Magnetically induced electric polarization reversal in multiferroic TbMn_2O_5: Terbium spin reorientation studied by resonant x-ray diffraction

R. D. Johnson; C. Mazzoli; S. R. Bland; C-H. Du; P. D. Hatton

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Magnetically induced electric polarization reversal in multiferroic TbMn_2O_5: Terbium spin reorientation studied by resonant x-ray diffraction

机译：多铁性TbMn_2O_5中的磁感应极化反转：通过共振x射线衍射研究b自旋取向

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In multiferroic TbMn_2O_5, 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 TbMn_2O_5, 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 4/ magnetism, which is of great significance in the elusive magnetoelectric mechanisms at play.

机译：在多铁性TbMn_2O_5中，the离子的行为形成了磁电耦合的关键部分。结果是在2 T时磁感应的极化反转。在本文中，我们介绍了在施加磁场下magnetic磁性结构的首次直接测量。与目前对TbMn_2O_5磁性的解释相反，我们表明，在电极化反转时，sub亚晶格采用倾斜的反铁磁结构，其磁矩的大部分平行于a轴。此外，我们为锰3d磁性结构与and 4 /磁性之间的耦合提供了证据，这在起作用的难以捉摸的磁电机制中具有重要意义。

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来源
《Physical review》 |2011年第5期|p.054438.1-054438.4|共4页
作者
R. D. Johnson; C. Mazzoli; S. R. Bland; C-H. Du; P. D. Hatton;
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作者单位

Department of Physics, Durham University, Rochester Building, South Road, Durham DH1 3LE, United Kingdom;

European Synchrotron Radiation Facility, F-38043 Grenoble, France;

Department of Physics, Durham University, Rochester Building, South Road, Durham DH1 3LE, United Kingdom;

Department of Physics, Tamkang University, Tamsui, Taiwan;

Department of Physics, Durham University, Rochester Building, South Road, Durham DH1 3LE, United Kingdom;

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正文语种 eng
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关键词
manganites; antiferromagnetics;

机译：锰矿;反铁磁;

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Magnetically induced electric polarization reversal in multiferroic TbMn_2O_5: Terbium spin reorientation studied by resonant x-ray diffraction

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