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A new versatile scanning hardware based on a Micromagnetics® STJ-020 MgO-based tunnelling magnetoresistance (TMR) sensor has been developed to volumetrically scan the thin boundary layer above a given sample. An (x, y) planar scan of the surface of a 7.5 mm × 7.5 mm sample of grain-oriented (3% Si) electrical steel is presented. Stray fields normal to the surface between −116 and 272 A/m are measured...
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