Magnetic and Magnetomechanical Properties of CoAl$_{\rm x}$Fe$_{2 - {\rm x}}$O$_{4}$for Stress Sensor and Actuator Applications

The effects of substituting Mg on the structural, magnetic, and magnetostrictive properties ofcobalt ferrite have been investigated. Comparable values of lattice parameter were obtained for the Mg-substituted samples. Saturation magnetization continuously decreased with increase inMg concentration. Peak-to-peak magnetostriction amplitude and strain sensitivity had a similar dependence on Mg concentration. Keywords

Section: Introductionmentioning

confidence: 82%

“…Structural, magnetic, and magnetoelastic properties of magnesium substituted cobalt ferrite I. C. Nlebedim, 1,2,a) R. L. Hadimani, 1,2 R. Prozorov, 1,3 and D. C. Jiles…”

mentioning

confidence: 99%

Structural, magnetic, and magnetoelastic properties of magnesium substituted cobalt ferrite

Nlebedim

Hadimani

Prozorov

et al. 2013

“…In general, cation substitution appears to have a stronger effect on magnetocrystalline anisotropy than does heat treatment as deducible by comparing 10 with studies on cation substituted cobalt ferrite. 5,11,12,14 Figure 5 shows the temperature at which the saturation magnetization reached a maximum (regime 2) plotted against the heat treatment temperature. A decreasing trend with heat treatment temperature was observed.…”

Section: Figmentioning

confidence: 99%

“…Both heat treatment and cation substitution can also affect the oxygen stoichiometry which in turn affects the exchange interaction since the cations are indirectly coupled through the oxygen anions in the crystal lattice. Although there have been extensive investigations on improving the properties of cobalt ferrite based materials by cation substitutions, [2][3][4][5][6][7] there has not been a commensurate level of investigation on enhancing the properties by heat treatment. Nevertheless, it has been shown that heat treatment can be used to control the magnetic properties of cobalt ferrite as desired.…”

mentioning

confidence: 99%

Temperature dependence of magnetic properties of heat treated cobalt ferrite

Nlebedim¹,

Melikhov²,

Jiles³

2014

Self Cite

This study demonstrates the effectiveness of heat treatment in optimizing the magneticproperties of cobalt ferrite, compared to other methods such as cation substitution. It also shows how the magnetic properties of the heat treated cobalt ferrite vary under differenttemperature conditions. Saturation magnetization increased more due to heat treatment than due to Zn-substitution; a cation substitution that is known to result in high saturationmagnetization in ferrites. A remarkable observation is that the increase in the saturationmagnetization due to heat treatment was not at the expense of Curie temperature as was often reported for cation substituted materials. The observed variations in the magnetic propertieswere explained on the basis of cation redistribution arising as a result of the heat treatment. KeywordsAmes Laboratory, Heat treatments, Ferrites, Cobalt, Saturation moments, Thermal properties Disciplines Electromagnetics and Photonics CommentsThe following article appeared in Journal of Applied Physics 115 (2014) This study demonstrates the effectiveness of heat treatment in optimizing the magnetic properties of cobalt ferrite, compared to other methods such as cation substitution. It also shows how the magnetic properties of the heat treated cobalt ferrite vary under different temperature conditions. Saturation magnetization increased more due to heat treatment than due to Zn-substitution; a cation substitution that is known to result in high saturation magnetization in ferrites. A remarkable observation is that the increase in the saturation magnetization due to heat treatment was not at the expense of Curie temperature as was often reported for cation substituted materials. The observed variations in the magnetic properties were explained on the basis of cation redistribution arising as a result of the heat treatment. V C 2014 AIP Publishing LLC. [http://dx

“…The need to control the magnetostrictive properties has resulted in several studies including the influence of vacuum sintering, 1 annealing and quenching heat treatment, 2 metal bonding, 3 and cation substitutions. [4][5][6][7] Of these, cation substitution has been found very useful for improving the strain response of cobalt ferrite to applied magnetic field. Substitution of nonmagnetic cations alters the exchange coupling in the ferrite and the site occupancy of the Co 2þ and thereby alters the magnetocrystalline anisotropy and magnetostrictive properties.…”

Section: Introductionmentioning

confidence: 99%

Dependence of magnetomechanical performance of CoGaxFe2−xO4 on temperature variation

Nlebedim

Melikhov

Snyder

et al. 2011

Self Cite

Electronic origin of the negligible magnetostriction of an electric steel Fe1-xSix alloy: A density-functional study J. Appl. Phys. 111, 063911 (2012) Modeling plastic deformation effect on magnetization in ferromagnetic materials J. Appl. Phys. 111, 063909 (2012) Magnetic and calorimetric studies of magnetocaloric effect in La0.7-xPrxCa0.3MnO3 J. Appl. Phys. 111, 07D726 (2012) Converse magnetoelectric effect dependence with CoFeB composition in ferromagnetic/piezoelectric composites J. Appl. Phys. 111, 07C725 (2012) A model-assisted technique for characterization of in-plane magnetic anisotropy J. Appl. Phys. 111, 07E344 (2012) Additional information on J. Appl. Phys. The temperature dependence of the magnetoelastic properties of the CoGa x Fe 2Àx O 4 system (for x ¼ 0.0, 0.2, and 0.4) has been studied. It has been shown that increase in temperature resulted in reduced magnetostrictive hysteresis. For both CoGa 0.2 Fe 1.8 O 4 and CoGa 0.4 Fe 1.6 O 4 , the measured magnetostriction amplitudes were higher at 250 K than at 150 K. It was also shown that the temperature stability of magnetostriction in CoGa 0.2 Fe 1.8 O 4 is higher than that of the other compositions studied which is important for sensor applications. The highest strain sensitivity was obtained for CoGa 0.2 Fe 1.8 O 4 at 250 K. Results demonstrate the possibility of tailoring magnetomechanical properties of the material to suit intended applications under varying temperature conditions.