Magnetostriction Measurement Technique and Associated Test Fixture for Disk Media Characterization
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
With the advent of continuous thin magnetic media disk technologies for disk and tape storage applications, the control of the magnetic properties of such uniaxial films is of prime importance to media performance. It is well known that common deposition processes, such as evaporation and sputtering, can introduce interfacial media stresses (either compressive or tensile) in the order of several thousand psi. Such stresses are usually undesirable and can introduce unpredictable changes in media hysteresis loop characteristics due to the phenomenon known as magnetostriction. Because many state-of-the-art magnetic media exhibit unknown magnetostriction behavior, an effective technique is needed to determine quickly and accurately the magnitude of this undesirable effect in a given disk media.