| 摘要 |
PURPOSE:To obtain a laminated material for a magnetic head preventing a loss due to an eddy current by heating a laminated material of an Ni-Fe alloy having an Al layer between layers to a specified temp. to form an insulating layer of Al2O3 between the layers. CONSTITUTION:The surface of a thin Ni-Fe alloy plate is coated with an Al layer by vapor deposition or other method, and laminating and rolling are carried out to obtain a laminated material having an Al layer between layers. The laminated material is heated to 750-1,300 deg.C, preferably 1,000-1,300 deg.C to form an insulating layer of Al2O3 between the layers. The thickness of the Al layer is regulated to <=1/10 times the thickness of the Ni-Fe alloy plate, and it is preferable to heat the laminated material in an atmosphere of wet gaseous hydrogen with <=0 deg.C, preferably <=-40 deg.C dew point. The core of a magnetic head can be formed accurately by using the resulting laminated material. |
