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Spin-polarization-induced anisotropic magnetoresistance in a twodimensional Rashba system
최원영,김형준,장준연,고경춘,이경진,구현철 한국물리학회 2017 Current Applied Physics Vol.17 No.4
In an asymmetric two-dimensional electron gas system, the Rashba effective field arises due to the intrinsic electric field. Even without ferromagnetism, the Rashba spin splitting acts as a source of spin polarization and affects the transport property of the two-dimensional electron channel. In this Rashba channel, the magnetoresistance is determined by the vector alignment between the applied field and the bias current. In addition, the channel resistance for the parallel alignment between the applied field and the Rashba field is much smaller than that for the antiparallel alignment between them, which surprisingly agrees with the spin polarization induced by the Edelstein effect. This anisotropic magnetoresistance also allows us to estimate the spin polarization in a two-dimensional quantum well channel.
폐 열가소성 플라스틱 탄성체 분쇄물의 자연발화가능성에 관한 연구
박영주 ( Young Ju Park ),이해평 ( Hae Pyeong Lee ),고경춘 ( Kyoung Chun Goh ),엄영섭 ( Young Sup Eom ) 한국안전학회(구 한국산업안전학회) 2016 한국안전학회지 Vol.31 No.1
In this study, we considered the ignition possibility for the shredded thermoplastic elastomer at the fire ground loaded the waste TPE. The average moisture content of the TPE sample was almost 0.33 wt.% at 110℃ and the range of ignition point was 461.9~491.9℃ approximately. In addition, we analyzed the change of weight and calorie the TPE sample according to temperature variations using the TG-DTA analyzer. As a result, the weight loss occurred twice in 250~420℃ and 420~473℃, and we found the second weight loss temperature range was the ignition point of TPE. Also, we conducted the spontaneous ignition tests of TPE for the wet and dry samples and we confirmed that the possibility of spontaneous ignition of TPE was very low. The elapsed time and humidity had little influence on the spontaneous ignition of TPE in this experimental conditions. In conclusion, the spontaneous of the shredded waste TPE in this study.