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| 两表面层铁电薄膜体介质层效应理论研究 | |
| 引用本文： | 王春栋,滕保华,程登木,周飞.两表面层铁电薄膜体介质层效应理论研究[J].四川师范大学学报(自然科学版),2011,34(5):684-689. |
| 作者姓名： | 王春栋 滕保华 程登木 周飞 |
| 作者单位： | 1. 电子科技大学物理电子学院,四川成都,610054 2. 电子科技大学微电子与固体电子学院,四川成都,610054 3. 南京航空航天大学高新技术研究院,江苏南京,210016 |
| 基金项目： | 国家自然科学基金(50975137);教育部留学回国人员科研启动基金(20071108)资助项目 |
| 摘 要： | 基于横场伊辛模型的平均场近似理论,研究了具有两个表面层铁电薄膜的体介质层对整个铁电薄膜相变性质的影响.给出了一个适合于研究任意层数具有两个表面层及体介质层铁电薄膜相变性质的递归公式.研究了体介质层的交换相互作用参量和横场参量对整个铁电薄膜相图的影响,以及交换相互作用参量对横场参量过渡值的影响和横场参量对交换相互作用参量的影响.结果表明,相图中铁电区、薄膜的居里温度、体介质层的横场参量过渡值均随体介质层的交换相互作用参量的增大而增大;体介质层的交换相互作用参量随体介质层的横场参量的增大而增大;而相图中铁电区、薄膜的居里温度却随体介质层的横场参量的增大而减小,并且发现体介质层的交换相互作用参量对薄膜的影响比其横场参量稍大些.最后也给出了两个表面层的交换相互作用对相图的影响. |
| 关 键 词： | 铁电薄膜 相图 体介质层 两表面层 |
On the Theory of the Effect of the Thick Dielectric Film Layers to Ferroelectric Thin Films with Two Surface Layers |
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| WANG Chun-dong,TENG Bao-hua,CHENG Deng-mu,ZHOU Fei.On the Theory of the Effect of the Thick Dielectric Film Layers to Ferroelectric Thin Films with Two Surface Layers[J].Journal of Sichuan Normal University(Natural Science),2011,34(5):684-689. | |
| Authors: | WANG Chun-dong TENG Bao-hua CHENG Deng-mu ZHOU Fei |
| Institution: | 1.School of Physical Electronics,University of Electronic Science and Technology of China,Chengdu 610054,Sichuan; 2.School of Microelectronics and Solid-State Electronics,University of Electronic Science and Technology of China,Chengdu 610054,Sichuan; 3.Academy of Frontier Science,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,Jiangsu) |
| Abstract: | With the help of the mean-field approximation under the transverse Ising model,the influence of the thick dielectric film layers on the phase transition properties of the ferroelectric thin films with two surface layers was studied.By treating with the model,a recursive equation for the phase transition properties of the ferroelectric thin film with two surface layers and thick dielectric film layers was obtained.The effects of the exchange interaction and the transverse field of the thick dielectric film layer to the phase diagrams were studied as well.Additionally,the influence of the exchange interaction to the crossover value of the transverse field,and the influence of the transverse field on the crossover value of the exchange interaction were also investigated.The results show that the ferroelectric range,the Curie temperature,and the transverse field of the thick dielectric layers all become large,with the exchange interaction of the thick dielectric layers increase.And the exchange interaction of the thick dielectric layers also become large when its transverse field increases,while the ferroelectric range,the Curie temperature become small with the increasing of the transverse field of the thick dielectric layers.Meanwhile,it is also found that the influence of the exchange interaction of the thick dielectric layers on the whole film is larger than its transverse field.At last,the effect of the exchange interaction of the two surface layers on the phase diagram is also shown.The numerical results will be helpful to the fabrication of the thick dielectric ferroelectric film. |
| Keywords: | ferroelectric thin films phase diagram thick dielectric films two surface layers |
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