Scanning Hall probe microscopy of ferromagnetic structures

A state-of-the-art scanning Hall probe microscope (magnetic field sensitivi ty:spatial resolution: 30 nT/root Hz: 0.8 mu m-300 nT/root Hz : 0.25 mu m) has been used to image a range of ferromagnetic media. The technique is non -invasive and yields quantitative profiles of the stray fields near the sam ple surface as illustrated by images of a standard magnetic reference sampl e, permalloy nanostructures and colossal magnetoresistive perovskites. Rapi d scanning (similar to 1 frame/12 sec) has also been used to study the doma in reversal in a thin Ni him. (C) 1999 Published by Elsevier Science B.V. A ll rights reserved.