ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
A metallic glass, Fe43Cr25Ni20B12, which is paramagnetic at room temperature, becomes ferromagnetic under annealing near the crystallization temperature, then loses its magnetization with further annealing. This unique behavior is closely related to the precipitation of a very fine metastable body-centered-cubic phase in a nonmagnetic matrix. Since the magnetism of the annealed samples arises from very small magnetic particles, superparamagnetic behavior is observed. From the characteristic magnetization curves of superparamagnetism, the average moment and the density of the magnetic particles were estimated and found to be in good agreement with observations made by transmission electron microscopy. The tentative analyses for the sample annealed at 666 K indicate that both nucleation and growth take place in the early stage (3.5–20 h) and that nucleation ceases in the later stage (20–145 h) of the crystallization process.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.339532
