Interfacial characteristics of a Fe3O4/Nb(0.5%):SrTiO3 oxide junction

被引：18

作者：

Kundaliya, Darshan C. ^{[1
]}

Ogale, S. B.

Fu, L. F.

Welz, S. J.

Higgins, J. S.

Langham, G.

Dhar, S.

Browning, N. D.

Venkatesan, T.

机构：

[1] Univ Maryland, Ctr Superconduct Res, Dept Phys, College Pk, MD 20742 USA

[2] Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA

[3] Univ Calif Berkeley, Lawrence Berkeley Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2006年 / 99卷 / 08期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1063/1.2173227

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The temperature dependent Schottky diode characteristics of epitaxial junctions between Nb:SrTiO3 (Nb concentrations: 0.5%) and Fe3O4 are studied. Epitaxial thin films of Fe3O4 were grown on Nb:SrTiO3 substrates by pulsed laser deposition technique. The films and heterointerfaces were characterized by x-ray diffraction, Z-contrast transmission electron microscopy, magnetic susceptibility, four-probe in-plane resistivity, and the temperature dependent junction current-voltage (I-V) characteristics. The nonlinear nature of the characteristics is analyzed within the framework of thermionic emission theory. Junction parameters such as the Schottky barrier height (phi(B)) and ideality factor (eta) are extracted. The temperature evolution of these parameters shows interesting and systematic trends, with remarkable changes near the Verwey transition (T-V=120 K). The magnetic field dependence of I-V characteristic data is also recorded and a spin polarization of similar to 80% is estimated for the magnetite electrode. (C) 2006 American Institute of Physics.

引用

页数：3

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