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Synthesis and investigation of magnetic properties of substituted ferrite nanoparticles of spinel system Mn1−xZnx[Fe2−yLy]O4
Authors:Tatiana N. Brusentsova  Viatcheslav D. Kuznetsov
Affiliation:1. Department of Physics, University of Central Florida, 32816 Orlando, FL, USA;2. Department of Physics, Mendeleyev University of Chemical Technology of Russia, 125047 Moscow, Russia
Abstract:Superparamagnetic nanoparticles of the spinel ferrite four-element system Mn1−xZnx[Fe2−yLy]O4 (where L:Gd3+, La3+, Ce3+, Eu3+, Dy3+, Er3+,Yb3+) were synthesized by the co-precipitation method. The magnetic moments of the 10 nm diameter nanoparticles were comparable to the ones of Fe3O4 nanoparticles. A comparatively low TC (∼52–72 °C) was observed for some of the compositions. The heating mechanism of the superparamagnetic particles in the AC magnetic field at radiofrequency range is discussed and especially the absence of the hysteresis loop in the M–H curve at room temperature. One possible explanation—spontaneous particle agglomeration—was experimentally verified.
Keywords:Superparamagnetic particle   Ferrite   Magnetic property   Curie temperature   Hysteresis   Heating in AC field
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