Study of domain structure and magnetization reversal after thermal treatments in Fe40Co38Mo4B18 microwires

We have studied the effect of thermal treatment on the magnetic domain structure and magnetic reversal process of amorphous and nanocrystalline Fe40Co38Mo4B18 microwires. The domain structure and the magnetization reversal of amorphous FeCoMoB microwires reflect the complex stress distribution introduced by the glass coating. Hence, the thickness of radial domain structure decreases with temperature and the temperature dependence of the switching field presents a discontinuous behavior. After nanocrystallization, the domain structure of FeCoMoB microwire is almost constant within the temperature range 10–400 K and the switching field decreases almost linearly with temperature mostly because of the decrease of saturation magnetization.

► Nanocrystalline FeCoMoB microwires are characterized by the high Curie temperature.
► Nanocrystalline FeCoMoB microwires remains bistable even in nanocrystalline state.
► Nanocrystalline FeCoMoB microwires are characterized by high magnetic stability in a wide temperature range.