Total Core Losses of Fe70Y5NbxMo5-xB20 Bulk Amorphous Fe-Based Alloys

Remagnetisation losses are one of the most important performance parameters of materials designed for the production of low-loss transformer cores. Classical Fe–Si alloys are characterised by losses of a few W/kg. However, the crystal structure makes these materials unsuitable for use at high frequencies.
The ferromagnetic Fe-based alloys constitute an interesting group of alloys with magnetic soft properties. This group includes alloys from the Fe–Me–B system (where Me is one of the range of transition metals). This study investigates the structure, and losses due to remagnetisation, of bulk amorphous FeYMoNbB-based alloys. It was found that the addition of a small quantity of Nb changes the structure, and the magnitude of the losses. The addition of Nb significantly reduces additional losses; this effect is associated with the changing melt viscosity.