Substituted cobalt ferrites for sensors applications

Caltun, Ovidiu Florin; Dumitru, Ioan; Féder, M.; Lupu, N.; Chiriac, H.

doi:10.1016/j.jmmm.2008.04.067

Cited by 95 publications

(28 citation statements)

References 10 publications

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“…Magnetic nanoparticles show unique magnetic properties which include superparamagnetic, spin canting and exchange bias effects. These are strongly influenced by finitesize, shape and surface effects [1][2][3][4][5]. Decreasing the particle size gradually increases the ratio of surface spins to the total number of spins.…”

Section: Introductionmentioning

confidence: 99%

“…Physical and chemical stability of CoFe 2 O 4 makes it suitable for magnetic recording applications that include video, audiotapes and high-digital recording disks [3]. CoFe 2 O 4 has one of the highest magnetostrictive coefficients and is a suitable material for stress and non-contact torque sensors [4]. Magnetic properties of spinel ferrites have been found to be strongly affected by factors that include synthesis method, particle size, composition, microstructure, temperature and applied magnetic field.…”

Section: Introductionmentioning

confidence: 99%

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The effect of temperature on the structure and magnetic properties of Co0.5Ni0.5Fe2O4 spinel nanoferrite

Abdallah

Moyo

Ngema

2015

Journal of Magnetism and Magnetic Materials

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of temperature on the structure and magnetic properties of Co0.5Ni0.5Fe2O4 spinel nanoferrite

Abdallah

Moyo

Ngema

2015

Journal of Magnetism and Magnetic Materials

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“…The magnetization at an applied magnetic field of 80 kOe decreases with increasing temperature from 35.0 emu/g at 4 K to 26.2 emu/g at 393 K. Because of a two-phase ferromagnetic-ferroelectric composition, the maximal magnetization values for the investigated composites are about twice lower than those for CoFe 2 O 4 ferrite (66-83 emu/g [6,7]). …”

Section: Resultsmentioning

confidence: 82%

“…This paper focuses on the studies of microstructure, dielectric, magnetic and magnetoelectric properties of bulk composites based on ferrite CoFe 2 O 4 (CF) and solid state solution of relaxor ferroelectric Pb(Fe 2/3 W 1/3 )O 3 (PFW) and normal ferroelectric PbTiO 3 (PT). CoFe 2 O 4 is a hard magnetic material with the Curie temperature around 790 K, high coercivity, good chemical stability and large magnetostriction [6,7]. Pb(Fe 2/3 W 1/3 )O 3 is a ferroelectric relaxor, sinterable at relatively low temperatures below 1173 K, which shows high dielectric constant and belongs to a narrow group of natural single phase multiferroics [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Multiferroic Cobalt Ferrite-Lead Iron Tungstate Composites

2012

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The paper presents dielectric, magnetic and magnetoelectric properties of multiferroic bulk composites based on CoFe 2 O 4 ferrite and Pb(Fe 2/3 W 1/3 )O 3 relaxor. X-ray diffraction analysis and scanning electron microscopy observations of ceramic samples revealed two-phase composition and fine grained microstructure with uniformly distributed ferromagnetic and ferroelectric phases. Dielectric permittivity measured in a temperature range 218-773 K at frequencies of 10 Hz-2 MHz exhibits high and broad maxima attributed to dielectric relaxation. The hysteresis determined in a temperature range 4-393 K for magnetic field changing from −80 kOe to 80 kOe is typical of hard magnetic materials. Saturation magnetizations and coercivities were found to decrease with increasing temperature. The courses of zero field cooled and field cooled magnetization versus temperature curves measured in the temperature range 4-393 K imply spin glass behavior of the ferrite and antiferromagnetic transition of the relaxor at low temperatures. The ferrite-relaxor composite shows high magnetoelectric voltage coefficient which distinctly increases with increasing frequency of ac magnetic field and is slightly higher for higher ac and dc magnetic fields.

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“…CoFe 2 O 4 (CFO) ferrite is a well-known hard magnetic material with Curie temperature of about 800 K, high coercivity, moderate saturation magnetization and good chemical stability [25][26][27][28]. Due to its large magnetostriction it is a good candidate component of composites with high magnetoelectric effect.…”

Section: Introductionmentioning

confidence: 99%