Year: 2024

1st alumni meeting of Nagasaki-Yamada lab. was held on Nov. 23rd.

On Jul. 18, Prof. Guorong Li (Shanghai Institute of Ceramics) visited us and lectured on high-entropy ferroelectric ceramics. In addition, Dr. Lei Meng and Dr. Xueyou Yuan gave their seminars.

1) Fabrication and Properties of ABO₃ Ferroelectric Ceramics with A- and B-site disorder for high-energy storage (Prof. Guorong Li)
2) Strong Second-order Nonlinear-polarization in Widegap ZnMgO Thin-films with Li Incorporation (Dr. Lei Meng)
3) Extraordinarily Large Extrinsic Contribution Ratio to Piezo-response in Monoclinic (K, Na)NbO₃ Epitaxial Films (Dr. Xueyou Yuan)

Our collaborative paper with Kyoto University entitled “Ferroelectric Freestanding Hafnia Membranes with Metastable Rhombohedral Structure down to 1-nm-thick” has been published in Nat. Commun. We fabricated stable 1-nm-thick hafnia membranes exhibiting the metastable rhombohedral structure and out-of-plane ferroelectric polarizations as large as 13 μC/cm².

Citation: NC 15, 1055196 (2024).

On Jun. 6, Dr. Alexandros Emborasa (ETH Zurich) visited us and lectured on neuromorphic computing.

Lecturer: Dr. Alexandros Emborasa (ETH Zurich)
Seminar title: Neuromorphic Computing: From Devices to Applications

Our paper entitled “Novel Route for Enhancing Piezoelectricity of Ferroelectric Films: Controlling Nontrivial Polarization States in Pb(Zr, Ti)O₃ Monodomain Superlattice Structure” has been published in ACS Appl. Mater. Interfaces. We found that (111)-epitaxial artificial superlattice thin films consisting of Pb(Zr_0.4Ti_0.6)O₃ and Pb(Zr_0.6Ti_0.4)O₃ can be stabilized into unique monodomain state, which results in the piezoelectric response larger than the typical clamped films with the same chemical compositions.

Citation: ACSAMI 16, 16145 (2024).