Novel behavior in the M–H and field cooled (FC) curves of the MnFe2O4 nanoparticles synthesized by the coprecipitation method

Autor: Ali Mohammadi, Mehdi Vaez-zadeh
Rok vydání: 2013
Předmět:
Zdroj: Applied Physics A. 115:341-345
ISSN: 1432-0630
0947-8396
DOI: 10.1007/s00339-013-7827-8
Popis: MnFe2O4 nanoparticles were prepared by a coprecipitation chemical method. The average size of the obtained nanoparticles was about 30 nm. The hysteresis measured at T=300 K clearly shows ferromagnetic order at room temperature while that measured at T=450 K shows superparamagnetic behavior. The difference in the magnetization curves in the field increasing cycle and field decreasing cycle at higher temperatures (450 K or higher) is very unusual. In this case, a hysteresis in magnetization in higher magnetic fields with an opening up of the magnetization curve was observed. In this work, the effect of temperature and time of application of the applied field on the magnetization behavior was studied.
Databáze: OpenAIRE
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