Antiferromagnetically spin polarized oxygen observed in magnetoelectric TbMn2O5.
Antiferromagnetically spin polarized oxygen observed in magnetoelectric TbMn2O5.
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DOI：
10.1103/physrevlett.105.087203
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发表时间：
2010-06
影响因子：
8.6
通讯作者：
T. Beale;S. Wilkins;R. Johnson;S. R. Bland;Yves Joly;T. Forrest;D. McMorrow;F. Yakhou;D. Prabhakaran;A. Boothroyd;P. D. Hatton
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文献类型：
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作者：
T. Beale;S. Wilkins;R. Johnson;S. R. Bland;Yves Joly;T. Forrest;D. McMorrow;F. Yakhou;D. Prabhakaran;A. Boothroyd;P. D. Hatton
我们报告了通过共振软 X 射线磁散射直接测量多铁性 TbMn2O5 中氧位点的反铁磁自旋极化。这支持了最新的理论模型，表明氧自旋极化是磁电耦合机制的关键。自旋极化是通过氧 K 边缘处相应反铁磁波矢量处的共振增强衍射信号观察到的。使用 fdmnes 代码，我们准确地重现了实验数据。我们已经确定，共振是通过与方形金字塔 Mn3+ 离子杂化的氧位点上的自旋极化产生的。此外我们还发现Mn3+离子的位置直接影响氧自旋极化。
We report the direct measurement of antiferromagnetic spin polarization at the oxygen sites in the multiferroic TbMn2O5, through resonant soft x-ray magnetic scattering. This supports recent theoretical models suggesting that the oxygen spin polarization is key to the magnetoelectric coupling mechanism. The spin polarization is observed through a resonantly enhanced diffraction signal at the oxygen K edge at the commensurate antiferromagnetic wave vector. Using the fdmnes code we have accurately reproduced the experimental data. We have established that the resonance arises through the spin polarization on the oxygen sites hybridized with the square based pyramid Mn3+ ions. Furthermore we have discovered that the position of the Mn3+ ion directly influences the oxygen spin polarization.