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arXiv 1010.2678cond-mat.mtrl-sci
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多铁性BiFeO3中室温自旋波的电场控制

Electric-field control of spin waves at room temperature in multiferroic BiFeO3

P. Rovillain, R. de Sousa, Y. Gallais, A. Sacuto, M. A. Méasson, D. Colson, A. Forget, M. Bibes, A. Barthélémy, M. Cazayous

摘要:

为了面对当前基于CMOS的技术之外的挑战,需要新的信息处理范例。Magnonics提出使用自旋波来携带和处理信息,类似于依赖于光波的光子学,具有几个有利的特征,例如在THz范围内的潜在操作和与自旋电子学的良好耦合。已经提出了几种磁振子模拟和数字逻辑器件,其中一些已经得到了验证。正如自旋电子学一样,磁振子学的一个关键问题是控制/写入信息所需的大功率(传统上通过带状线施加的磁场或通过大自旋极化电流的自旋转移来实现)。在这里,我们表明,在BiFeO 3,一种室温磁电材料,自旋波频率(>600 GHz)可以通过电调谐超过30%,在一个非易失性的方式,几乎没有功耗。理论计算表明,这种效应来源于一种与自旋轨道耦合有关的线性磁电效应,这种耦合是由外加电场引起的。我们认为,这些属性使BiFeO 3的自旋波产生,转换和控制在未来的磁振子架构的一个有前途的介质。

英文摘要:

To face the challenges lying beyond current CMOS-based technology, new paradigms for information processing are required. Magnonics proposes to use spin waves to carry and process information, in analogy with photonics that relies on light waves, with several advantageous features such as potential operation in the THz range and excellent coupling to spintronics. Several magnonic analog and digital logic devices have been proposed, and some demonstrated. Just as for spintronics, a key issue for magnonics is the large power required to control/write information (conventionally achieved through magnetic fields applied by strip lines, or by spin transfer from large spin-polarized currents). Here we show that in BiFeO3, a room-temperature magnetoelectric material, the spin wave frequency (>600 GHz) can be tuned electrically by over 30%, in a non-volatile way and with virtually no power dissipation. Theoretical calculations indicate that this effect originates from a linear magnetoelectric effect related to spin-orbit coupling induced by the applied electric field. We argue that these properties make BiFeO3 a promising medium for spin wave generation, conversion and control in future magnonics architectures.

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