| 摘要 |
PURPOSE:To improve the recording density by irradiating an energy beam to laminated films formed by laminating plural kinds of non-magnetic films which are raw materials for spinel ferrite on a substrate thereby forming a ferromagnetic ferrite pattern. CONSTITUTION:Many layers of thin films consisting of hematite 2 and one or plural materials among Ni oxide 3, copper oxide, Mn oxide, Zn oxide and Mg oxide which are raw materials for spinel type ferrite are laminated on the substrate 1 to form the laminated films thereon. When energy is then applied to the optional part of the laminated films by a light beam, ion beam, etc., the laminated films in the irradiated part are changed by a chemical reaction into the ferromagnetic spinel type ferrite. The recording of signals to the laminated films is made possible by such method. There is no need for writing the signals by a magnetic head if such recording method is used and therefore the material which exhibits large coercive force to overcome the diamagnetic field is usable as a magnetic material and the higher density recording is made possible.
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