| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the alteration by cutting and sticking by constituting a magnetic recording medium laminated with a hard magnetic layer and a soft magnetic layer on a substrate, including magnetic track parts used for recording of reversible magnetic information and the remaining magnetic layer parts exclusive of thereof in the hard magnetic layer and providing the magnetic layer parts of the soft magnetic layer corresponding to the regions deviating from the remaining magnetic layer parts and/or magnetic track parts with the fixed magnetic information by physical working. SOLUTION: The hard magnetic layer 20 is formed on the substrate 10. The surface of the hard magnetic layer 20 is provided with the soft magnetic layer 30 and is further provided with a concealing layer 40. The soft magnetic layer 30 is provided with areas 31 for the magnetic track parts 21 of the hard magnetic layer 20 and the magnetic layer parts 35 of the remaining parts exclusive of these areas 31. Plural dots 33a of a recessed shape which are arrayed 2 in a direction approximately perpendicularly to the scanning direction of the magnetic head and are formed by the physical working are formed in the magnetic layer parts 35 of the remaining parts. The magnetic layer including the magnetic layer parts 35 of the remaining parts is partly so formed as to have the fixed magnetic information, by which the decision of the alteration by writing, cutting and sticking is made possible.</p> |
