerr rotation (MOKE) and confirmed by SQUID measurements, with a hysteresis loop showing a coercive field of hundreds of Oe. (c) 2007 Published by Elsevier B.V.

引用

页码：E721 / E723

页数：3

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