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Your search keyword '"Hamai, Takamasa"' showing total 13 results
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13 results on '"Hamai, Takamasa"'

1. Single-component molecular material hosting antiferromagnetic and spin-gapped Mott subsystems

Author

Takagi, Rina, Hamai, Takamasa, Gangi, Hiro, Miyagawa, Kazuya, Zhou, Biao, Kobayashi, Akiko, and Kanoda, Kazushi

Subjects
Condensed Matter - Materials Science
Abstract

We investigated a system based solely on a single molecular species, Cu(tmdt)$_{2}$, accommodating $d$ and ${\pi}$ orbitals within the molecule. $^{13}$C nuclear magnetic resonance measurements captured singlet-triplet excitations of ${\pi}$ spins indicating the existence of a ${\pi}$-electron-based spin-gapped Mott insulating subsystem, which has been hidden by the large magnetic susceptibility exhibited by the $d$ spins forming antiferromagnetic chains. The present results demonstrate a unique hybrid Mott insulator composed of antiferromagnetic and spin-singlet Mott subsystems with distinctive dimensionalities., Comment: 23 pages, 7 figures (including Supplemental Material)

Published
2017
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6. Mechanism of HfO2-FeFET Memory Operation Revealed by Quantitative Analysis of Spontaneous Polarization and Trap Charge

Author

Ichihara, Reika, primary, Higashi, Yusuke, additional, Suzuki, Kunifumi, additional, Kusai, Haruka, additional, Yoshimura, Yoko, additional, Hamai, Takamasa, additional, Kamiya, Yuta, additional, Takahashi, Kota, additional, Matsuo, Kazuhiro, additional, Nakasaki, Yasushi, additional, Miyagawa, Hidenori, additional, Suzuki, Masamichi, additional, Sakuma, Kiwamu, additional, Kamimuta, Yuuichi, additional, and Saitoh, Masumi, additional

Published
2022
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7. Accurate Picture of Cycling Degradation in HfO2-FeFET Based on Charge Trapping Dynamics Revealed by Fast Charge Centroid Analysis

Author

Ichihara, Reika, primary, Higashi, Yusuke, additional, Suzuki, Kunifumi, additional, Takano, Keisuke, additional, Yoshimura, Yoko, additional, Hamai, Takamasa, additional, Takahashi, Kota, additional, Matsuo, Kazuhiro, additional, Nakasaki, Yasushi, additional, Suzuki, Masamichi, additional, Kamimuta, Yuuichi, additional, and Saitoh, Masumi, additional

Published
2021
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13. Recovery of cycling-induced degradation of interfacial SiO2in HfO2-FeFET and its impact on retention characteristics

Author

Schlykow, Viktoria, Suzuki, Kunifumi, Yoshimura, Yoko, Hamai, Takamasa, Sakuma, Kiwamu, Matsuo, Kazuhiro, Suzuki, Masamichi, Saitoh, Masumi, and Ichihara, Reika

Abstract

A detailed understanding of cycling induced degradation of interfacial SiO2in HfO2-FeFET devices is presented. By direct observation of electron trapping to cycling-generated trap sites in various time domains, we found that trap sites disappear over time. This recovery of the degradation has a non-negligible impact on the retention characteristics after cycling.

Published
2024
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