Abstract
This paper presents a study of the thermal changes in the domain structure of a Co 90Hf 10 amorphous alloy. Melt-spun specimens were isothermally annealed under high vacuum at 700 K for 2 and 4 h and confirmed to have remained amorphous. A Phillips EM 301 transmission electron microscope working in the Lorentz mode (LTEM) and Fresnel contrast was used to study the domain structures. In the as-quenched alloy ripple structures observed, the alloy annealed for 2 h and the ripple structure gradually disappeared, with a tendency to form a stripe pattern originating from the main domain walls. Finally, in the alloy annealed for 4 h, stripe structures were formed, consisting mostly of Bloch walls. The observed changes in the domain patterns are discussed in terms of the domain energy.
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