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아래와 같이 콜로퀴움을 개최하오니 많이 참석해 주시기 바랍니다.

4시 20분부터 제1과학관 31214 e+강의실에서 다과를 준비하오니 많은 참석 부탁드립니다


아 래


제목:  Spin transistor : Detection and manipulation of spin transport in semiconductor


연사: 박   병   국 교수님 (KAIST)


일시: 2012년 10월 10(수) 오후4:30


장소: 제1과학관 31214  e+첨단강의실


초록: The discovery of the GMR effect made a huge impact on the storage industry, and also more importantly, triggered new electronics, so-called spintronics. Utilizing electron’s spin degree of freedom as well as making use of their charge states opens the possibility of developing devices that could be smaller, consume less power, and have multi-functionalities. Even though there have been many successes in metal-based spintronic devices such as HDD read heads, sensors and magnetic memories, the semiconductor spintronic device which has multi-functions containing magnetic storage and semiconductor properties has yet to be developed.
In the first part of the talk, the fundamentals and application of spintronic materials and devices are presented. In the second part, I will present the realization of spin transistor of which all three components are preformed within all-semiconductor structure. We fabricated two-dimensional photovoltaic devices where the spin polarized carriers are generated by optical illumination. The transport of the injected spins in the GaAs semiconductor channel was studied using spin Hall effect, in which we observed the precession of the spin-polarized electrons along the semiconductor channel up to tens of microns with a period of an order of micron. The precession of spin orientation is manipulated by external electric field, which is a key element of the spin transistor. We also demonstrate a spin AND logic function using the spin transistor with two gates.



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