Magnetically induced electric polarization reversal in multiferroic TbMn2O5: Terbium spin reorientation studied by resonant x-ray diffraction

被引：10
|
作者：
Johnson, R. D. [1 ]
Mazzoli, C. [2 ]
Bland, S. R. [1 ]
Du, C-H. [3 ]
Hatton, P. D. [1 ]
机构：
[1] Univ Durham, Dept Phys, Durham DH1 3LE, England
[2] European Synchrotron Radiat Facil, F-38043 Grenoble, France
[3] Tamkang Univ, Dept Phys, Tamsui, Taiwan
来源：
PHYSICAL REVIEW B | 2011年 / 83卷 / 05期
基金：
英国工程与自然科学研究理事会;
关键词：
D O I：
10.1103/PhysRevB.83.054438
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In multiferroic TbMn2O5, the behavior of the terbium ions forms a crucial part of the magnetoelectric coupling. The result is a magnetically induced reversal of the electric polarization at 2 T. In this article we present the first direct measurement of the terbium magnetic structure under applied magnetic fields. Contrary to the current interpretation of the magnetic properties of TbMn2O5, we show that upon the electric polarization reversal the terbium sublattice adopts a canted antiferromagnetic structure with a large component of magnetic moment parallel to the a axis. Furthermore, we provide evidence for a coupling between the manganese 3d magnetic structure and the terbium 4f magnetism, which is of great significance in the elusive magnetoelectric mechanisms at play.
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页数：4
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