A
Ashok Kumar
Researcher at Council of Scientific and Industrial Research
Publications - 173
Citations - 4289
Ashok Kumar is an academic researcher from Council of Scientific and Industrial Research. The author has contributed to research in topics: Ferroelectricity & Dielectric. The author has an hindex of 31, co-authored 173 publications receiving 3534 citations. Previous affiliations of Ashok Kumar include National Physical Laboratory & University of Puerto Rico, Río Piedras.
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Impedance spectroscopy of multiferroic Pb Zr x Ti 1 − x O 3 ∕ Co Fe 2 O 4 layered thin films
TL;DR: In this article, the effect of various PZT/CFO configurations having three, five, and nine layers has been systematically investigated by impedance and modulus spectroscopy, and the results showed evidence of three types of conduction process at elevated temperature: (i) low frequency $(l1\phantom{\rule{0.3em}{0ex}}\mathrm{MHz}$ and (ii) midfrequency conductivity $(l10\phantastic{\rule} 0.
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Multifunctional magnetoelectric materials for device applications.
TL;DR: This review article summarises the development of different kinds of multiferroic material: single-phase and composite ceramic, laminated composite and nanostructured thin films.
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Barium zirconate-titanate/barium calcium-titanate ceramics via sol?gel process: novel high-energy-density capacitors
Venkata Sreenivas Puli,Ashok Kumar,Douglas B. Chrisey,Minoru Tomozawa,James F. Scott,James F. Scott,Ram S. Katiyar +6 more
TL;DR: In this paper, the authors have shown that ferroelectric diffuse phase transition (DPT) exists near room temperature in lead-free barium zirconate-titanate/barium calcium titanate (BZT?BCT) ceramics.
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Magnetic switching of ferroelectric domains at room temperature in multiferroic PZTFT
Donald M. Evans,A. Schilling,Ashok Kumar,Ashok Kumar,Dilsom A. Sanchez,Nora Ortega,Miryam Arredondo,Ram S. Katiyar,J. M. Gregg,James F. Scott +9 more
TL;DR: Significant room temperature coupling is demonstrated by monitoring changes in ferroelectric domain patterns induced by magnetic fields in a newly discovered room temperature multiferroic.
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Relaxor-ferroelectric superlattices: high energy density capacitors
Nora Ortega,Ashok Kumar,Ashok Kumar,James F. Scott,James F. Scott,Douglas B. Chrisey,M Tomazawa,Shalini Kumari,Danilo G. Barrionuevo Diestra,Ram S. Katiyar +9 more
TL;DR: The superlattices demonstrate an 'in-built' field in as grown samples at low probe frequency, whereas it becomes more symmetric and centered with increase in the probe frequency system (>1 kHz) which rules out the effect of any space charge and interfacial polarization.