Das Sujit, Laguta Valentyn, Inzani Katherine, Huang Weichuan, Liu Junjie, Chatterjee Ruchira, McCarter Margaret R, Susarla Sandhya, Ardavan Arzhang, Junquera Javier, Griffin Sinéad M, Ramesh Ramamoorthy
Material Research Centre, Indian Institute of Science, Bangalore 560012, India.
Institute of Physics of the Czech Academy of Sciences, Cukrovarnická 10, 162 00 Prague, Czech Republic.
Nano Lett. 2022 May 25;22(10):3976-3982. doi: 10.1021/acs.nanolett.2c00496. Epub 2022 May 13.
Solid-state materials are currently being explored as a platform for the manipulation of spins for spintronics and quantum information science. More broadly, a wide spectrum of ferroelectric materials, spanning from inorganic oxides to polymeric systems such as PVDF, present a different approach to explore quantum phenomena in which the spins are set and manipulated with electric fields. Using dilute Fe-doped ferroelectric PbTiO-SrTiO superlattices as a model system, we demonstrate intrinsic spin-polarization control of spin directionality in complex ferroelectric vortices and skyrmions. Electron paramagnetic resonance (EPR) spectra show that the spins in the Fe ion are strongly coupled to the local polarization and preferentially aligned perpendicular to the ferroelectric polar axis in this complex vortex structure. The effect of polarization-spin directionality is corroborated by first-principles calculations, demonstrating the variation of the spin directionality with the polar texture and offering the potential for future quantum analogues of macroscopic magnetoelectric devices.
固态材料目前正被探索作为一种用于自旋电子学和量子信息科学中自旋操控的平台。更广泛地说，从无机氧化物到诸如聚偏氟乙烯等聚合物体系的各种铁电材料，提供了一种探索量子现象的不同方法，其中自旋由电场设定和操控。使用稀铁掺杂的铁电PbTiO-SrTiO超晶格作为模型系统，我们展示了在复杂铁电涡旋和斯格明子中对自旋方向性的本征自旋极化控制。电子顺磁共振（EPR）光谱表明，在这种复杂涡旋结构中，铁离子中的自旋与局部极化强烈耦合，并优先垂直于铁电极化轴排列。第一性原理计算证实了极化-自旋方向性的影响，证明了自旋方向性随极性纹理的变化，并为未来宏观磁电装置的量子类似物提供了潜力。
