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• W2566002291 abstract "Superparamagnetic magnetite (Fe3O4) nanoparticles with an average size of 6.5 nm and good monodispersion were synthesized and investigated by X-ray diffraction, Raman spectrometer, transmission electron microscopy and vibrating sample magnetometer. Corresponding low-field magnetoresistance (LFMR) was tested by physical property measurement system. A quite high LFMR has been observed at room temperature. For examples, at a field of 3000 Oe, the LFMR is −3.5%, and when the field increases to 6000 Oe, the LFMR is up to −5.1%. The electron spin polarization was estimated at 25%. This result is superior to the previous reports showing the LFMR of no more than 2% at room temperature. The conduction mechanism is proposed to be the tunneling of conduction electrons between adjacent grains considering that the monodisperse nanocrystals may supply more grain boundaries increasing the tunneling probability, and consequently enhancing the overall magnetoresistance." @default.
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• W2566002291 date "2017-04-01" @default.
• W2566002291 modified "2023-10-17" @default.
• W2566002291 title "Large low-field magnetoresistance of Fe3O4 nanocrystal at room temperature" @default.
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• W2566002291 doi "https://doi.org/10.1016/j.jmmm.2016.12.071" @default.
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