Reciprocal magnetoacoustic interaction in two-dimensional antiferromagnetic semiconductor FePSe 3
The coupling of magnons and phonons in two-dimensional antiferromagnetic materials can achieve low dissipation in magnons, and can process and transmit information at higher frequencies. However, in most cases, the propagation of magnons and phonons in magnon devices requires the maintenance of the overall magnetic order. By locally regulating the magnon-phonon coupling, the magnon properties can be precisely adjusted without affecting the overall magnetic order.
Yu Ting's research group at Wuhan University published a research article titled Strong and reciprocal magneto-phonon effects in a 2D antiferromagnetic semiconductor FePSe 3 on Nanoscale . The research group used laser local control technology to control the coupling strength of the two-dimensional antiferromagnetic semiconductor FePSe 3 at the micrometer scale using laser power (0.25–5 mW) . Combined with the Raman spectrum of the two-dimensional antiferromagnetic material FePSe 3 under a magnetic field, the researchers used local laser heating to achieve spatially localized spin fluctuation control, modulating the magnon-phonon coupling and the phonon energy coupled to the magnon in the irradiated area without changing the overall magnetic order . In addition, the researchers also observed a huge spin-phonon reciprocity interaction. Due to the breaking of time symmetry and the Lorentz force on the localized d-orbital electrons, the out-of-plane magnetic field perpendicular to the sample surface can significantly deflect the polarization axis of the Ag Raman mode .
Figure 1. Comparison of magnetoacoustic coupling between local laser control and temperature control, as well as schematic diagram of local laser control
Figure 2. Reciprocal phonon spin deflection under magnetic field
The researchers' discovery achieved local manipulation without disturbing the overall magnetic order , laying the foundation for high-density magnon integrated circuits, making the two-dimensional antiferromagnet FePSe 3 a unique platform for spin electronics and magnon research under both zero-field and high-field conditions, and also laying an important technical foundation for the design and development of next-generation spin electronic devices based on magnons.
Paper information:
Strong and reciprocal magneto-phonon effects in a 2D antiferromagnetic semiconductor FePSe 3 .
Nanoscale
Yue Sun, Bo Liu, Chee Kwan Gan, Shian Xia, Haoyun Lin, Sheng Liu* and Ting Yu*
DOI: 10.1039/d4nr04743e
