Process for modifying the properties of a thin film of a magneticas magnetically active material and marker for anti-theft systems or localization)

摘要

PCT No. PCT/GB91/01783 Sec. 371 Date Jun. 5, 1992 Sec. 102(e) Date Jun. 5, 1992 PCT Filed Oct. 14, 1991 PCT Pub. No. WO92/07343 PCT Pub. Date Apr. 30, 1992.A method of modifying the magnetic properties of a thin film of a magnetically active material is provided which comprises forming surface modulations on the material in order to partition it into regions which display at least some degree of mutual magnetic independence. The resulting modified thin film may be used as a marker or tag in an anti-pilferage or article location system. The surface modulations formed on the material in the anti-pilferage or article location marker serve to enhance the response of the marker when used in an anti-pilferage or article location system.