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A particle rotation technique for producing very high coercivity magnetic stripes

Naylor, R.B.

This paper describes a current research program at Sandia National Laboratories whereby magnetic stripes made from very high coercivity magnetic materials are produced through the use of a new particle rotation technology. This new process allows the stripes to be produced in bulk and then held in a latent state so that they may be encoded at a later date. Since particle rotation is less dependent on the type of magnetic particle used, very high coercivity particles could provide a way to increase both magnetic tamper-resistance and accidental erasure protection of the magnetic stripes.