ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The samples are prepared by the coprecipitation method.1 The average particle size is 0.07 μm, which is less than critical single-domain size. Thermomagnetic curves (TMC) of thermally demagnetized samples are studied between 300 and 800 K in external fields up to 8 kOe by VSM. An experimental curve with a well-expressed maximum closely below the Curie temperature (so-called Hopkinson effect) is shown on Fig. 1 (curve 1). Curve 2 on the figure shows a TMC calculated on the basis of the Stoner–Wohlfarth model, following the method described in Ref. 2. There is a good agreement between the experimental and calculated curves. This agreement becomes better when the thermal activation processes are taken into account.3 These results can be considered as an experimental confirmation of the existence of the Hopkinson effect in systems of single-domain particles.〈ks〉
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.348106
