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High pressure neutron diffraction is employed to investigate the magneticbehavior of CaMn$_2$Bi$_2$ in extreme conditions. In contrast toantiferromagnetic ordering on Mn atoms reported at ambient pressure, ourresults reveal that at high pressure, incommensurate spiral spin order emergesdue to the interplay between magnetism on the Mn atoms and strong spin-orbitcoupling on the Bi atoms: sinusoidal spin order is observed at pressures ashigh as 7.4 GPa. Competing antiferromagnetic order is observed at differenttemperatures in the partially frustrated lattice. This research provides aunique toolbox for conducting experimental magnetic and spin dynamics studieson magnetic quantum materials via high pressure neutron diffraction.

Incommensurate Spiral Spin Order in CaMn$_2$Bi$_2$ observed via High Pressure Neutron Diffraction