Figure 1.

Structural and magnetic study of ~200-nm-thick FeGe films. (a) Out-of-plane x-ray diffraction showing a preferred (002) orientation of the FeGe film. The inset shows the rocking curve of the FeGe (002) peak. (b) Magnetic phase diagrams for FeGe^L and FeGe^H films. The blue and red shaded areas represent the phase space of the helimagnetic phase for the FeGe^L and FeGe^H films, respectively. A close-up of the phase space around the transition temperature is shown above. (c) Room-temperature magnetisation measurement with the field applied both in-plane and out-of-plane. (d) Temperature dependence of the magnetisation. The zero field-cooled curve is obtained by first cooling the sample in zero field from 300 K down to 10 K before measuring in an out-of-plane field of 20 mT while heating. The high field-cooled data are obtained by first cooling in an applied field of 500 mT down to 10 K, before measuring in an out-of-plane field of 20 mT while heating.