Bulk amorphous FeCrMoGaPCB: Preparation and magnetic properties

The Fe 65.5Cr 4Mo 4Ga 4P 12C 5B 5.5 bulk amorphous alloy exhibits good soft magnetic properties. Amorphous rods with diameters of 1.5–3 mm and discs with 10 mm diameter and 1 mm thickness were prepared by copper mold casting. The coercivity of as-cast rods and discs is around 5 A/m, decreasing up to less than 1 A/m upon annealing. Bulk amorphous samples with larger sizes or various shapes can be prepared by ball milling combined with subsequent consolidation of the resulting powders. Using this route, we prepared amorphous discs with 10 mm diameter and 3 mm thickness. The coercivity of as-milled powder decreases after hot compaction and subsequent annealing, reaching 25 A/m.