Effect of order-disorder transition on magnetic properties of rapidly soldified high silicon-iron ribbons
The effect of ordering on the soft magnetic properties of 6.5% silicon-iron ribbons obtained by rapid solidification is studied. The atomic order cannot be prevented by the fast cooling. It is shown that isothermal aging at 700 degrees C induces a small decrease in coercive force and hysteresis losses, while aging at 500 degrees C induces an increase in these parameters. The magnetic evolutions are corroborated by Lorentz microscopy observations. The values obtained and the observations suggest a weak individual interaction, which may be due to local variation of exchange and anisotropy energy. >
Effect of antiphase boundaries on the magnetic properties of Cu-Mn-Al Heusler alloys
Abstract The magnetic properties of Heusler alloys of approximate composition Cu2MnAl have been studied by Lorentz microscopy. as a function of composition, heat treatment and plastic deformation. Magnetic domain walls have been observed to be pinned at antiphase boundaries. The strength of pinning varies with composition and heat treatment, being strongest in alloys in which some of the aluminum has been replaced by copper, and in specimens which have been quenched from above the ordering temperature The pinning is thought to be due to antiferromagnetic coupling between the magnetic moments of manganese atoms on opposite sides of antiphase boundaries. Magnetic domain walls are also pinned at antiphase boundaries produced by the splitting of superlattice dislocations during plastic deformation. The results obtained by Lorentz microscopy provide an explanation for the variations of bulk magnetic properties with composition and heat treatment.
Magnetic properties of 6.5% silicon-iron ribbon produced by splat-cooling technique
Abstract It has been found that the silicon-iron ribbons containing up to 6.5% silicon can be prepared by the splat-cooling technique. The obtained ribbons are very pliable in spite of high-silicon—iron alloys. Magnetic properties of this ribbon are discussed.