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Nakata, Koki; Takayoshi, Shintaro*
Physical Review B, 102(9), p.094417_1 - 094417_11, 2020/09
Times Cited Count：9 Percentile：53.43(Materials Science, Multidisciplinary)Combining the technologies of quantum optics and magnonics [A. Rebei and J. Hohlfeld, Phys. Lett. A 372, 1915 (2008); J. Appl. Phys. 103, 07B118 (2008)] [S. Takayoshi et al., Phys. Rev. B 90, 214413 (2014); S. Takayoshi et al., Phys. Rev. B 90, 085150 (2014)], we find that the circularly polarized laser can dynamically realize the quasiequilibrium magnon Bose-Einstein condensates in insulating ferrimagnets. This provides an access to coherent magnons in the high frequency regime of the order of terahertz.
Yagmur, A.*; Uchida, Kenichi*; Ihara, Kazuki*; Ioka, Ikuo; Kikkawa, Takashi*; Ono, Madoka*; Endo, Junichi*; Kashiwagi, Kimiaki*; Nakashima, Tetsuya*; Kirihara, Akihiro*; et al.
Applied Physics Letters, 109(24), p.243902_1 - 243902_4, 2016/12
Times Cited Count：3 Percentile：14.94(Physics, Applied)Thermoelectric devices based on the spin Seebeck effect (SSE) were irradiated with gamma (
) rays with the total dose of around 3
10
Gy in order to investigate the -radiation resistance of the devices. To demonstrate this, Pt/Ni
Zn
Fe
O
/Glass and Pt/Bi
Y
Fe
O
/Gd
GaO SSE devices were used. We confirmed that the thermoelectric, magnetic, and structural properties of the SSE devices are not affected by the -ray irradiation. This result demonstrates that SSE devices are applicable to thermoelectric generation even in high radiation environments.
; *; Nishizawa, Ichio; Haruyama, Mitsuo; Takase, Misao*;
JAERI-Tech 97-069, 32 Pages, 1998/01
no abstracts in English
Takeshita, Isao
Genshiryoku Shisutemu Nyusu, 7(4), p.30 - 36, 1997/03
no abstracts in English
; Handa, Nuneo; Shiozawa, Kenichi; Hirata, Masaru; *
JAERI-M 90-062, 49 Pages, 1990/03
no abstracts in English
Tsubata, Yasuhiro
no journal, ,
Recent research and development activities in the JAEA-NUCEF are introduced. After explanation of several research equipments in the NUCEF, research activities for partitioning and transmutation of the radioactive waste (group partitioning of liquid waste, ADS, and transmutation fuel cycle for ADS), non-destructive assay and chemical analysis technology are introduced.
Nakata, Koki
no journal, ,
Combining the technologies of quantum optics and magnonics, we find that the circularly polarized laser can dynamically realize the quasiequilibrium magnon Bose-Einstein condensates (BEC). The Zeeman coupling between the laser and spins generates the optical Barnett field. We show that the optical Barnett field develops the total magnetization in insulating ferrimagnets with reversing the local magnetization, which leads to the quasiequilibrium magnon BEC. This laser-induced magnon BEC transition through optical Barnett effect, dubbed the optomagnonic Barnett effect, provides an access to coherent magnons in the high frequency regime of the order of terahertz. The optomagnonic Barnett effect is a key ingredient for the application to spintronics (e.g., spin Josephson effect).
Nakata, Koki
no journal, ,
Combining the technologies of quantum optics and magnonics, we find that the circularly polarized laser can dynamically realize the quasiequilibrium magnon Bose-Einstein condensates (BEC). The Zeeman coupling between the laser and spins generates the optical Barnett field. We show that the optical Barnett field develops the total magnetization in insulating ferrimagnets with reversing the local magnetization, which leads to the quasiequilibrium magnon BEC. This laser-induced magnon BEC transition through optical Barnett effect, dubbed the optomagnonic Barnett effect, provides an access to coherent magnons in the high frequency regime of the order of terahertz. The optomagnonic Barnett effect is a key ingredient for the application to spintronics (e.g., spin Josephson effect).
