Journal
IEEE TRANSACTIONS ON MAGNETICS
Volume 43, Issue 6, Pages 3121-3123Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2007.894005
Keywords
ferrimagnetic; magnetite; nanoparticles; spinel
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Magnetite Fe3O4, a spinel structure (Fd3m), has interesting properties such as room-temperature ferrimagnetism, high Curie temperature, and spin polarization. The reasonable electrical conductivity of magnetite opens the possibility of modifying the saturation magnetization by inserting Li+ ions into the structure, in a process similar to that used in conventional lithium batteries. In this study, we have measured the effects A electrochemical lithiation on the structure and magnetic properties of magnetite nanoparticles. A decrease in M,, of up to 75% was observed upon addition of 2 moles of Li per formula unit, along with changes in remanence and coercivity. The insertion of Li+ changes the moment by altering both the valence states and the locations of the Fe ions within the structure, and a model is proposed to explain the observations.
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