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High permeability and stress insensitivity of MgCuZn–NiCuZn ferrite composites for microinductor applications

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Abstract

Ferrite composites with ferrimagnetic phases (X) Ni0.35Cu0.05Zn0.6Fe2O4 + (1 − X) Mg0.25Cu0.25Zn0.5Fe2O4 in which X varies from 0.0 to 1.0 were prepared by conventional ceramic double sintering process. The formation of single phase spinel structure was confirmed by X-ray diffraction. Initial permeability measurements on the pure components and their composites were carried out in the temperature range 30–250 °C. These studies show that the composites possess high initial permeability compared to the pure components. The ferrite composite with X = 0.5 showed a high initial permeability of μi = 9,619. This is explained with the help of excess properties of the solid solution. Since, the equimolar composition showed high initial permeability, (μi) stress sensitivity studies in the pure components and their equimolar composition were explored and these studies revealed that the equimolar composition exhibits a stress insensitive property. In view of the high permeability of these composites and stress insensitivity, equimolar composition of these ferrites can be exploited as core material for microinductor applications.

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Acknowledgments

This work was financially supported by Defence Research and Development Organization (DRDO), under the grants ERIP/ER/0103301/M/01, New Delhi, India. The authors acknowledge Prof. A. Varada Rajulu, Department of Polymer Science and Technology, Sri Krishnadevaraya University, Anantapur for his cooperation and encouragement. The authors are thankful to the authorities of Sri Krishnadevaraya University, Anantapur for providing the facilities.

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Authors and Affiliations

  1. Department of Physics, Kakatiya University, Warangal, 506009, India

    N. Varalaxmi

  2. Ceramic Composite Materials Laboratory, Department of Physics, Sri Krishnadevaraya University, Anantapur, 515003, India

    N. Varalaxmi & K. V. Siva kumar

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  1. N. Varalaxmi
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  2. K. V. Siva kumar
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Correspondence to N. Varalaxmi.

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Varalaxmi, N., Siva kumar, K.V. High permeability and stress insensitivity of MgCuZn–NiCuZn ferrite composites for microinductor applications. J Mater Sci: Mater Electron 22, 555–560 (2011). https://doi.org/10.1007/s10854-010-0177-9

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  • DOI: https://doi.org/10.1007/s10854-010-0177-9

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