An Accurate Low Temperature Cation Distribution of Nano Ni-Zn Ferrite Having a Very High Saturation Magnetization
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ORIGINAL PAPER
An Accurate Low Temperature Cation Distribution of Nano Ni-Zn Ferrite Having a Very High Saturation Magnetization J. N. Pavan Kumar Chintala 1 & S. D. Kaushik 2 & M. Chaitanya Varma 3
&
G. S. V. R. K. Choudary 4 & K. H. Rao 5
Received: 8 July 2020 / Accepted: 17 October 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Structural and magnetic properties of nanocrystalline Ni0.65Zn0.35Fe2O4 synthesized by sol-gel method have been analyzed using various characterization techniques. The single-phase spinel structure and crystallite size have been obtained from X-ray diffraction (XRD). The experimentally observed high specific saturation magnetization, 176 emu/g at 10 K, has been discussed in terms of core-shell contributions based on spin canting of nano Ni0.65Zn0.35Fe2O4 with the help of infield Mössbauer study at 5 K. The proposed cation distribution relied upon infield Mössbauer spectra and the Rietveld analysis of the neutron diffraction and XRD data and provides an insight to improve the properties of this material suitable for high-frequency applications. Keywords Ferrite . Saturation magnetization . Cation distribution . Neutron diffraction and Mössbauer
1 Introduction The usefulness of magnetic material in the design of magnetic devices can never be discussed without referring to the importance of saturation magnetization. High saturation magnetization is an imperative parameter in the high frequency magnetic cores, MRI contrast agents, multilayered chip inductors, magnetic hyperthermia materials, etc. The intrinsic high saturation magnetization and electrical conductivity of ferromagnetic metals and their compounds do not favor their utility for high frequency operation of the devices. At this point, mixed ferrites with their superior properties of moderate saturation magnetization and high electrical resistivity occupied a special
* M. Chaitanya Varma [email protected] 1
Department of Physics, PG Courses, Sir C R Reddy College, Eluru, Andhra Pradesh 534002, India
2
UGC-DAE-Consortium for Scientific Research Mumbai Centre, Bhabha Atomic Research Centre, Mumbai 400085, India
3
Department of Electronics and Physics, Institute of Science, GITAM (Deemed to be University), Visakhapatnam 530045, India
4
Department of Physics, Bhavan’s Vivekananda College, Sainikpuri, Secunderabad, Telangana 500094, India
5
Department of Physics, Andhra University, Visakhapatnam 530003, India
place in several applications of various programs. However, the frequency operation of the bulk ferrite contained device has been limited to 100 MHz due to eddy current losses at high frequencies. The problem finds its solution in processing the material in nano form with which the electrical resistivity be increased several times without affecting the magnetic nature. Moreover, meticulous preparation of nanoparticles with careful heating procedures would bring out the desired material with improved properties. The success of producing such a material is possible with the added k
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