  Competition between exchange interactions and magnetocrystalline anisotropy
may bring new magnetic states that are of great current interest. An applied
hydrostatic pressure can further be used to tune their balance. In this work we
investigate the magnetization process of a biaxial antiferromagnet in an
external magnetic field applied along the easy axis. We find that the single
metamagnetic transition of the Ising type observed in this material under
ambient pressure transforms under hydrostatic pressure into two transitions, a
first-order spin flop transition followed by a second order transition towards
a polarized ferromagnetic state near saturation. This reversible tuning into a
new magnetic phase is obtained in layered bulk CrSBr at low temperature by
varying the interlayer distance using high hydrostatic pressure, which
efficiently acts on the interlayer magnetic exchange, and is probed by
magneto-optical spectroscopy.
