Magnetic properties of CoFe 2O 4 nanoparticles distributed in a multiferroic BiFeO 3 matrix

Keita Sone, Sho Sekiguchi, Hiroshi Naganuma, Takamichi Miyazaki, Takashi Nakajima, Soichiro Okamura

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

BiFeO 3-CoFe 2O 4 composite thin films were formed on Pt/Ti/SiO 2/Si(100) substrates by chemical solution deposition from a mixed precursor solution. X-ray diffraction and transmission electron microscopy analyses confirmed that CoFe 2O 4 nanoparticles less than 10 nm were uniformly distributed in the BiFeO 3 matrix. The BiFeO 3-CoFe 2O 4 composite films exhibited the same ferroelectric switching charge as BiFeO 3 thin films, although a larger applied electric field was necessary. However, the magnetic properties were significantly improved by incorporation of CoFe 2O 4 nanoparticles into BiFeO 3; a saturated magnetization of 80 emu/cm 3 and a magnetic coercive field of 450 Oe were attained at 300 K. Furthermore, the composite films did not show superparamagnetic behavior in zero-field-cooling and field-cooling measurements, which suggest that the thermal fluctuation of CoFe 2O 4 nanoparticles was suppressed by exchange coupling with BiFeO 3.

Original languageEnglish
Article number124101
JournalJournal of Applied Physics
Volume111
Issue number12
DOIs
Publication statusPublished - 2012 Jun 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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