Magneto-resistance and superparamagnetism in magnetite films on MgO and MgAl2O4

被引：45

作者：

Eerenstein, W ^{[1
]}

Kalev, L ^{[1
]}

Niesen, L ^{[1
]}

Palstra, TTM ^{[1
]}

Hibma, T ^{[1
]}

机构：

[1] Univ Groningen, Ctr Mat Sci, Dept Phys Chem, NL-9747 AG Groningen, Netherlands

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2003年 / 258卷

关键词：

magneto-resistance; spin polarization; superparamagnetism; magnetite; spinel;

D O I：

10.1016/S0304-8853(02)01109-5

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The present study is a comparison of the resistive and magnetic properties of ultrathin epitaxial Fe3O4 films grown on MgO(001) and MgAl2O4(001). Such films on MgO are known to contain anti-phase boundaries, which cause magneto-resistance in these films, an increased resistivity with respect to the bulk and superparamagnetic behaviour for films below 5 nm thickness. Ultrathin films on MgAl2O4 show a very similar behaviour as the resistivity is also increased with respect to the bulk, but is still lower than the resistivity of films grown on MgO. This indicates a larger domain size in the films grown on MgAl2O4. This is supported by the observed magneto-resistance that is larger than for films grown on MgO. Mossbauer spectroscopy analysis of a 1.7 nm thick film on MgO indicates that all magnetic moments in the film are fluctuating, whereas for the film on MgAl2O4 a sextet with a parabolic background is observed. This shows that some domains are small enough for the moment to fluctuate while in larger ones, the moments are fixed; this also indicates that the domains in the film on MgAl2O4 are larger than in the film grown on MgO. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：73 / 76

页数：4

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