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Crystallographic inversion-mediated superparamagnetic relaxation in Zn-ferrite nanocrystals

Sai, R and Arackal, S and Kahmei, R D R and Bhat, N and Yamaguchi, M and Shivashankar, S A (2020) Crystallographic inversion-mediated superparamagnetic relaxation in Zn-ferrite nanocrystals. In: AIP Advances, 10 (1).

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Official URL: https://dx.doi.org/10.1063/1.5130483


Crystallographic inversion induced shift of resonance frequency in zinc ferrite nanoparticle (ZF-NP) samples is studied here. ZF-NP samples were synthesized by a solution-based, low-temperature (<200 °C), microwave-assisted solvothermal (MAS) process. Owing to the far-from-equilibrium processing condition, the MAS process produces a very high degree of crystallographic inversion, δ=0.61, in the as-synthesized nanocrystallites. A rapid thermal annealing (RTA) technique was adopted to tune-down crystallographic inversion without altering the crystallite sizes in annealed samples. The crystal structures, particle shapes, and compositions of the nanocrystalline samples were characterized by XRD, SEM and Raman spectroscopy. The samples are phase-pure, with particle size in the range 8-16 nm and their compositions are stoichiometrically accurate. The resonance phenomena in 1 to 10 GHz frequency range was measured by analyzing the impedance mismatch of a microstrip line with the magnetic material loaded on to it. The RTA protocol enables tuning of the resonance phenomena in the ZF-NC samples above 6 GHz with tunable range of �500 MHz

Item Type: Journal Article
Publication: AIP Advances
Publisher: American Institute of Physics Inc.
Additional Information: Copyright of this article belongs to American Institute of Physics Inc.
Keywords: Crystallite size; Ferrite; Magnetic materials; Nanocrystallites; Nanocrystals; Particle size; Resonance; Temperature, Ferrite nanocrystals; Microwave assisted; Nanocrystalline sample; Processing condition; Rapid thermal annealing (RTA); Resonance frequencies; Resonance phenomena; Superparamagnetic relaxation, Rapid thermal annealing
Department/Centre: Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited: 24 Jan 2020 10:51
Last Modified: 24 Jan 2020 10:51
URI: http://eprints.iisc.ac.in/id/eprint/64366

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