Electron holography studies on narrow magnetic domain walls observed in a heusler alloy Ni ₅₀Mn ₂₅Al _12.5Ga _12.5

Peculiar magnetic domain walls produced in Heusler alloys, which have attracted renewed interest due to their potential application to actuators and spintronic devices, are studied here using electron holography. The observations reveal unexpectedly narrow magnetic domain walls, the width of which showed perfect agreement with that of the antiphase boundaries (APB, e.g., only 3 nm). While the results can be explained by the significant depression of ferromagnetism due to the local chemical disorder, the electron phase shift indicates that ferromagnetic correlation still remains in the APB region. Peculiar magnetic domain walls produced in a Heusler alloy are studied using electron holography. The observations reveal unexpectedly narrow magnetic domain walls, the width of which shows perfect agreement with that of the antiphase boundaries (e.g., only 3 nm). This method provides beneficial information for obtaining a deeper understanding of the magnetic order in the vicinity of an interface.