Simulation of magnetization process and Faraday effect of magnetic bilayer films

We described ferromagnetic film and bilayer films composed of two ferromagnetic layers coupled through antiferromagnetic interfacial interaction by classical Heisenberg model and simulated their magnetization state,magnetic permeability,and Faraday effect at zero and finite temperature by using the Landau–Lifshitz–Gilbert(LLG)equation.The results indicate that in a microwave field with positive circular polarization,the ferromagnetic film has one resonance peak while the bilayer film has two resonance peaks.However,the resonance peak disappears in ferromagnetic film,and only one resonance peak emerges in bilayer film in the negative circularly polarized microwave field.When the microwave field’s frequency exceeds the film’s resonance frequency,the Faraday rotation angle of the ferromagnetic film is the greatest,and it decreases when the thickness of the two halves of the bilayer is reduced.When the microwave field’s frequency remains constant,the Faraday rotation angle fluctuates with temperature in the same manner as spontaneous magnetization does.When a DC magnetic field is applied in the direction of the anisotropic axis of the film,the Faraday rotation angle varies with the DC magnetic field and shows a similar shape of the hysteresis loop.

On the Effective Ways of Constructing the Discourse System of Higher Education with Chinese Characteristics

Higher education is an important symbol of state soft power.Constructing the discourse system of higher education with Chinese characteristics is of great significance to build a powerful country in higher education and enhance the international influence of higher education.The main ways to construct the discourse system of higher education with Chinese characteristics are as follows:first,we should take root in China,devote ourselves to the study of the realistic logic and Chinese problems during the development process of higher education in contemporary China and focus on creating new concepts,new categories and new expressions of higher education with originality and identity;the second is to integrate Chinese and Western cultures,realize the transformation of discourse logic of higher education,and demonstrate high-quality concepts of higher education and development models to other countries in the world;the third is to promote the modernization of higher education in an all-around ways with the support of constructing world-class universities and first-class disciplines,obtain discourse power in the academic and policy fields of international higher education,and show the world the Chinese road,Chinese model and Chinese experience during the development of higher education.