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您的检索式：作者名="Xiaping Zeng"
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| 1 | Structure and magneto-electrical properties of Fe-C films prepared by magnetron sputtering显示文摘Fe-doped amorphous Fe x C 1 x granular films were prepared on n-Si(100) substrates by d.c.magnetron sputtering.The structural properties of Fe x C 1 x films were investigated by X-ray diffraction(XRD),atomic force microscope(AFM) and Raman spectroscopy.The results show that the iron and carbon of as-deposited films are in amorphous state,and the Fe x C 1 x films are diamond-like carbon(DLC) films.After doping iron into the DLC films,a smooth surface morphology of the Fe x C 1 x films has been obtained with the surface roughness Ra of about 0.231 nm for x=18at%.The Fe x C 1 x films have good soft magnetic properties with the coercivity of approximately 20 Oe.A high positive magnetoresistance(MR) up to 93% with x=1at% was observed in a Fe x C 1 x granular film at 300 K.The resistance characteristic of Fe-C films is changed at about 230 K and the positive MR effect can be understood by the p-n heterojunction theory. | MA Lei LIU ZhongWu ZENG DeChang YU HongYa ZHONG XiaPing ZHANG XiaoZhong | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，9： | 3 |
| 2 | Magnetic properties and magnetoresistance of Co_xC_(1-x) granular films prepared by magnetron sputtering显示文摘Amorphous CoxC1-x granular films were prepared on n-Si(100) substrate by dc magnetron sputtering.The effects of Co concentration,film thickness and annealing temperature on the magnetic properties and magnetoresistance(MR) were investigated.After annealing at 500°C for 0.5 hour,the Co(002) peak of the CoxC1-x(x>2.5 at.%) films was observed,but cracks appeared in the films.Saturation magnetization Ms increased steadily with the increase of Co concentration from 2.5 at.% to 50 at.% and also increased with annealing temperature from room temperature to 400°C.The coercivity of CoxC1-x films was less than 180 Oe.The as-deposited Co2.5C97.5 granular films with 80 nm thickness showed a highly positive MR,up to 15.5% at a magnetic field of 0.8 T,observed at T=300 K when the external magnetic field was perpendicular to the film surface.With increasing film thickness and annealing temperature,the value of MR was found to decrease gradually and changed from positive to negative.The MR effect of the CoxC1-x granular films can be explained by p-n heterojunction theory and interface scattering effect. | MA Lei LIU ZhongWu ZENG DeChang ZHONG XiaPing ZHANG XiaoZhong | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，7： | 1 |
| 3 | Impulsive state feedback control during the sulphitation reaction in process of manufacture of sugar显示文摘In this paper,the system with impulsive state feedback control corresponding to the sulphitation reaction in process of manufacturo of sugar is considered.By means of square approximation and a series of switched systems,the periodic solution is approximated by a series of continuous hybrid limit cycles.Similar to the analysis of limit cycles of continuous systems,the existence and stability criteria of the order-1 periodic solution are obtained.Further,numerical analysis and discussion are given. | Guoping Pang Xianbo Sun Zhiqing Liang Silian He Xiaping Zeng | 2020 | International Journal of Biomathematics2020，13，8： | 0 |
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