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High-Temperature Magnetic Behaviour of 10 % Aluminium-Substituted Cobalt Ferrite

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Abstract

Magnetic studies on aluminum-substituted cobalt ferrite nanoparticles (CoFe1.9Al0.1 O 4) of average particle size ∼20 nm in the broad range of temperature varying from room temperature (300 K) to 900 K has been presented. The temperature dependence of DC magnetization curve exhibits paramagnetic to ferrimagnetic transition at ∼736 K. Zero field cooling and field cooling magnetization measurement shows that the blocking temperature is far above the room temperature. The presence of ferrimagnetic order in the sample has been analyzed by Arrott plot technique for M-H data measured over the temperature range 300–900 K in the magnetic field of ±9 T. The magnetocrystalline anisotropy constant was determined by employing the “law of approach (LA) to saturation” theory. The saturation magnetization, magnetocrystalline anisotropy constant and coercivity are found to decrease with the increase in temperature.

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Acknowledgments

The authors are thankful to the Indian Institute of Technology Guwahati for extending the TEM facility. IISER Bhopal is acknowledged for providing the facilities of high temperature magnetic measurement.

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Authors and Affiliations

  1. Centre for Nanotechnology, Central University of Jharkhand, Ranchi, 835205, India

    Lawrence Kumar

  2. Department of Physics, Mahatma Gandhi Central University, District - East Champaran, Motihari, Bihar, 845401, India

    Pawan Kumar

  3. Indira Gandhi Institute of Medical Sciences, Sheikhpura, Patna, 800014, India

    Mukesh Kumar Zope

  4. Department of Physics, Indian Institute of Technology, Patna, 800013, India

    Manoranjan Kar

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  1. Lawrence Kumar
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Correspondence to Manoranjan Kar.

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Kumar, L., Kumar, P., Zope, M.K. et al. High-Temperature Magnetic Behaviour of 10 % Aluminium-Substituted Cobalt Ferrite. J Supercond Nov Magn 30, 1629–1634 (2017). https://doi.org/10.1007/s10948-016-3965-5

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