Data for Paper "Field-dependent anisotropic magnetic coupling in layered ferromagnetic Fe3-xGeTe2"

The crystal structure of Fe3−xGeTe2 was checked by x-ray diffraction (XRD), which was performed on a Rigaku-TTR3 x-ray diffractometer with high-intensity graphite monochromatized Cu Kα radiation. The chemical composition was carefully determined by energy dispersive x-ray (EDX) spectrometry, which gives that the vacancy of Fe is x ∼ 0.28.

The angle-, temperature-, and field-dependent magnetization measurements were carried out by a Quantum Design vibrating sample magnetometer (SQUID-VSM). In particular, the initial isothermal magnetization with field applied along the c axis and within the ab plane was measured to obtain the magnetic entropy change. Before each measurement, the sample was warmed to room temperature.