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首页> 外文期刊>Physical review >Modulated spin structure responsible for the magnetic-field-induced polarization switching in multiferroic TbMn_2O_5
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Modulated spin structure responsible for the magnetic-field-induced polarization switching in multiferroic TbMn_2O_5

机译：调制自旋结构负责多铁性TbMn_2O_5中的磁场感应极化转换

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摘要

Orthorhombic TbMn_2O_5 (o-TMO) is a well-known multiferroic manganite with the remarkable property of polarization switching at 3 K under a bias magnetic (H) field along the a axis of Pb2_1m. To theoretically account for this outstanding observation, we have proposed a modulated spin structure under the saturated bias H field by considering the relative strength of the three relevant exchange parameters in o-TMO. The proposed modulated structure based on density-functional theory (DFT) calculations is described in terms of the spin angle φ between the neighboring Mn~(4+)-Mn~(3+) spin moments on the a-b plane. We have shown that the computed DFT polarization plotted as a function of φ satisfactorily accounts for the observed H-field-induced polarization switching. We have further theoretically shown that the square of the critical field strength (H_c) needed for the polarization switching is inversely proportional to the degree of the extrinsic magnetoelectric coupling. The computed partial charge density demonstrates that the H-field-induced polarization switching also accompanies with the switching in the sign of the excess valence-electron density.
机译：斜方晶系TbMn_2O_5（o-TMO）是一种众所周知的多铁锰铁矿，在偏磁场（H）沿Pb2_1m轴方向上，在3 K下具有明显的极化转换特性。为了从理论上解释这一出色的观察结果，我们通过考虑o-TMO中三个相关交换参数的相对强度，在饱和偏置H场下提出了一种调制自旋结构。根据密度泛函理论（DFT）计算所提出的调制结构，是根据a-b平面上相邻的Mn〜（4 +）-Mn〜（3+）自旋矩之间的自旋角来描述的。我们已经表明，作为φ的函数绘制的DFT极化计算值令人满意地说明了所观察到的H场引起的极化转换。我们从理论上进一步证明，极化转换所需的临界场强（H_c）的平方与本征磁电耦合的程度成反比。计算出的部分电荷密度表明，H场诱导的极化转换也伴随着过量价电子密度符号的转换。

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