Preparation And Structure, Properties Of Fe-Ni Film Under High Magnetic Fields

For enlarging the disk space, the recording density should firstly be increased. Unfortunately, the coercive force will be increased simultaneously, therefore there is a new challenge on the preparation of magnetic head. High density write-read magnetic head needs high saturation magnetization and lower coercive force, which works as the maintenances on the readable and writable under higher coercive force, and also reduces the thermal noise when the disk is writing. Now the Fe-Ni alloy firm magnetic head or multilayer alloy firm magnetic head, which is based on Fe-Ni membrane magnetic head, are widely used on the preparation of magnetic head. As a result, the improvements on the microstructure and property of Fe-Ni alloy firm magnetic head are the researching direction to break the bottleneck of the increase on intensity of disk surface.Among the preparing techniques of alloy firm, molecular beam vapor deposition, with the advantages of accuracy control of growth rate and lower impurity concentration, has been researched widely at mechanism of growth, surface microstructure, impurity mix of alloy firm in some research areas and verified to be stable for preparing high density Fe-Ni alloy firm magnetic head. Although the researches of alloy firm under no magnetic field existed has been for a long time, most of them focused on the preparing techniques of alloy firm and the addition of different group component to improve the performance, which resulted the higher cost and more complexities in the process of preparing. Therefore, the research of importing outer conditions in the process of preparing emerges during recent time. Some researches demonstrated that the intense magnetic field can effectively refine the crystal grain, enhance the planeness of the surface and improve magnetic property of alloy firm, as a result, the preparation of Fe-Ni alloy firm under the condition of intense magnetic field has been the new way to increase the storage density.In this paper, the combination of both the intense magnetic field and the molecular beam vapor deposition together worked as the main way to be preparation the materials of Fe-Ni alloy firm, which applied to the read-write magnetic head with high density. By means of scanning electron microscopy (SEM), X-ray diffraction (XRD), vibrating sample magnetometer (VSM) etc, we studied the uropatagia temperature, the thickness, alternation of the microstructure and the property of alloy firm under the different magnetic fields and analyzed the correlative factor that could exert the influence on the microstructure and magnetic property in the process of the growth of Fe-Ni alloy firm. What we concluded as below:1. The uropatagia temperature could exert the influence over the surface pattern of Fe-Ni alloy firm. When the temperature raised from180℃to300℃, the size of crystal grain could be enlarged since the particle obtained more and higher energy. It resulted that the coercive force decreased and saturation intensity increased.2. The magnetic density could exert the influence over the surface pattern, microstructure, and magnetic property of Fe-Ni alloy firm. With6T magnetic field, the surface planeness increased, the crystal grain refined and the distribution more uniformed of the alloy firm. In addition, the magnetic density could redirect the orientation of preferential growth of alloy firm (from200to111). At time the temperature up to180℃, magnetic field with6T could decrease the coercive force and increase the saturation intensity.3. Based on magnetic field with6T, the coercive force could be decreased and the saturation intensity could be increased along with the increase of the thickness of Fe-Ni alloy firm, which caused the sediment when the temperature of quartz uropatagia was up to180℃In addition, in the process of the alternation of magnetic density at2T,4T and6T, the coercive force could be increased and the saturation intensity decreased along with the increase of magnetic density.4. With6T magnetic field, the microstructure and property of the pure Fe alloy firm improved distinctly. Further, we concluded that the performance price ratio of the low-cost Fe-Ni alloy firm with low-Ni could be increased significantly under the condition of with6T intense magnetic field on it.