Optical-acoustic excitation of broadband terahertz antiferromagnetic spin waves. (1st September 2022)

• Record Type: Journal Article
• Authors: Zhang, Jinglin; Ge, Xu; Yu, Shaojie; Yu, Lu; Dong, Diandian; Song, Jianhui; Chen, Yangyi; Li, JiaPu; Luo, Wei; Liang, Shiheng; Otani, Yoshichika; You, Long; Yang, Xiaofei; Zhang, Yue
• Is Part Of: New journal of physics. Volume 24:Number 9(2022)
• Publication Date: 2022-09-01
• Subjects: optical-acoustic transducer -- antiferromagnet -- terahertz spin wave -- Dzyaloshinskii–Moriya interaction; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/ac8db4
• Languages: English
• ISSNs: 1367-2630

Abstract

Abstract: We propose an optical-acoustic means to excite broadband terahertz antiferromagnetic (AFM) spin wave in a metal/insulator/antiferromagnet heterostructure. The AFM spin wave is excited by an ultrafast strain wave triggered by a femtosecond pulsed laser based on photoacoustic conversion. This spin wave comprises an AFM exchange spin wave and a magnetoelastic spin wave. Their dispersion curves are overlapped in a wide frequency range by manipulating the Dzyaloshinskii–Moriya interaction, which is accompanied by lifting the degeneration of the spin-wave modes with opposite chirality. This optical-acoustic excitation of spin waves exploits the laser-induced ultrafast strain waves and avoids the thermal effect from the laser. It paves a way to develop novel AFM devices that can apply for ultrafast information processing and communication.