Study of Magnetic Stray Field Measurement on Surface Using New Force Microscope

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Abstract
Surface magnetic stray fields are studied using a new force microscope with an optical beam deflection force detector. The measurements are made possible by using both a constant repulsive force control and a magnetic force gradient measurement. The microscope can simultaneously provide a magnetic force gradient image and a surface structure image. Initial results demonstrate that the surface magnetic stray field and the surface structure image of a magneto-optical disk can be obtained. The new method provides feasibility of measuring the surface magnetic stray field.