tailieunhanh - Báo cáo hóa học: " Coherent magnetic semiconductor nanodot arrays"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Coherent magnetic semiconductor nanodot arrays | Wang et al. Nanoscale Research Letters 2011 6 134 http content 6 1 134 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Coherent magnetic semiconductor nanodot arrays I- - 2 1 I- 7 1 2 X - -71 2 2 Yong Wang Faxian Xiu Ya Wang Jin Zou Ward P Beyermann Yi Zhou Kang L Wang Abstract In searching appropriate candidates of magnetic semiconductors compatible with mainstream Si technology for future spintronic devices extensive attention has been focused on Mn-doped Ge magnetic semiconductors. Up to now lack of reliable methods to obtain high-quality MnGe nanostructures with a desired shape and a good controllability has been a barrier to make these materials practically applicable for spintronic devices. Here we report for the first time an innovative growth approach to produce self-assembled and coherent magnetic MnGe nanodot arrays with an excellent reproducibility. Magnetotransport experiments reveal that the nanodot arrays possess giant magneto-resistance associated with geometrical effects. The discovery of the MnGe nanodot arrays paves the way towards next-generation high-density magnetic memories and spintronic devices with low-power dissipation. Introduction Ferromagnet semiconductor hybrid structures attract great attention as artificial materials for semiconductor spintronics since they have magnetic and spin-related functions and excellent compatibility with semiconductor device structures 1 . By embedding magnetic nanocrystals into conventional semiconductors a unique hybrid system can be developed allowing not only utilizing the charge properties but also the spin of carriers which immediately promises next-generation non-volatile magnetic memories and sensors 2 3 . On the other hand spin-injections into the semiconductor can be dramatically enhanced via coherent nanostructures which considerably reduce undesired spin scatterings 4 . Although magnetic hybrid systems such as MnAs GaAs have been .

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