New views on the dissipation in soft magnetic ferrites

Zaag, P. J. van der

doi:10.1016/s0304-8853(98)00732-x

Cited by 121 publications

(79 citation statements)

References 19 publications

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“…In the past report, it was shown that the core loss of NiZn ferrite at high frequency and modest induction level can be reduce substantially by using fine-grained materials in which intragranular domain walls are absent (mono-domain structure) [10], [11]. The similar results were obtained in this study, the core loss at 3 MHz decreased with decrease in the mean grain size.…”

Section: Magnetic Propertiessupporting

confidence: 80%

Relationship between Magnetic Properties and Microstructures of Multilayer Ferrite

Kato

Ono

Matsuo

2009

Trans. Mat. Res. Soc. Japan

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Two kinds of NiCuZn ferrites were prepared through the multilayer process using doctor blade method and the conventional dry pressing method. These have a difference only in a molding process, relationship of the bulk density and the sintering temperature showed almost the same tendency. However, these had large differences in microstructure. The mechanical properties and the magnetic properties of these ferrites were investigated, the results show that the mechanical properties depend on pore sizes and that the magnetic properties depend on grain size distribution.

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Section: Magnetic Propertiessupporting

confidence: 80%

Relationship between Magnetic Properties and Microstructures of Multilayer Ferrite

Kato

Ono

Matsuo

2009

Trans. Mat. Res. Soc. Japan

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“…This critical grain size, L c , for the MnZn ferrites has been reported as 4 µm [5]. In samples of several magnetic materials, with grain size L< L c the magnetic susceptibility results, and coercivity behavior indicated the absence of domain walls in these small grains [6]. The magnetic quality of ferrite films is also mainly dependent on the extrinsic properties, e.g.…”

Section: Introductionmentioning

confidence: 97%

Pinning energy of domain walls in MnZn ferrite films

Calle

Cuellar

Calle

et al. 2007

Phys. Status Solidi (c)

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Mn Zn ferrite films deposited on (100) MgO substrates by rf sputtering technique with different thicknesses ξ in the range of 30-450 nm were studied. AFM images show grain size increase as film thickness increases. Grains with diameters between L ∼ 70 and 700 nm were observed. The mono and multidomain regime in MnZn ferrite films and their effect on the pinning energy of domain walls are observed via Magneto-optical Kerr Effect, MOKE. At ξ ∼ 300 nm, the coercive field, H c , reaches a maximum value of 80 Oe. This result indicates the existence of a multidomain regime associated to a critical grain size, L c . We used the Jiles-Atherton model (JAM) to discuss the experimental hysteresis loops. The k pinning parameter obtained from JAM shows a maximum value of k/µ o = 67 Am 2 for grains with L c ∼ 529 nm. The total energy per unit area E was correlated with k and D. We found a simple phenomenological relationship given by E α kD; where D is the magnetic domain width.

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“…MnZn ferrites, which are capable of combining their high permeability, high resistivity, low power loss and large saturation magnetic flux density, are widely applied as core materials for transformers in switching mode power supplies (SMPS) and DC/DC converters [1][2]. In applications of MnZn ferrites, such as transformers, the temperature of the lowest power loss is controlled to fit the operating temperature.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and temperature dependence of magnetic properties of CuO-added MnZn ferrites

Lan

Zhu

et al. 2011

Rare Metals

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MnZn ferrites with the chemical formula Mn 0.68 Zn 0.25 Fe 2.07 O 4 have been prepared by a conventional ceramic technique. Then, the effects of CuO addition on the microstructure and temperature dependence of magnetic properties of MnZn ferrites were investigated by characterizing the fracture surface micrograph and measuring the magnetic properties over a temperature ranging from 25 to 120°C. The results show that the lattice constant and average grain size increase with the increase of CuO concentration. When the CuO concentration is below 0.07 wt.%, the initial permeability and saturation magnetic flux density increase monotonously, and the temperature of the secondary maximum peak in the curve of initial permeability versus temperature and the lowest power loss shift to a lower temperature with the increase of CuO concentration. However, excessive CuO concentration (>0.07 wt.%) results in abnormal grain growth and porosity increase, which causes the initial permeability and saturation magnetic flux density decrease and the power loss increase at room temperature. Furthermore, the temperature of the secondary maximum peak in the curve of initial permeability versus temperature and the lowest power loss shift to a higher temperature.

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New views on the dissipation in soft magnetic ferrites

Cited by 121 publications

References 19 publications

Relationship between Magnetic Properties and Microstructures of Multilayer Ferrite

Relationship between Magnetic Properties and Microstructures of Multilayer Ferrite

Pinning energy of domain walls in MnZn ferrite films

Microstructure and temperature dependence of magnetic properties of CuO-added MnZn ferrites

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