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Local electric-field control of multiferroic spin-spiral domains in TbMnO 3
npj Quantum Materials ( IF 5.7 ) Pub Date : 2020-11-18 , DOI: 10.1038/s41535-020-00289-z
Peggy Schoenherr , Sebastian Manz , Lukas Kuerten , Konstantin Shapovalov , Ayato Iyama , Tsuyoshi Kimura , Manfred Fiebig , Dennis Meier

Spin-spiral multiferroics exhibit a magnetoelectric coupling effects, leading to the formation of hybrid domains with inseparably entangled ferroelectric and antiferromagnetic order parameters. Due to this strong magnetoelectric coupling, conceptually advanced ways for controlling antiferromagnetism become possible and it has been reported that electric fields and laser pulses can reversibly switch the antiferromagnetic order. This switching of antiferromagnetic spin textures is of great interest for the emergent field of antiferromagnetic spintronics. Established approaches, however, require either high voltages or intense laser fields and are currently limited to the micrometer length scale, which forfeits the technological merit. Here, we image and control hybrid multiferroic domains in the spin-spiral system TbMnO3 using low-temperature electrostatic force microscopy (EFM). First, we show that image generation in EFM happens via surface screening charges, which allows for probing the previously hidden magnetically induced ferroelectric order in TbMnO3 (PS = 6 × 10−4 C/m2). We then set the antiferromagnetic domain configuration by acting on the surface screening charges with the EFM probe tip. Our study enables detection of entangled ferroelectric and antiferromagnetic domains with high sensitivity. The spatial resolution is limited only by the physical size of the probe tip, introducing a pathway towards controlling antiferromagnetic order at the nanoscale and with low energy.



中文翻译:

TbMnO 3中多铁性自旋螺旋结构域的局部电场控制

自旋螺旋多铁磁体表现出磁电耦合效应,导致形成具有不可分纠缠的铁电和反铁磁有序参数的混合畴。由于这种强的磁电耦合,控制反铁磁性的概念上先进的方法成为可能,并且据报道,电场和激光脉冲可以可逆地切换反铁磁顺序。反铁磁自旋结构的这种转换对于反铁磁自旋电子学的新兴领域非常感兴趣。然而,已建立的方法需要高压或强激光场,并且目前限于微米长度范围,这丧失了技术优点。在这里,我们成像和控制自旋螺旋系统TbMnO 3中的混合多铁性域使用低温静电力显微镜(EFM)。首先,我们证明EFM中的图像生成是通过表面屏蔽电荷发生的,这可以探测TbMnO 3中先前隐藏的磁感应铁电有序(P S  = 6×10 -4  C / m 2)。然后,我们通过使用EFM探针尖端作用于表面筛选电荷来设置反铁磁畴结构。我们的研究能够以高灵敏度检测纠缠的铁电和反铁磁畴。空间分辨率仅受探针尖端的物理尺寸的限制,从而在纳米级以低能量引入了控制反铁磁顺序的途径。

更新日期:2020-11-18
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