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Koyama, Tomohiro*; Ieda, Junichi; Chiba, Daichi*
Applied Physics Letters, 116(9), p.092405_1 - 092405_5, 2020/03
Times Cited Count：4 Percentile：26.53(Physics, Applied)Koyama, Tomohiro*; Nakatani, Yoshinobu*; Ieda, Junichi; Chiba, Daichi*
Science Advances (Internet), 4(12), p.eaav0265_1 - eaav0265_5, 2018/12
Times Cited Count：49 Percentile：88.77(Multidisciplinary Sciences)We show that the electric field (EF) can control the magnetic domain wall (DW) velocity in a Pt/Co/Pd asymmetric structure. With the application of a gate voltage, a significant change in DW velocity up to 50 m/s is observed, which is much greater than that observed in previous studies. Moreover, a DW velocity exceeding 100 m/s is clearly modulated. An EF-induced change in the interfacial Dzyaloshinskii-Moriya interaction (DMI) up to several percent is found to be the origin of the velocity modulation. The DMI-mediated velocity change shown here is a fundamentally different mechanism from that caused by EF-induced anisotropy modulation. Our results will pave the way for the electrical manipulation of spin structures and dynamics via DMI control, which can enhance the performance of spintronic devices.
Kurata, Masaki; Nakamura, Kinya*; Yamada, Wataru*; Koyama, Toshiyuki*; Takaki, Tomohiro*; Nanko, Makoto*; Tokunaga, Tatsuya*
no journal, ,
A METI project is ongoing to develop multi scale and multi physics models and databases for elucidating fuel degradation mechanism in severe accident under collaboration among JAEA, CRIEPI, NSSMC, and universities. In JFY2012, technology investigation and model calculation were performed. Base MPFM was developed to study liquefaction condition in mesoscale. Combination between VOF and FLUENT shows high technical potential to simulate candling. A copling among VOF, FLUENT and MARC shows the high technical potential to simulate real scale fuel assembly degradation. As for thermodynamic database, various concerns were extracted from model calculation using conventional database like NUCLEA. In the project, not only developing models and databases but also constructing test facilities are planned. In JFY2012, preliminal tests were performed using conventional test apparatuses and basic concepts for three test facilities to be developed were extracted.
Kurata, Masaki; Nakamura, Kinya*; Tanaka, Masahiro*; Koyama, Toshiyuki*; Takaki, Tomohiro*; Tokunaga, Tatsuya*; Nanko, Makoto*
no journal, ,
The outline and the present status of METI project entitled Advanced Multi-scale Modeling and Experimental Tests on Fuel Degradation in Severe Accident Condition are overviewed.
