Calder?n Technique Based Integral Equation Methods In Computational Electromagnetics

The miniaturization and intelligent of the system drew our attention,as the continuous development of IT technology. Larger ratio of system of the magnetic device, has become an important factor limiting miniaturization of electronic system, and gradually aroused people’s attention. The purpose of this paper is to study the characteristics of submillimeter magnetic thin film unit, through optimizating the structure of the unit to improve the high frequency characteristics.In this paper, both the experiment and the simulation on submillimeter and micron of magnetic thin film were studied. Experiments the submillimeter magnetic lattices were manufactured using micro machining and magnetron sputtering. Respectively we carried out the length change, thickness change and layered change experiment, at the same time improve the magnetic spectrum test method and test data to embedding method, through the hysteresis loop and magnetic spectrum test, get the submillimeter frequency characteristic of magnetic unit and material length, thickness, and hierarchical relationships. For ratio, respectively 1:1, 1:2 and 1:4 length change lattice hysteresis loop analysis found that width ratio of 1:4 under the condition of long, submillimeter magnetic coercive force is the smallest cell. Analysising the thickness of 50nm、100 nm and 200 nm of hysteresis loop of the cell respectively, while the thickness of 50 nm its coercive force is the lowest. And by adding 5 nm Cu to divide the 150 nm of NiFe we found, the coercive force is the lowest in the systemis when divided into two layers.Analog part mainly focused on 2*1 μm2 magnetic unit, OOMMF software is used to calculate the magnetic unit under different structure of magnetic spectrometer, calculated the magnetic conditions can be improved. For 2*1 μm2 changes in the structure of magnetic unit, mainly in its different position add rectangular slits and increase the number of slits, in the short axis with removal of part or add magnetic materials, etc., through the shape of the change of magnetic field to change the magnetic materials and anisotropic field, thus improve the high frequency magnetic micro magnetic unit. By adding the appropriate slits in place, we can get the structural unit magnetic permeability promoted 32.5% than the magnetic permeability of magnetic unit without slits, it also illustrates the slits in the proper place to add is improves the magnetic permeability of the cell. At the same time, in the case of observation of different slit magnetic spectrum curve, we found there will be multiple resonance peaks. Through simulation, we find the resonance of the position, and theirs briefly analyzed.