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Anisotropic magnetoresistance (AMR) of Cr2Ge2Te6 (CGT), a layeredferromagnetic insulator, is investigated under an applied hydrostatic pressureup to 2 GPa. The easy axis direction of the magnetization is inferred from theAMR saturation feature in the presence and absence of the applied pressure. Atzero applied pressure, the easy axis is along the c-direction or perpendicularto the layer. Upon application of a hydrostatic pressure>1 GPa, the uniaxialanisotropy switches to easy-plane anisotropy which drives the equilibriummagnetization from the c-axis to the ab-plane at zero magnetic field, whichamounts to a giant magnetic anisotropy energy change (>100%). As thetemperature is increased across the Curie temperature, the characteristic AMReffect gradually decreases and disappears. Our first-principles calculationsconfirm the giant magnetic anisotropy energy change with moderate pressure andassign its origin to the increased off-site spin-orbit interaction of Te atomsdue to a shorter Cr-Te distance. Such a pressure-induced spin reorientationtransition is very rare in three-dimensional ferromagnets, but it may be commonto other layered ferromagnets with similar crystal structures to CGT, andtherefore offers a unique way to control magnetic anisotropy.

Pressure-induced spin reorientation transition in layered ferromagnetic insulator Cr2Ge2Te6