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Microwave heating is an emerging technology that uses the ability of some liquids and solids to transform electromagnetic energy into heat. We present the results of experimental study of magnetic and structural properties of magnetic nanoparticles fabricated by this technique. Compared with similar nanoparticles fabricated by using a conventional heating, we obtained much smaller grain size (up to 10 nm) and very stable magnetic properties. The hysteresis loops for the samples of the nonoriented assemblies of magnetite particles have a coercive force about 100 Oe with a squareness about 0.4. The superparamagnetic fraction was found in the samples. The particles distribution on the anisotropy fields has a maximum at 200 Oe.