J. Castro et Hj. Blythe, AN ANALYSIS OF THE HIGH-TEMPERATURE INITIAL SUSCEPTIBILITY OF SINGLE-CRYSTAL COBALT, Journal of physics. Condensed matter, 8(7), 1996, pp. 851-863
The ac initial susceptibility of a cobalt single crystal with [0001] o
rientation has been measured in the temperature range 300 to 820 K. A
theoretical treatment of the susceptibility in the range 300 to 700 K
has been given in terms of the contributions of domain wall displaceme
nts and magnetization vector rotations in the appropriate temperature
intervals; this theoretical treatment is found to be in good agreement
with the experimentally observed variation. Measurements in the range
700 to 820 K include the martensitic phase transformation at 710 K, w
hich has a pronounced influence on the susceptibility. Magnetic relaxa
tion measurements have also been made over the whole temperature range
(300 to 820 K) and are found to be fully consistent with the interpre
tation of the susceptibility data. An important feature of the relaxat
ion spectrum is a null region (584 to 710 K) which corresponds to that
temperature range where contributions to the susceptibility occur due
solely to magnetization rotations.