Figure 1.

The nature of Fe3O4 nanoparticles. A is the TEM image of Fe3O4 (magnification × 100,000); B is the magnetic curve for Fe3O4 nanoparticles. (σs, saturation magnetization; emu, electromagnetic unit; Oe, Oersted).

Li et al. Nanoscale Research Letters 2013 8:522   doi:10.1186/1556-276X-8-522
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