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Harii, Kazuya*; Umeda, Maki; Arisawa, Hiroki*; Hioki, Tomosato*; Sato, Nana; Okayasu, Satoru; Ieda, Junichi
Journal of the Physical Society of Japan, 92(7), p.073701_1 - 073701_4, 2023/07
Times Cited Count：1 Percentile：61.99(Physics, Multidisciplinary)Oyanagi, Koichi*; Gomez-Perez, J. M.*; Zhang, X.-P.*; Kikkawa, Takashi*; Chen, Y.*; Sagasta, E.*; Chuvilin, A.*; Hueso, L. E.*; Golovach, V. N.*; Sebastian Bergeret, F.*; et al.
Physical Review B, 104(13), p.134428_1 - 134428_14, 2021/10
Times Cited Count：14 Percentile：77.64(Materials Science, Multidisciplinary)
O
/YIG structureQi, J.*; Hou, D.*; Chen, Y.*; Saito, Eiji; Jin, X.*
Journal of Magnetism and Magnetic Materials, 534, p.167980_1 - 167980_6, 2021/09
Times Cited Count：1 Percentile：7.92(Materials Science, Multidisciplinary)O thin filmsQin, J.*; Hou, D.*; Chen, Y.*; Saito, Eiji; Jin, X.*
Journal of Magnetism and Magnetic Materials, 501, p.166362_1 - 166362_4, 2020/05
Times Cited Count：4 Percentile：26.39(Materials Science, Multidisciplinary)Chen, Y.*; Shiomi, Yuki*; Qiu, Z.*; Niizeki, Tomohiko*; Umeda, Maki*; Saito, Eiji
Scientific Reports (Internet), 9, p.19052_1 - 19052_8, 2019/12
Times Cited Count：0 Percentile：0(Multidisciplinary Sciences) and CrGeTeIto, Naohiro*; Kikkawa, Takashi*; Barker, J.*; Hirobe, Daichi*; Shiomi, Yuki*; Saito, Eiji
Physical Review B, 100(6), p.060402_1 - 060402_6, 2019/08
Times Cited Count：43 Percentile：88.83(Materials Science, Multidisciplinary)Hou, D.*; Qiu, Z.*; Saito, Eiji
NPG Asia Materials, 11, p.35_1 - 35_6, 2019/07
Times Cited Count：40 Percentile：84.83(Materials Science, Multidisciplinary)
-FeO/NiO/Pt epitaxial stacksDong, B.-W.*; Baldrati, L.*; Schneider, C.*; Niizeki, Tomohiko*; Ramos, R.*; Ross, A.*; Cramer, J.*; Saito, Eiji; Kl
ui, M.*
Applied Physics Letters, 114(10), p.102405_1 - 102405_5, 2019/03
Times Cited Count：11 Percentile：49.82(Physics, Applied)Hotta, Takashi; Moraghebi, M.*; Feiguin, A.*; Moreo, A.*; Yunoki, Seiji*; Dagotto, E.*
Physical Review Letters, 90(24), p.247203_1 - 247203_4, 2003/06
Times Cited Count：83 Percentile：91.22(Physics, Multidisciplinary)Novel ground-state spin structures in undoped and doped manganites are here investigated based on the orbital-degenerate double-exchange model, by using mean-field and numerical techniques. In undoped manganites, a new antiferromagnetic (AFM) state, called the E-type phase, is found adjacent in parameter space to the A-type AFM phase. Its structure is in agreement with recent experimental results. This insulating E-AFM state is competing with a ferromagnetic metallic phase as well, suggesting that large magneto-resistant effects could exist even in undoped manganese oxides. For doped layered manganites, the phase diagram includes another new AFM phase of the 
-type. Experimental signatures of the new phases are discussed.
Hotta, Takashi
Physical Review B, 67(10), p.104428_1 - 104428_8, 2003/03
Times Cited Count：21 Percentile：68.23(Materials Science, Multidisciplinary)The existence of a novel metal-insulator transition in the ferromagnetic state of models for undoped manganites is here discussed using numerical techniques applied to the 
-orbital degenerate Hubbard model tightly coupled with Jahn-Teller distortions. The ground-state phase diagram is presented in the plane defined by the electron-phonon coupling 
and Coulomb interaction 
. In contrast to the standard one-band Hubbard model for cuprates, the metallic phase is found to exist for finite values of both and in the present -orbital Hubbard model even at half-filling, due to the Fermi-surface topology which is incompatible with the staggered orbital ordering concomitant to the insulating phase. Based on the present results, a possible scenario for Colossal Magneto-Resistive effect is discussed in undoped manganites.
Ieda, Junichi
no journal, ,
no abstracts in English
Nakata, Koki
no journal, ,
Recently, there has been a growing interest in non-Hermitian quantum mechanics. However, the non-Hermitian extension of the Casimir effect and the application to spintronics remain missing ingredients. Here we fill this gap. By developing a magnonic analog of the Casimir effect into non-Hermitian systems, we show that this non-Hermitian Casimir effect of magnons is enhanced as the Gilbert damping constant (i.e., the energy dissipation rate) increases. When the damping constant exceeds a critical value, the non-Hermitian Casimir effect of magnons exhibits an oscillating behavior, including a beating one, as a function of the film thickness and is characterized by the exceptional point. Our result suggests that energy dissipation serves as a key ingredient of Casimir engineering.
Nakata, Koki
no journal, ,
Recently, there has been a growing interest in non-Hermitian quantum mechanics. However, the non-Hermitian extension of the Casimir effect and the application to spintronics remain missing ingredients. Here we fill this gap. By developing a magnonic analog of the Casimir effect into non-Hermitian systems, we show that this non-Hermitian Casimir effect of magnons is enhanced as the Gilbert damping constant (i.e., the energy dissipation rate) increases. When the damping constant exceeds a critical value, the non-Hermitian Casimir effect of magnons exhibits an oscillating behavior, including a beating one, as a function of the film thickness and is characterized by the exceptional point. Our result suggests that energy dissipation serves as a key ingredient of Casimir engineering.
