High Magnetostrictive Cobalt Ferrite for Sensor Applications

Caltun, Ovidiu Florin; Rao, G. S. N.; Rao, K. H.; Rao, B. Bhaskara; Kim, CheolGi; Kim, Chong-Oh; Dumitru, Ioan; Lupu, N.; Chiriac, H.

doi:10.1166/sl.2007.027

Cited by 78 publications

(33 citation statements)

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“…The variations of physical parameters are consistent with the values reported earlier for CMFO system (Caltun et al 2007). It could be seen that for x = 0.1 and 0.3, the parameters are optimum for its use as a magnetostrictive phase.…”

Section: Methodssupporting

confidence: 92%

“…Here, substitution of Mn at A or B site is observed to reduce the anisotropy energy and improve the magnetomechanical coupling of the CoFe 2 O 4 . Therefore, considering virtues of Co and Mn ions in the ferrite system, Co 1.2-x Mn x Fe 1.8 O 4 (CMFO) has been selected as a piezomagnetic phase to form the ME/MD composites (Bhame et al 2006(Bhame et al , 2007Caltun et al 2007;Paulsen et al 2005). As the physical properties of ferrites are dependent on the details of process of synthesis, initially the ferrite system CMFO is synthesized and investigated for its physical and magnetic properties viz.…”

Section: Introductionmentioning

confidence: 99%

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Magnetoelectric and magnetodielectric properties of SBN–CMFO nanocomposites

et al. 2012

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The paper reports synthesis of nanoparticles of Sr 0.5 Ba 0.5 Nb 2 O 6 (SBN) and Co 1.2-x Mn x Fe 1.8 O 4 (CMFO) via ceramic and hydroxide co-precipitation routes, respectively. The nanopowders of SBN-CMFO0.1 (MSBN0.1) and SBN-CMFO0.3 (MSBN0.3) are compacted together to form the desired magnetoelectric/magnetodielectric (ME/MD) composites. The Bi 2 O 3 is used as a sintering aid. The Bi 2 O 3 at three weight percent is observed to cause agglomeration of SBN and CMFO particles and improve the magnetomechanical coupling. The paper reports synthesis, structural and morphological studies on the MSBN composites. The composites are investigated for their dielectric, ME and MD properties. The results on the magnetocapacitance (MC) are observed interesting and could be correctly understood in terms of the stressinduced variation in the dielectric constant. The MC is observed to remain fairly constant between 10 and 500 kHz and possess a useful magnitude of nearly 4 %.

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Section: Methodssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Magnetoelectric and magnetodielectric properties of SBN–CMFO nanocomposites

et al. 2012

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“…Cobalt ferrite is an attractive material, because it offers a combination of semiconducting [ 1 ] and magnetic properties including high coercivity, anisotropy, and magnetostriction. [ 2 ] This results in a vast range of applications in magnetoelectrics, [ 3,4 ] magnetic strain sensors, [ 5 ] resistive switching random access memories, [ 6 ] high density magnetic recording media, [ 4,7 ] and microelectromechanical systems. [ 8 ] In addition, it has a high Kerr rotation in the 400-800 nm range, which is accessible by the common lasers used in the optical industry.…”

Section: Introductionmentioning

confidence: 99%

CoFe₂O₄ and CoFe₂O₄‐SiO₂ Nanoparticle Thin Films with Perpendicular Magnetic Anisotropy for Magnetic and Magneto‐Optical Applications

