Kim Seung, Nam Jiyeon, Xu Xianghan, Cheong Sang-Wook, Yang In-Sang
Department of Physics, Ewha Womans University, Seoul, Korea.
Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, NJ, USA.
Sci Rep. 2022 Feb 14;12(1):2424. doi: 10.1038/s41598-022-06394-2.
Optical control of the spin degree of freedom is often desired in application of the spin technology. Here we report spin-rotational excitations observed through inelastic light scattering of the hexagonal LuMnO in the antiferromagnetically (AFM) ordered state. We propose a model based on the spin-spin interaction Hamiltonian associated with the spin rotation of the Mn ions, and find that the spin rotations are angularly quantized by 60°, 120°, and 180°. Angular quantization is considered to be a consequence of the symmetry of the triangular lattice of the Mn-ion plane in the hexagonal LuMnO. These angularly-quantized spin excitations may be pictured as isolated flat bubbles in the sea of the ground state, which may lead to high-density information storage if applied to spin devices. Optically pumped and detected spin-excitation bubbles would bring about the advanced technology of optical control of the spin degree of freedom in multiferroic materials.
在自旋技术的应用中，常常需要对自旋自由度进行光学控制。在此，我们报告了在反铁磁（AFM）有序态下通过六方相LuMnO的非弹性光散射观测到的自旋旋转激发。我们基于与Mn离子自旋旋转相关的自旋 - 自旋相互作用哈密顿量提出了一个模型，并发现自旋旋转在角度上以60°、120°和180°进行量子化。角度量子化被认为是六方相LuMnO中Mn离子平面三角晶格对称性的结果。这些角度量子化的自旋激发可以被看作是基态海洋中的孤立扁平气泡，如果应用于自旋器件，可能会导致高密度信息存储。光泵浦和检测到的自旋激发气泡将带来多铁性材料中自旋自由度光学控制的先进技术。
