Exchange bias in UO2/Fe3O4 thin films above the Neel temperature of UO2

被引：10
|
作者：
Tereshina, E. A. [1 ]
Bao, Z. [2 ]
Havela, L. [3 ]
Danis, S. [3 ]
Kuebel, C. [4 ]
Gouder, T. [2 ]
Caciuffo, R. [2 ]
机构：
[1] ASCR, Inst Phys, Prague 18221, Czech Republic
[2] Commiss European Communities, Joint Res Ctr, Inst Transuranium Elements ITU, DE-76125 Karlsruhe, Germany
[3] Charles Univ Prague, Fac Math & Phys, CR-12116 Prague, Czech Republic
[4] KIT, Inst Nanotechnol INT, D-76344 Eggenstein Leopoldshafen, Germany
来源：
APPLIED PHYSICS LETTERS | 2014年 / 105卷 / 12期
关键词：
MAGNETIC-ANISOTROPY; FE3O4; FILMS; MODEL; HYSTERESIS; NANOPARTICLES; BILAYERS; SYSTEMS;
D O I：
10.1063/1.4896635
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Magnetic exchange bias (EB) has been investigated on antiferromagnetic/ferrimagnetic heterostructures consisting of a stoichiometric UO2 film grown epitaxially on a LaAlO3 substrate and covered with highly textured Fe3O4 layers of variable thickness (t(Fe3O4) = 90-700 angstrom). EB values reaching similar to 2.6 kOe were observed at lowest temperatures in UO2/Fe3O4 with the thinnest Fe3O4. Magnetization measurements demonstrate that a remarkably large exchange bias in UO2/Fe3O4 is present at temperatures higher than the bulk Neel temperature of UO2 (T-N = 30.8 K). Our study reveals a complex nature of the effect: we suggest that it is provided both by strong exchange coupling between UO2 and Fe3O4 and by exchange biasing within magnetite (up to 25% of the total effect at 5K in the UO2/Fe3O4 sample with the largest EB). The former can be caused by proximity effects of Fe3O4 on TN combined with a magnetic anisotropy of UO2, persisting above a continuous magnetic-ordering transformation. For magnetite, the results indicate the presence of pinned moments up to 120 K that correlates with the change in the easy magnetization axis of Fe3O4 across the Verwey transition. (C) 2014 AIP Publishing LLC.
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页数：5
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