Erdem

Bingham

Heiligtag

et al. 2016

Adv Funct Materials

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This paper presents an efficient colloidal approach to process CoFe2O4 and SiO2 nanoparticles into thin films for magnetic and magneto‐optical applications. Thin films of varying CoFe2O4‐to‐SiO2 ratios (from 0 to 90 wt%) are obtained by sequential spin coating‐calcination cycles from the corresponding nanoparticle dispersions. Scanning electron microscopy analysis reveals a crack free and nanoparticulate structure of the sintered films with thicknesses of 480–1200 nm. Results from the optical characterization indicate a direct band gap ranging from 2.6 to 3.9 eV depending on the SiO2 content. Similarly, the refractive indices and absorption coefficients are tunable upon SiO2 incorporation. In‐plane measurements of the magnetic properties of the CoFe2O4 films reveal a superparamagnetic behavior with both Co2+ and Fe3+ contributing to the magnetism. Polar Kerr measurements show the presence of a spontaneous magnetization in the CoFe2O4 and CoFe2O4‐SiO2 (with SiO2 < 50 wt%) films, pointing to magnetic anisotropy perpendicular to the substrate. The origin of this effect is attributed to the constrained sintering conditions of the nanoparticulate film and the negative magnetostriction of CoFe2O4.

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“…Also, the substituted cobalt ferrites have been shown to be promising candidate materials for stress and torsion sensor application [1]. Cobalt ferrite, CoFe 2 O 4 , is a wellknown hard magnetic material that has been studied in detail, due to its high coercivity (about 5.40 kOe), and moderate saturation magnetization (about 80 emu/g); as well as its remarkable chemical stability, and mechanical hardness [2,3].…”

Section: Introductionmentioning

confidence: 99%

Crystallographic and Magnetic Properties of Nano-sized Nickel Substituted Cobalt Ferrites Synthesized by the Sol-gel Method

Choi¹,

Lee²,

Kang³

et al. 2014

Journal of Magnetics

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Nano-sized nickel substituted cobalt ferrite powders, Ni x Co 1-x Fe 2 O 4 (0.0 ≤ x ≤ 1.0), were fabricated by the sol-gel method, and their crystallographic and magnetic properties were studied. All the ferrite powders showed a single spinel structure, and behaved ferrimagnetically. When the nickel substitution was increased, the lattice constants and the sizes of particles of the ferrite powders decreased. The Mössbauer absorption spectra of Ni x Co 1-x Fe 2 O 4 ferrite powders could be fitted with two six-line subspectra, which were assigned to a tetrahedral A-site and octahedral B-sites of a typical spinel crystal structure. The increase in values of the magnetic hyperfine fields indicated that the superexchange interaction was stronger, with the increased nickel concentration in Ni x Co 1-x Fe 2 O 4 . This could be explained using the cation distribution, which can be written as,The two values of the saturation magnetization and the coercivity decreased, as the rate of nickel substitution was increased. These decreases could be explained using the cation distribution, the magnetic moment, and the magneto crystalline anisotropy constant of the substituted ions.

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High Magnetostrictive Cobalt Ferrite for Sensor Applications

Cited by 78 publications

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Magnetoelectric and magnetodielectric properties of SBN–CMFO nanocomposites

Magnetoelectric and magnetodielectric properties of SBN–CMFO nanocomposites

CoFe₂O₄ and CoFe₂O₄‐SiO₂ Nanoparticle Thin Films with Perpendicular Magnetic Anisotropy for Magnetic and Magneto‐Optical Applications

Crystallographic and Magnetic Properties of Nano-sized Nickel Substituted Cobalt Ferrites Synthesized by the Sol-gel Method

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High Magnetostrictive Cobalt Ferrite for Sensor Applications

Cited by 78 publications

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Magnetoelectric and magnetodielectric properties of SBN–CMFO nanocomposites

Magnetoelectric and magnetodielectric properties of SBN–CMFO nanocomposites

CoFe2O4 and CoFe2O4‐SiO2 Nanoparticle Thin Films with Perpendicular Magnetic Anisotropy for Magnetic and Magneto‐Optical Applications

Crystallographic and Magnetic Properties of Nano-sized Nickel Substituted Cobalt Ferrites Synthesized by the Sol-gel Method

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CoFe₂O₄ and CoFe₂O₄‐SiO₂ Nanoparticle Thin Films with Perpendicular Magnetic Anisotropy for Magnetic and Magneto‐Optical Applications