![Sample our Engineering & Technology journals, sign in here to start your access, latest two full volumes FREE to you for 14 days]({"type":"image" , "src" : "/sda/5933/TOC-Subject-Sample-2021-Engineering-Tech.jpg"})
Abstract
Abstract
A sample of lithium chromium ferrite which exhibits self-reversal has been used to test the hypothesis that some magnetic remanences are produced by gyromagnetic effects caused by the irreversible switching of the moments of single-domain particles when subjected to magnetic fields comparable with their anisotropy fields. This has been done by measuring rotational remanent magnetization (RRM) at various temperatures over the range 10-90°C. In accordance with the gyromagnetic hypothesis, which predicts that RRM should be of anomalous sign when the magnetic moment and angular momentum vectors of each particle are parallel instead of the usual antiparallel, the RRM is of opposite sign between 30 and 46°C. From isothermal remanence and anhysteretic remanence measurements the lower temperature corresponds to the magnetic moment compensation temperature and, from previous ferrimagnetic resonance experiments carried out in 1953 by Van Wieringen on lithium chromium ferrite, the higher temperature may be identified as the temperature at which the spin angular momenta of the two sublattices are of equal magnitude. The results thus support the hypothesis and demonstrate that gyroremanences, unlike any other type of remanence, are capable of detecting an angular momentum compensation temperature.