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By means of powder neutron diffraction we investigate changes in the magneticstructure of the coplanar non-collinear antiferromagnet Mn$_3$Ge caused by anapplication of hydrostatic pressure up to 5\phantom{ }GPa. At ambientconditions the kagom\'e layers of Mn atoms in Mn$_3$Ge order in a triangular120$^{\circ}$ spin structure. Under high pressure the spins acquire a uniformout-of-plane canting, gradually transforming the magnetic texture to anon-coplanar configuration. With increasing pressure the canted structure fullytransforms into the collinear ferromagnetic one. We observed that magneticorder is accompanied by a noticeable magnetoelastic effect, namely, spontaneousmagnetostriction. The latter induces an in-plane magnetostrain of the hexagonalunit cell at ambient pressure and flips to an out-of-plane strain at highpressures in accordance with the change of the magnetic structure.

Gradual pressure-induced change in the magnetic structure of the non-collinear antiferromagnet Mn$_3$Ge