MAGNETIC IMAGING REFERENCE SAMPLE

We propose a reference sample for magnetic imaging. We have chosen a t hin-film magnetic hard disk as a representative sample because the dom ains are very stable magnetically and thermally. This type of sample i s also of fundamental interest to the disk drive industry, currently t he largest user of magnetic force microscopy. Disk samples are prepare d by writing a special magnetic pattern consisting of various transiti on spacings designed to explore certain aspects of magnetic imaging. D isks are then cut into coupons, cleaned and patterned with a reference grid of numbered 20 mu m x 20 mu m Au frames. These frames allow easy navigation around the sample. We believe a sample of this type can he lp define limits, expectations and claims of resolution, as well as in strument sensitivity and ease of operation.