Ferromagnetism of Mn-Al system alloys is determined by a metastable τ-phase, which is usually stabilized by small amount of C. This phase formed under specific thermal treatment, it has an ordered L1₀ type face centered tetragonal structure and exhibits rather high value of magnetic anisotropy constant. For a given chemical composition the as-cast state the coercivity value is usually low. The improvement of magnetic properties may be attained by plastic deformation. For studying domain structure and magnetic hysteretic hysteretic properties the samples with different structural states of τ- phase were processed by means of deformation and thermal treatment. After annealing at 900°C the cast samples were cooled in the oil. During this processing the coarse grained nonmagnetic ε-phase transformed into a needle type τ-phase. Subsequent extrusion under different temperature - strain rate conditions and additional annealing enables formation of τ-phase with submicron mean grain size (0.5-0.7 μm) and different dislocation density(10⁹-10¹¹сm^-2). It is shown that coercivity increases from 303 to 368 kA/m as the grain size decreases in submicron grained samples, and does not depend on the dislocation density. In these samples most of the grains in the initial nonmagnetized state have multidomain structure and contain several domains with alternating antiparallel directions of magnetization divided by straight parallel Bloch type domain walls. The estimation of the criterion of single domain state suggests that magnetization occurs by means of nucleation of the reverse domains in submicron structural state and by means of domain walls displacement in nanocrystalline state. That means that in spite of significant refinement of τ-phase a single domain state has not been achieved in either of the structural states under study.

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