TY - JOUR
T1 - Crystallographic inversion-mediated superparamagnetic relaxation in Zn-ferrite nanocrystals
AU - Sai, Ranajit
AU - Arackal, Sarath
AU - Kahmei, R. D.Ralandinliu
AU - Bhat, Navakanta
AU - Yamaguchi, Masahiro
AU - Shivashankar, S. A.
N1 - Funding Information:
The authors are thankful to MNCF (Micro Nano Characterization Facility), CeNSE, IISc, for the instrumentation facility, and ISRO, Dept. of Space, Govt. of India for the partial financial support to the project. It is also supported partially by the DST-JSPS joint bilateral research project.
Publisher Copyright:
© 2020 Author(s).
PY - 2020/1/1
Y1 - 2020/1/1
N2 - 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.
AB - 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.
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U2 - 10.1063/1.5130483
DO - 10.1063/1.5130483
M3 - Article
AN - SCOPUS:85077505801
SN - 2158-3226
VL - 10
JO - AIP Advances
JF - AIP Advances
IS - 1
M1 - 015101
ER -