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RISS 인기검색어
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- 저자 : Zhang Lunyong (검색결과 3 건)
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Quantitative Process Design of 1-D Crystallization for Pure Melt
Lunyong Zhang,Hongbo Zuo,Dawei Xing,Jiecai Han,Jianfei Sun 대한금속·재료학회 2010 METALS AND MATERIALS International Vol.16 No.5
A 1-D crystallization process has been analyzed for thermal diffusion by solving the Fourier equation. The expressions of thermal fields indicate that the temperature decreases as the crystal grows and the temperature decreases in the solid phase as the crystal growth rate decreases. The trend of temperature variation is the opposite in the liquid phase. Meanwhile the temperature gradient decays along the crystal growth direction in both the solid and liquid phases. An obvious temperature layer gradually appears as the crystal growth rate increases when the crystal grows in an undercooled melt. According to these results, the following guidelines are suggested for the quantitative process design of the 1-D crystallization at a constant crystal growth rate: (1) the heater temperature must be decreased as the crystal grows along a route established using a formula, (2) the linear simplification of temperature distribution is applicable to the process design of crystallization only below a high growth rate limit, and (3) in order to keep the crystal growing in a non-undercooled melt, its growth rate cannot exceed a maximum.
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Li, Yao,Zhang, Lunyong,Zhang, Qinghua,Li, Chen,Yang, Tieying,Deng, Yu,Gu, Lin,Wu, Di American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.23
<P>Recently, perovskite oxide heterostructures have drawn great attention because multiple and complex coupling at the heterointerface may produce novel magnetic and electric phenomena that are not expected in homogeneous materials either in the bulk or in films. In this work, we report for the first time that an emergent giant topological Hall effect (THE), associated with a noncoplanar (NC) spin texture, can be induced in ferromagnetic (FM) La<SUB>0.7</SUB>Sr<SUB>0.3</SUB>MnO<SUB>3</SUB> thin films in a wide temperature range of up to 200 K by constructing La<SUB>0.7</SUB>Sr<SUB>0.3</SUB>MnO<SUB>3</SUB>/SrIrO<SUB>3</SUB> epitaxial heterostructures on (001) SrTiO<SUB>3</SUB> substrates. This THE is not observed in La<SUB>0.7</SUB>Sr<SUB>0.3</SUB>MnO<SUB>3</SUB> single-layer films or La<SUB>0.7</SUB>Sr<SUB>0.3</SUB>MnO<SUB>3</SUB>/SrTiO<SUB>3</SUB>/SrIrO<SUB>3</SUB> trilayer heterostructures, indicating the relevance of the La<SUB>0.7</SUB>Sr<SUB>0.3</SUB>MnO<SUB>3</SUB>/SrIrO<SUB>3</SUB> interface, where the Dzyaloshinskii-Moriya interaction due to strong spin-orbital coupling in SrIrO<SUB>3</SUB> may play a crucial role. The fictitious field associated with THE is independent of temperature in La<SUB>0.7</SUB>Sr<SUB>0.3</SUB>MnO<SUB>3</SUB>/SrIrO<SUB>3</SUB> heterostructures, suggesting that the NC spin texture may be magnetic skyrmions. This work demonstrates the feasibility of using SrIrO<SUB>3</SUB> to generate novel magnetic and transport characteristics by interfacing with other correlated oxides, which might be useful to novel spintronic applications.</P> [FIG OMISSION]</BR>
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Stable pH sensitivity of LaAlO3/SrTiO3 interfacial electronic gas
Dong Yan,Zhang Lunyong,Li Chen,Liu Yanli,Shao Pengfei,Lei Jianming,Wang Rui,Wu Di,Chen Dunjun,Zhang Rong,Zheng Youdou 한국물리학회 2022 Current Applied Physics Vol.34 No.-
Probing pH value is essential for many applications. The request of developing stable and highly sensitive pH sensor with small size are increased recently, this is a challenge to the traditional glass pH sensors. This work investigated the pH sensing performance of the novel two-dimensional electronic gas (2DEG) at the LaAlO3/ SrTiO3 heterostructure interface discovered recently. The experimental results demonstrated that the devices host excellent sensing ability to the pH value of aqueous solutions. Quite stable output current is realized for a given pH value, and the output current is linearly dependent on pH value as required by sensor applications. This work would prompt the application research of LaAlO3/SrTiO3 heterostructure and design of new generation of advanced pH sensors.
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