Title :
Permanent magnet variable flux sources
Author :
Cugat, O. ; Hansson, P. ; Coey, J.M.D.
Author_Institution :
Dept. of Phys., Trinity Coll., Dublin, Ireland
fDate :
11/1/1994 12:00:00 AM
Abstract :
Rotatable transversely-magnetized permanent magnet rods can be used to generate variable, uniform magnetic fields or field gradients. A four-rod device for use at the specimen stage of an optical microscope is described where the field can be in-plane or perpendicular to the stage. The maximum flux density ranges from 36 mT (360 G) for isotropic ferrite to 210 mT (2.1 kG) For sintered Nd-Fe-B. Calculated and measured field profiles are in good agreement. Homogeneity is better than 1% of maximum in a region of diameter 7 mm or 3.5 mm at maximum and zero field, respectively
Keywords :
boron alloys; ferrites; iron alloys; magnetic fields; magnetisation; neodymium alloys; permanent magnets; 36 to 210 mT; Nd-Fe-B; ferrite; four-rod device; optical microscope; transversely-magnetized permanent magnet rods; variable flux sources; Coils; Magnetic domains; Magnetic field measurement; Magnetic fields; Magnetic flux; Magnetic materials; Magnetic moments; Magnetic separation; Optical microscopy; Permanent magnets;
Journal_Title :
Magnetics, IEEE Transactions on
