The interaction between domain walls and structural defects in equiatomic L1(0) FePt, antiphase boundaries and microtwins, was investigated by numerical simulations at atomic scale based on a Heisenberg model. It was shown that domain walls are strongly pinned, with depinning fields reaching a few teslas for the thickest microtwins. The potential well of the domain wall pinned in the microtwin is found to be asymmetric as a result of the pinning process. This results in depinning fields depending on the direction of propagation of the wall.
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