Magneto-electro-optic Effect Of GaN-based Semiconductor / Terfenol-D Composite Structure

The study of multiphysics coupling behavior of new materials and structures is a frontier topic in the field of electromagnetic solid mechanics research.The research on magnetoelectric effect and Ga N semiconductor are hot research fields worthy of attention in the international and domestic future.At present,the research on magnetoelectronic composites and structures is mainly focused on the composite structure using traditional ceramic materials as piezoelectric layers,while there are few studies on the use of semiconductor piezoelectric layers,and the research on the coupling behavior of magneto-mechanical-electro-optical multi-physical fields is relatively scarce.Existing studies mainly focus on capturing experimental phenomena and lack of relevant theoretical research.However,there are many factors affecting the experimental process,and it is impossible to accurately evaluate the effects of various factors on the coupling behavior of multi-physical fields of composite structures.Based on piezoelectric effect and magnetostrictive effect of materials,the multi-physical field coupling behavior of Ga N-based semiconductor/Terfenol-D multilayer composite structures is studied theoretically in this paper.The magnetoelectronic model and magnetoelectronic model of the composite structure are proposed.The effects of magnetic field and prestressing on the energy band,wave function overlap rate,spatial distribution of electrons and holes and optical properties in quantum wells are analyzed.The main contents and conclusions are as follows:1.The piezoelectric model of Ga N-based semiconductor and magnetostrictive model of Terfenol-D film are established.Based on the piezoelectric model and magnetostrictive model,the magnetoelectric model of composite structure is established.The model can quantitatively analyze the changes of polarization charge and strain in the piezoelectric layer of composite structure under different magnetic fields and prestressing.The research results have important guiding significance for improving the magnetoelectric properties of composite structures.2.The self-consistent theoretical model and the magneto-electro-optic model of the composite structure of quantum wells are established.For the quantum well structure,the self-consistent theoretical model can well describe the influence of piezoelectric polarization on the spatial distribution of energy bands,electrons and holes in quantum wells.For the magneto-electro-optic model of composite structure,the effects of magnetic field and prestressing force on energy band,overlap rate of wave function,spatial distribution of electrons and holes and optical properties are analyzed and discussed.The results show that the piezoelectric and photoelectric properties of quantum well structures can be improved by adding magnetostrictive layer.The magneto-mechanical-electro-optical coupling model established in this paper can be extended to the heterostructures of other nitrides.The idea of modeling and the method of dealing with the problem of multi-physical field coupling can provide effective research ideas for solving the problem of multi-field coupling of other intelligent materials.The research results provide theoretical basis for the design and development of magnetic-electro-optical interconnection and control intelligent devices.