ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The complex ac magnetic initial susceptibility (χ=χ'−jχ‘) has been measured along the [100], [110], and [001] directions from 4.2 to 300 K. Along the two basal directions the spin-reorientation phase transition (SRT) is detected at TS =57.8 K as an abrupt steplike anomalous decrease in χ' for increasing temperature. The value of the experimental ratio χ'[110]/ χ[100] (approximately-equal-to)2 holds for T≥TS. The reversible magnetic moment rotation set on by the exciting ac magnetic field explains these results, allowing a fit from which the stress constant σ=42±1 kg/mm2 is derived. Along the [001] direction no anomaly in χ'(T) is detected at TS while a strong continuous increase is manifest above 150 K. It is explained by the onset of narrow wall motions between 180° domains induced by thermal excitations.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.342327
