Effect of rare earth substitution in cobalt ferrite bulk materials

Bulai, Georgiana; Diamandescu, L.; Dumitru, Ioanw; Gurlui, Silviu; Féder, M.; Caltun, Ovidiu Florin

doi:10.1016/j.jmmm.2015.04.089

Cited by 116 publications

(56 citation statements)

References 34 publications

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“…This effect in small sized cobalt ferrite nanoparticle is explained on the basis of large surface to volume ratio of nanoparticles, canting of surface spins. [10,13]. Moreover, remanent magnetization also reduces after Dy 3+ doping (Table 1).…”

Section: Vsm Studymentioning

confidence: 91%

“…Magnetization and blocking temperature decrease with substitution of Dy and Gd ions to CoFe 2 O 4 [9]. Three percent doping of Ce, Sm, Er, Gd, Dy and La into CoFe 2 O 4 decreases the specific magnetization, however, Ho and Yb doping increases this parameter [10]. An increase of Gd 3+ concentration from 0 to 10% in the lattice, saturation magnetization of CoFe 2 O 4 decreases from 63 emu/g to 27.26 emu/g [11].…”

Section: Introductionmentioning

confidence: 98%

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Structural and magnetic study of dysprosium substituted cobalt ferrite nanoparticles

Kumar

Srivastava

Singh

et al. 2016

Journal of Magnetism and Magnetic Materials

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Section: Vsm Studymentioning

confidence: 91%

Section: Introductionmentioning

confidence: 98%

Structural and magnetic study of dysprosium substituted cobalt ferrite nanoparticles

Kumar

Srivastava

Singh

et al. 2016

Journal of Magnetism and Magnetic Materials

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“…This can be done by magnetic annealing [11][12][13][14][15], magnetic-field-assisted compaction [16,17], or reaction under uniaxial pressure [18]. Another way to tune magnetostrictive properties of CoFe 2 O 4 is by substitution of the Fe atoms by Mg, Al, Ti, Mn, Ni, Cu, Zn, Ga, Zr, Nb, In, etc., or even rare-earth elements [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Moreover, there is an increasing interest in synthesizing cobalt ferrite from recycled Li-ion batteries to use it in magnetostrictive applications [25,[34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Magnetostriction of CoFe2O4 and Its Role in Magnetoelectric Composites

et al. 2018

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Applications of magnetostrictive materials commonly involve the use of the dynamic deformation, i.e., the piezomagnetic effect. Usually, this effect is described by the strain derivative ∂λ=∂H, which is deduced from the quasistatic magnetostrictive curve. However, the strain derivative might not be accurate to describe dynamic deformation in semihard materials as cobalt ferrite (CFO). To highlight this issue, dynamic magnetostriction measurements of cobalt ferrite are performed and compared with the strain derivative. The experiment shows that measured piezomagnetic coefficients are much lower than the strain derivative. To point out the direct application of this effect, low-frequency magnetoelectric (ME) measurements are also conducted on bilayers CFO=PbðZr; TiÞO 3 . The experimental data are compared with calculated magnetoelectric coefficients which include a measured dynamic coefficient and result in very low relative error (<5%), highlighting the relevance of using a piezomagnetic coefficient derived from dynamic magnetostriction instead of a strain derivative coefficient to model ME composites. The magnetoelectric effect is then measured for several amplitudes of the alternating field H ac , and a nonlinear response is revealed. Based on these results, a trilayer CFO/PbðZr; TiÞO 3 /CFO is made exhibiting a high magnetoelectric coefficient of 578 mV=A (approximately 460 mV=cm Oe) in an ac field of 38.2 kA=m (about 48 mT) at low frequency, which is 3 times higher than the measured value at 0.8 kA=m (approximately 1 mT). We discuss the viability of using semihard materials like cobalt ferrite for dynamic magnetostrictive applications such as the magnetoelectric effect.

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“…for x = 0.025 & 0.050. This can be attributed to the change in magnetocrystalline anisotropy due to the replacement of Fe ions by Dy ions from the octahedral site [41]. Beyond x = 0.050, coercive field (Hc) decreases with Dy content.…”

Section: M-h Hysteresis Loopmentioning

confidence: 99%

Compositional variation of structural, electrical and magnetic properties of Dy substituted Ni–Co spinel ferrite

Kadam

Rajpure

2016

J Mater Sci: Mater Electron

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In the present work nanocrystalline dysprosium substituted Ni 0.8 Co 0.2 Fe 2-x Dy x O 4 (x = 0.00, 0.025, 0.050, 0.075 & 0.1) ferrite system was synthesized by the solution combustion method. The phase formation has been confirmed by Reitveld analysis of XRD patterns, which is a characteristic of spinel ferrite with most intense (311) peak. The bond lengths and site radii of tetrahedral and octahedral sites are found to increase with increase in Dy content. IR measurements showed two prominent bands which are common characteristics of spinel ferrite. The surface morphology shows spherical grains of increasing size with increase in Dy content. The dielectric measurements show the usual dielectric dispersion due to space charge polarization. The electrical resistivity of Ni-Co ferrites is found to increase with Dy content. This can be explained on the basis of formation of DyFeO 3 secondary phase along with spinel lattice. Complex impedance spectra show incomplete semicircles due to the high resistance values at low frequency. Magnetic measurements reveal low coercive field with increase in Dy content. Low coercive fields suggest the use of these materials in data storage and magnetic shielding devices.

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Effect of rare earth substitution in cobalt ferrite bulk materials

Cited by 116 publications

References 34 publications

Structural and magnetic study of dysprosium substituted cobalt ferrite nanoparticles

Structural and magnetic study of dysprosium substituted cobalt ferrite nanoparticles

Dynamic Magnetostriction of CoFe2O4 and Its Role in Magnetoelectric Composites

Compositional variation of structural, electrical and magnetic properties of Dy substituted Ni–Co spinel ferrite

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