Fig. 3: Strain-dependent vibrational energy of van der Waals (vdW) Fe3GaTe2. | Communications Physics

Fig. 3: Strain-dependent vibrational energy of van der Waals (vdW) Fe3GaTe2.

From: Giant modulation of perpendicular magnetic anisotropy of Fe3GaTe2 at room temperature through electric fields

Fig. 3: Strain-dependent vibrational energy of van der Waals (vdW) Fe3GaTe2.The alternative text for this image may have been generated using AI.

a The mechanisms of electric field (E) induced in-plane piezoelectric compressive and tensile strains and further modulating the vibrational energy of vdW Fe3GaTe2. The compressive and tensile strains derive from the electric-field-induced phase change of Pb(Mg1/3Nb2/3)0.7Ti0.3O3 (PMN-PT) from the rhombohedral to monoclinic phases, which decreases and increases the bonds of the Fe3GaTe2, leading to the modulation of the vibrational energy. b, c Raman spectra of the Fe3GaTe2 flakes on the (001)-oriented and (111)-oriented PMN-PT substrates as a function of E. The solid and dotted black lines label the peak positions at different E, respectively. d, e The corresponding Raman shifts of the Fe3GaTe2 flakes on the (001)-oriented and (111)-oriented PMN-PT substrates. With the increase of E, the Raman peak positions of Fe3GaTe2 flakes increase (blueshift) on the (001)-oriented PMN-PT substrate but decrease (redshift) on the (111)-oriented PMN-PT substrates, indicating the in-plane compressive and tensile strains induced by E, respectively.

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