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Structural, vibrational and magnetic properties of Cu-substituted Mn0.5Zn0.5Fe2O4 nanoparticles

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Abstract

Nanoparticles of quaternary Mn0.5−xCuxZn0.5Fe2O4 ferrite (x = 0.05, 0.15, 0.25, and 0.35) have been investigated to understand the Cu role in modifying their static and dynamic magnetic properties. The substitution of Cu2+ cation redistributes the other cations too. An attempt has been made to estimate the magnetization of the copper substituted ferrites based on redistributed cations. X-ray diffraction and Raman Spectroscopy investigations reveal that the as-prepared nanoparticles exhibit a single cubic mixed spinel phase. The Raman spectroscopy has established that Fe cations nearly 50% occupying at the tetrahedral site. The distribution of cations in Cu substituted Mn–Zn ferrite nanoparticles first estimated by Raman, Mossbauer, and X-ray photoelectron spectroscopic techniques have been subsequently refined by employing x-ray diffraction peaks intensity ratio method. The size of nearly spherical nanoparticles increases up to 22 nm with Cu2+ concentration. Both magnetization and the spin ordering temperature enhances with an increase in Cu2+ concentration (up to x = 0.25). The observed magnetization values match well with the estimated values. Lowering the line-width is about 620 Oe of FMR signal. The Lande’s g value increases up to 2.21 with an increase in Cu2+ cation concentration suggests that copper enhances magnetic dipolar interactions superexchange interaction; the latter is evidenced by Arrott’s plot also. Magnetocrystalline anisotropy decreases with copper, confirm by the lowering of Canting angle. These nanoparticles can find their applications in devices operating in microwave regions.

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Acknowledgements

The Author acknowledges the Department of Science and Technology, Government of India for financial support vide Reference No: SR/WOS-A/PM-115/2017 (G) under Women Scientist Scheme to carry out this work. The help received from the Indian Institute of Technology Bombay through the SAIF facility for EPR (FMR) measurement. The support from UGC-DAE CSR, Indore for Mössbauer measurements is also thankfully acknowledged. The Micro-Raman measurements were done at Hawaii Institute of Geophysics and Planetology, University of Hawaii, Honolulu, United States. This work supported (research fellowship to Ms Suneetha T) by Indian Institute of Technology Delhi, New Delhi-110016, India.

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  1. Department of Electrical Engineering, Indian Institute of Technology Bombay, Mumbai, 400076, India

    T. Suneetha

  2. Micro and Nano Fabrication Facility, Birla Institute of Technology and Science Pilani, Hyderabad, Telangana, 500078, India

    G. Narayana Rao

  3. Department of Physics, BVRIT Hyderabad College of Engineering for Women, Hyderabad, 500090, India

    T. Ramesh

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Suneetha, T., Rao, G.N. & Ramesh, T. Structural, vibrational and magnetic properties of Cu-substituted Mn0.5Zn0.5Fe2O4 nanoparticles. J Mater Sci: Mater Electron 32, 14420–14436 (2021). https://doi.org/10.1007/s10854-021-06002-5

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