Department of Physics, University of Durham, Rochester Building, South Road, Durham DH1 3LE, United Kingdom.
Phys Rev Lett. 2010 Aug 20;105(8):087203. doi: 10.1103/PhysRevLett.105.087203. Epub 2010 Aug 18.
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.
我们通过共振软 X 射线磁散射直接测量了多铁性 TbMn2O5 中氧位的反铁磁自旋极化。这支持了最近的理论模型，即氧自旋极化是磁电耦合机制的关键。自旋极化是通过在共格反铁磁波矢处的氧 K 边的共振增强衍射信号观察到的。我们使用 fdmnes 代码准确地再现了实验数据。我们已经确定，共振是通过与基于正方形的 Mn3+离子杂化的氧位上的自旋极化引起的。此外，我们还发现 Mn3+离子的位置直接影响氧自旋极化。
