Photoexcited Electron Spin Resonance Properties of CrSrBr

The recent discovery of two-dimensional (2D) magnets offers excellent opportunities for the exploration of low-dimensional magnetism and for the development of novel magnetoelectric, magneto-optic, and spintronic devices. CrSrBr is an air-stable antiferromagnetic semiconductor and gained a great deal of attention in the community for its novel magneto-optical properties. In this work, we present our recent findings on the electron spin resonance (ESR) properties of quasi-2D CrSrBr upon photoexcitation as a function of temperature and time across the magnetic phase transition. We noticed that ESR spectral properties (line shape, g-factor, line width, and signal intensity) are strongly modified upon photoexcitation which infers the tunability of magnetic interactions. Our work demonstrates the unique importance of employing photons in tuning the magnetic properties and interactions of 2D van der Waals magnets.