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DesignGuide 2

Effects of Stripe Width & 
Optimum Magnetic Head Performance
By Larry W. Ditty, Executive V. P. Technology, brush Industries, Inc.

New soft core head profile Condition of a new ceramic coated traditional material magnetic head. The magnetic head contour is shaped in a manner to insure good head gap to media contact. The traditional core material containing the head gap is in a plane slightly elevated above the ceramic. Magnetic heads in this condition will generally perform flawlessly.

Process of wear on soft heads Condition of a ceramic coated traditional material magnetic head. The softer traditional material magnetic core, sandwiched between the two adjacent areas of ceramic, had worn down flush with the ceramic. As abrasive magnetic media continued to pass over the head it wore in a concave manner (scalloping). This condition is caused by a low pressure area created at the top of the head and roller pressure on tickets. At this point the low pressure area is still able to maintain magnetic head gap to media contact. The magnetic head continues to function.

Spacing loss due to scalloping and dirt accumulation Condition of a ceramic coated traditional material magnetic head showing effects of scalloping to a point that low pressure (Bernoulli principle) can no longer maintain magnetic head gap to media contact. The magnetic head fails dramatically, no longer capable of reading or writing. In this case the head fails and is worn out. (see Spacing Loss figure below).

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Links for Magnetic Recording Heads, Magnetic Stripe and
Smartcard Testing and Equipment and Magnetic Stripe and Smartcard Readers

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