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- 저자 : Kovarik, Libor (검색결과 2 건)
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Coupled Lattice Polarization and Ferromagnetism in Multiferroic NiTiO<sub>3</sub> Thin Films
Varga, Tamas,Droubay, Timothy C.,Kovarik, Libor,Nandasiri, Manjula I.,Shutthanandan, Vaithiyalingam,Hu, Dehong,Kim, Bumsoo,Jeon, Seokwoo,Hong, Seungbum,Li, Yulan,Chambers, Scott A. American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.26
<P>Polarization-induced weak ferromagnetism (WFM) was demonstrated a few years back in LiNbO3-type compounds, MTiO3 (M = Fe, Mn, Ni). Although the coexistence of ferroelectric polarization and ferromagnetism has been demonstrated in this rare multiferroic family before, first in bulk FeTiO3, then in thin-film NiTiO3, the coupling of the two order parameters has not been confirmed Here, we report the stabilization of polar, ferromagnetic NiTiO3 by oxide epitaxy on a LiNbO3 substrate utilizing tensile strain and demonstrate the theoretically predicted coupling between its polarization and ferromagnetism by X-ray magnetic circular dichroism under applied fields. The experimentally observed direction of ferroic ordering in the film is supported by simulations using the phase-field approach. Our work validates symmetry-based criteria and first-principles calculations of the coexistence of ferroelectricity and WFM in MTiO3 transition metal titanates crystallizing in the LiNbO3 structure. It also demonstrates the applicability of epitaxial strain as a viable alternative to high-pressure crystal growth to stabilize metastable materials and a valuable tuning parameter to simultaneously control two ferroic order parameters to create a multiferroic. Multiferroic NiTiO3 has potential applications in spintronics where ferroic switching is used, such as new four-stage memories and electromagnetic switches.</P>
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Estimation of fuel operating ranges of fusion power plants
Slavomir Entler,Jan Horacek,Ondrej Ficker,Karel Kovarik,Michal Kolovratnik,Vaclav Dostal Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.7
The fuel operating ranges of fusion tokamak-based power plants are estimated using the improved engineering breakeven equation. The Lawson criterion equations are derived in the form of a triple product with a focus on engineering breakeven and the subbreakeven operating range. The relationship of fuel parameters to the power plant net efficiency is outlined. Analysis shows that the operating ranges of the suitable fuel parameters form a closed area, the size of which affects the net efficiency of the power plant. The obtained fuel operating ranges confirm the well-known fact that DT fuel is currently the only fusion fuel useable in tokamak-based fusion power plants. It is also shown that the energy utilization of pB fuel is possible in the subbreakeven operating range but is conditioned by the very high efficiency of the power plant equipment. For the utilization of DD, DHe3, and pB fuels, the required magnetic fields are indicatively estimated.
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