Mapping magnetic phase diagram in two-dimensional CrSBr using nonlinear optics (Part II)

The air-stable, two-dimensional van der Waals magnet CrSBr, with its high magnetic onset temperature but small magnetic anisotropy, provides an excellent platform for exploring both fundamental quantum physics and potential applications in spintronic devices. A number of temperature scales have been found in CrSBr systems, which stimulates quest of the nature of these temperature scales and the magnetic phases in CrSBr. In this presentation, we will use rotation anisotropy second harmonic generation as a symmetry-sensitive probe, to invesgitate the magnetic phase evolution of CrSBr upon an externally applied magnetic field at a base temperature of 5K, much lower than all the reported temperature scales for CrSBr but is comparable to the temperature scale of the spin wave gap of ~ 30GHz (i.e. ~1.5K). We will show the distinct behaviors along the three orthogonal magnetic field directions aligned along the three crystal axes. Our results suggest a potentially even richer magnetic phase landscape in CrSBr that what is known for now.