Large enhancement of magnetostriction due to compaction hydrostatic pressure and magnetic annealing in CoFe2O4

Atif, Muhammad; Sato-Turtelli, Reiko; Kriegisch, M.; Größinger, R.; Kübel, Frank; Konegger, Thomas

doi:10.1063/1.3675489

Cited by 80 publications

(42 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…H app. [ 0.5 T), the magnetostriction goes up steadily to approach its [25]. The resulting increase is an indication of the increase in magnetocrystalline anisotropy, which agrees with the observed increase in coercive field in the prepared composites (see Table 1).…”

Section: Resultssupporting

confidence: 85%

Magnetic, dielectric and magnetoelectric properties in (1 − x)Pb(Zr0.52Ti0.48)O3 + (x)CoFe2O4 composites

Atif

Nadeem

Größinger

et al. 2015

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

Multiferroic composites of (1 -x)PbZr 0.52-Ti 0.48 O 3 ? (x)CoFe 2 O 4 with x = 0.0, 0.15, 0.30, 0.45 and 1.0 are synthesized by using ball milling method. Rietveld refinement of XRD patterns confirmed the single phase formation in x = 0.0 and x = 1.0 and two distinct phase formation in x = 0.15, 0.30 and 0.45 composites. SEM images explored the effect of CFO content on the grain connectivity of each phase in the prepared composites.The dielectric properties showed dielectric dispersion with increasing frequency due to interfacial polarization; whereas the dielectric constant is found to increase with increasing CFO content which is attributed to the space charge effect. AC conductivity analysis suggested the mixed polaron hopping type of conduction mechanism. Magnetic hysteresis loops exhibited ferromagnetic like behaviour, indicating the presence of ordered magnetic structure in the prepared composites. Furthermore, with increasing CFO content, the saturation magnetization, magnetostriction and strain sensitivity is found to be increased which in turn have a significant effect on the magnetoelectric coefficient. The maximum magnetoelectric coefficient of 1.45 mV cm -1 Oe -1 is obtained for x = 0.30 composite. Here, the observed variation in the magnetoelectric coefficient is correlated with the microstructure as well as the amount of CFO content.

show abstract

Section: Resultssupporting

confidence: 85%

Magnetic, dielectric and magnetoelectric properties in (1 − x)Pb(Zr0.52Ti0.48)O3 + (x)CoFe2O4 composites

Atif

Nadeem

Größinger

et al. 2015

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

show abstract

“…It has been experimentally shown that magnetostrictive properties of materials derived from cobalt ferrite, including the strain derivatives, are dependent on processing conditions. [25][26][27] In another study, 28 it was suggested that an enhancement of $200% in strain sensitivity may be due to non-stoichiometry which can also be related to the processing conditions. Therefore it is important to discuss the effect of Zn-substitution on the strain derivative of the samples with respect to the unsubstituted sample in the present study (i.e., x ¼ 0).…”

Section: Magnetostrictive Propertiesmentioning

confidence: 99%

Temperature dependence of the structural, magnetic, and magnetostrictive properties of zinc-substituted cobalt ferrite

Nlebedim

Vinitha

Praveen

et al. 2013

Journal of Applied Physics

View full text Add to dashboard Cite

This study presents the effects of substitution of Zn 2+ for Co2+ at low concentrations and the effects of temperature variations on the structural, magnetic, and magnetostrictive properties ofcobalt ferrite. Although the Zn-substituted cobalt ferrite samples, Co1−x Zn xFe2O4 (x = 0.02, 0.04, 0.06, 0.09, and 0.17) did not show observable changes in crystal structure, the magnetic and magnetostrictive properties were strongly affected. The variation in magnetic susceptibilitywith composition can be related to the variations in magnetization, coercive field and magnetocrystalline anisotropy. The changes in coercive field were found to be primarily due to the variations in the magnetocrystalline anisotropy. The effect of magnetocrystalline anisotropyon magnetization was stronger at lower cation concentration than at higher concentrations. The decrease in magnetization around 150 K is attributed to the high magnetocrystalline anisotropyat low temperatures which prevented the maximum applied field of 4 MA/m from causing the saturation of magnetization in the samples. Because the magnetocrystalline anisotropy was determined with the magnetization data using the Law of Approach to saturation magnetization, the reliability of the result was found to decrease with decrease in temperature. Peak-to-peakmagnetostriction amplitude and the strain sensitivity decreased with increase in Znsubstitution. KeywordsAmes Laboratory, Zinc, Magnetic anisotropy, Ferrites, Cobalt, Magnetic fields Disciplines Electromagnetics and Photonics CommentsThe following article appeared in Journal of Applied Physics 113 (2013) This study presents the effects of substitution of Zn 2þ for Co 2þ at low concentrations and the effects of temperature variations on the structural, magnetic, and magnetostrictive properties of cobalt ferrite. Although the Zn-substituted cobalt ferrite samples, Co 1Àx Zn x Fe 2 O 4 (x ¼ 0.02, 0.04, 0.06, 0.09, and 0.17) did not show observable changes in crystal structure, the magnetic and magnetostrictive properties were strongly affected. The variation in magnetic susceptibility with composition can be related to the variations in magnetization, coercive field and magnetocrystalline anisotropy. The changes in coercive field were found to be primarily due to the variations in the magnetocrystalline anisotropy. The effect of magnetocrystalline anisotropy on magnetization was stronger at lower cation concentration than at higher concentrations. The decrease in magnetization around 150 K is attributed to the high magnetocrystalline anisotropy at low temperatures which prevented the maximum applied field of 4 MA/m from causing the saturation of magnetization in the samples. Because the magnetocrystalline anisotropy was determined with the magnetization data using the Law of Approach to saturation magnetization, the reliability of the result was found to decrease with decrease in temperature. Peak-to-peak magnetostriction amplitude and the strain sensitivity decreased with increase in Zn substitution. V C 2013 AIP Publ...

show abstract

“…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].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Magnetostriction of CoFe2O4 and Its Role in Magnetoelectric Composites

et al. 2018

View full text Add to dashboard Cite

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.

show abstract

Large enhancement of magnetostriction due to compaction hydrostatic pressure and magnetic annealing in CoFe2O4

Cited by 80 publications

References 10 publications

Magnetic, dielectric and magnetoelectric properties in (1 − x)Pb(Zr0.52Ti0.48)O3 + (x)CoFe2O4 composites

Magnetic, dielectric and magnetoelectric properties in (1 − x)Pb(Zr0.52Ti0.48)O3 + (x)CoFe2O4 composites

Temperature dependence of the structural, magnetic, and magnetostrictive properties of zinc-substituted cobalt ferrite

Dynamic Magnetostriction of CoFe2O4 and Its Role in Magnetoelectric Composites

Contact Info

Product

Resources

About