Title :
Magnetic properties of a sintered Sm(Co0.75Fe0.20 Mn0.04Cr0.02)8.2
Author :
McCurrie, R.A. ; Jackson, S.
Author_Institution :
Dept. of Electr. Eng., Bradford Univ., UK
fDate :
3/1/1990 12:00:00 AM
Abstract :
Measurements have been made of the hysteresis in the permanent-magnet alloy Sm(Co0.75Fe0.20Mn0.04 Cr0.02)8.2, which has a room-temperature energy product of 200 kJ m-3. From observations of the domain structure using the Kerr polar magnetooptic effect, the hysteresis loops, and the dependence of the coercivity on the maximum applied field, it has been concluded that the coercivity is determined principally by the difficulty in nucleating reverse domains within the grains. Measurements of the temperature dependence of the magnetic properties have been made in the range 77-1073 K. The coercivity decreased very rapidly as the temperature increased
Keywords :
Kerr magneto-optical effect; chromium alloys; cobalt alloys; coercive force; ferromagnetic properties of substances; iron alloys; magnetic domains; magnetic hysteresis; manganese alloys; permanent magnets; samarium alloys; 77 to 1073 K; Kerr polar magnetooptic effect; Sm(Co0.75Fe0.2Mn0.04Cr0.02 )8.2; coercivity; domain structure; hysteresis loops; magnetic properties; permanent-magnet alloy; reverse grain nucleation; room-temperature energy product; sintered magnet; temperature dependence; Chromium alloys; Coercive force; Energy measurement; Iron alloys; Magnetic field measurement; Magnetic hysteresis; Magnetic properties; Magnetooptic effects; Manganese alloys; Temperature dependence;
Journal_Title :
Magnetics, IEEE Transactions on
