Abstract
In this paper we describe a novel method for observing the domain structure of a magnetic material by strain imaging. When a magnetic field is applied to a magnetic material, strain is generated by magnetic forces, electromagnetic interactions, and magnetostriction. Because the strain has the factors that depend on the magnetization of each of the domains, we can observe the domain structure by detecting and imaging the strains using a scanning probe microscope. We have been successful in imaging the magnetic domains of a hard disk by lock-in detecting strains induced by an alternating magnetic field, using an atomic force microscope.
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