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. 2016 Mar 21;6:23295. doi: 10.1038/srep23295

Figure 7. Nanoscale expansion process of the local ferromagnetic regions.

Figure 7

(a,b) The temperature dependence of the best-fit parameters fSPM and mSPM obtained for sample A (a) and sample B (b). The red, grey, and white areas indicate ferromagnetic (FM), FM + SPM + paramagnetic (PM), and SPM + PM regions, respectively. (c–e) Schematic diagrams showing the most likely picture of the magnetic states in the Ge0.935Fe0.065 films with zero magnetic field at room temperature (i.e., T = 300 K) (c), TC < T < 300 K (d) and T < TC (e). The small black, red and blue arrows correspond to the magnetic moments of the paramagnetic, ferromagnetic, and antiferromagnetically coupled substitutional Fe atoms, respectively. The red areas indicate ferromagnetic regions. Antiferromagnetically coupled Fe atoms are thought to exist all over the film at temperatures below TC.