Published: 2D-epitaxial growth of BST on MgO using a SrTiO3/TiO buffer layer

Our paper entitled “Strong Impact of SrTiO3/TiO2 Buffer Layer on Epitaxial Growth and Dielectric Response of Ba0.7Sr0.3TiO3 Thin Films on MgO” has been published in Jpn. J. Appl. Phys. 270-nm-thick (001)-epitaxial BST films were deposited by pulsed laser deposition on STO/TiO2-buffered MgO with a SrRuO3 bottom electrode. It was found that the insertion of SrTiO3/TiO2 buffer layer enabled a two-dimensional growth of BST film, which resulted in the out-of-plane dielectric constant exceeding 1000.

Citation: Jpn. J. Appl. Phys. 57, 0902B1 (2018).

Seminar: Dr. Cosmin Sandu, Dr. Petr Yudin

On Jun. 1, Dr. Cosmin Sandu (Swiss Federal Institute of Technology, Lausanne – EPFL) and Dr. Petr Yudin (Siberian Branch of Russian Academy of Sciences / Academy of Science of the Czech Republic) visited us and lectured on AlScN thin film growth and pyroelectric energy harvesting.

Lecturer Seminar title
Dr. Cosmin Sandu (Swiss Federal Institute of Technology – Lausanne (EPFL)) Growth and Complexion Formation for Ab-normal Oriented Grains in AlScN Thin Films Deposited by Sputtering
Dr. Petr Yudin (Siberian Branch of Russian Academy of Sciences / Academy of Science of the Czech Republic) Pyroelectric Energy Harvesting from a Fluid Source

Published: Influence of PLD conditions on self-assembled PZT nanorods

Our paper entitled “Influence of Deposition Conditions on Self-assembled Growth of Pb(Zr,Ti)O3 Nanorods by Pulsed Laser Deposition at Elevated Oxygen Pressure” has been published in J. Ceram. Soc. Jpn. We found that self-assembled epitaxial PZT nanorods can be grown by pulsed laser deposition (PLD) at an elevated oxygen pressure. The radius of the PZT nanorods was larger at higher substrate temperatures and longer target-substrate distances, which can be explained respectively by the enhanced surface diffusion and shadowing effect of the PLD species.

Citation: J. Ceram. Soc. Jpn. 126, 276-280 (2018).

Published: Crystallographic orientation dependences of sputtering yields

Our paper entitled “Crystallographic Orientation Dependence of the Sputtering Yields of Nickel and Copper for 4-keV Argon Ions Determined using Polycrystalline Targets” has been published in Nucl. Instr. Meth. Phys. Res. B. A novel experimental approach for revealing the crystallographic orientation dependences of sputtering yields was developed. The dependences determined experimentally were in semi-quantitative agreement with the dependences calculated using the extended Onderdelinden model, demonstrating that the non-channeling probability dominantly controls the sputtering yield.

Citation: Nucl. Instr. Meth. Phys. Res. B 418, 34-40 (2018).

Published: Control of Mg content and carrier concentration for Sb-doped Mg2Si

Our paper entitled “Control of Mg Content and Carrier Concentration via Post Annealing under Different Mg Partial Pressures for Sb-doped Mg2Si Thermoelectric Material” has been published in J. Solid State Chem. The annealing process under high Mg partial pressure is an effective way to recover the thermoelectric performance of Mg-deficient Mg2Si-based materials.

Citation: J. Solid State Chem. 258, 93-98 (2018).

Awarded: Hiroharu HIRAI

Hiroharu HIRAI won the award for encouragement of research of The 15th International Conference on Advanced Materials (IUMRS-ICAM 2017) held in Kyoto, Japan for his poster on the crystallographic orientation dependence of sputtering yield of FCC metals.

Awarded: Kazuki OKAMOTO

Kazuki OKAMOTO won the best presentation award of The 37th Electronics Division Meeting of the Ceramic Society of Japan held in Kawasaki, Japan for his poster on the piezoelectric property of PZT nanorods.

Published: Effect of strain on electrocaloric effect

Our paper entitled “Experimental Study of Effect of Strain on Electrocaloric Effect in (001)-epitaxial (Ba,Sr)TiO3 Thin Films” has been published in Jpn. J. Appl. Phys. We experimentally demonstrated that the electrocaloric effect is maximized at around the ferroelectric-to-paraelectric phase transition temperature modified by the strain in the films.

Citation: Jpn. J. Appl. Phys. 56, 10PF15 (2017).

Awarded: Daisuke KATO

Daisuke KATO won Presentation Award of The Annual Meeting of the Thermoelectrics Society of Japan 2017 (TSJ2017) held in Osaka, Japan for his poster “Realization and Thermal Stability Evaluation of Sb-doped Mg2Si with High carrier concentration (translated)”.

Published: Charge screening strategy for ferroelectric domain pattern control

Our paper entitled “Charge Screening Strategy for Domain Pattern Control in Nano-scale Ferroelectric Systems” has been published in Scientific Reports. We experimentally and theoretically demonstrated that the domain pattern in ferroelectric nanorods can be controlled by the charge screening state.

Citation: Sci. Rep. 7, 5236 (2017).

Press release @ Nagoya UniversityEurekAlert!AlphaGalileo, Asia Research NewsScience DailyScience NewslinenanowerkscienmagPhys.orgScience Codex