Origin of inverted-in-sense and constricted near-surface hysteresis loops of magnetic plates

New types of magnetic hysteresis loops, inverted-in-sense and crossed, have been observed in some directions of the surface of METGLAS 2605SC circular plates (Allied Chemical Corp.) The origin of these kinds of loops and other constricted ones observed in the surface of magnetic plates is explained. They appear because the internal field that acts on surface and inside the sample is mainly determined by the bulk properties of the sample. The validity of this interpretation is tested with additional measurements in METGLAS 2605SC.