Magnetic ordering in Ni–Cd ferrite

Nath, Suman; Maria, Kazi Hanium; Noor, Saroaut; Sikder, S. S.; Hoque, S. Manjura; Hakim, M. A.

doi:10.1016/j.jmmm.2012.02.023

Cited by 59 publications

(17 citation statements)

References 21 publications

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“…The linear decrease of T C with Zn content is attributed to the progressive weakening of J AB exchange interactions resulting from substitution of non-magnetic Zn in the tetrahedral (A site) occupancy [39,40]. A similar trend in the variation of T C has been observed by some workers in Mg-Zn [18], Li-Zn [41], Ni-Cd [42], Co-Cd [43], and Li-Cd [44] ferrites. A linear least square fitting of the Curie temperature with x gives an empirical relation for the whole Cu 1-x Zn x Fe 2 O 4 system as follows:…”

Section: Temperature Dependence Of Initial Permeabilitysupporting

confidence: 54%

Structural phase transformation and hysteresis behavior of Cu-Zn ferrites

2013

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A series of Cu 1-x Zn x Fe 2 O 4 ferrite (with x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6) compositions were synthesized using the standard solid-state reaction technique. X-ray diffraction was used to study the structure of the above investigated samples. The theoretical and experimental lattice parameters (a th and a exp ) were calculated for each composition. A significant decrease in density and subsequent increase in porosity were observed with increasing Zn content. Curie temperature, T C , has been determined from the temperature dependence of permeability and found to decrease with increasing Zn content. The anomaly observed in the temperature dependence of permeability was attributed to the existence of two structural phases: cubic phase and tetragonal phase. Low-field hysteresis measurements have been performed using a B-H loop trace from which hysteresis parameters have been determined. Coercivity and hysteresis loss were estimated with different Zn contents.

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Section: Temperature Dependence Of Initial Permeabilitysupporting

confidence: 54%

Structural phase transformation and hysteresis behavior of Cu-Zn ferrites

2013

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“…The temperature dependence of the permeability can be explained in terms of the Hopkinson's effect [33][34]. According to the Eq.…”

Section: Resultsmentioning

confidence: 99%

“…However, the rate of decrease of anisotropy constant is faster than that of the saturation magnetization. For this reason, permeability enhances very fast around T c (the ferro/paramagnetic transition temperature of the sample) [33][34]. The initial permeability of ferrites depends on many factors such as reversible domain wall displacement, domain wall bulging as well as microstructural features viz., intragranular porosity, chemical composition, average grain size and the presence of second phase etc [35].…”

Section: Resultsmentioning

confidence: 99%

Complex permeability of Fe-deficient Ni–Cu–Zn ferrites

Khan

Rahman

Sikder

et al. 2013

Journal of Alloys and Compounds

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1-x , where x = 0.00, 0.02, 0.04, 0.06 and 0.08 were prepared by the double sintering ceramic technique. Real part of the initial permeability µ', Curie temperature T c , imaginary part of the initial permeability µ", relative quality factor (Q-factor) of the samples were elaborately discussed as a function of frequency and temperature with increase of Fe-deficiency during the heating and cooling cycles.The temperature dependence of the imaginary part of the complex permeability curves are very interesting to note that there is a peak value of µ" at particular temperature which corresponds to the T c because at this temperature the samples might be in complete spin disorder. This reflects that at T c , a ferrimagnetically ordered state over comes K B T and becomes comparable with µ 0 H where the loss becomes maximum. Results of heating and cooling cycles were found to be very close to each other. The small difference during heating and cooling process might arise due to the thermal hysteresis which is accumulated in this work. In our study, it was noticed that the resonant frequency and T c increases first with the increase in iron deficiency and decreases after it takes a maximum at x = 0.06.

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“…For this reason, permeability enhances very fast around T c (the ferro/paramagnetic transition temperature of the sample Fig. 1) (Hoque et al 2011, Nath et al 2012. The initial permeability of ferrites depends on many factors such as reversible domain wall displacement, domain wall bulging as well as microstructural features viz., intragranular porosity, chemical composition, average grain size and the presence of second phase etc.…”

Section: Resultsmentioning

confidence: 99%