Magnetic Field-Induced Llo-Ferromagnetic MnA1

L1₀-MnA1 (τ-phase) is one of the Mn-based ferromagnetic alloys with high uniaxial magnetic anisotropy. As τ-phase is not equilibrium state, synthesis of τ-phase is accompanied by the appearance of non-ferromagnetic equilibrium phases. On the other hand, ferromagnetic phase is stabilized under the magnetic fields by the gain of Zeeman energy. The enhancement of ferromagnetic property was realized by in-field annealing for MnA1 film [1]. However, there is no report that synthesis of bulk τ-phase MnA1 succeeds by using high magnetic fields. In this study, for obtaining the high fraction of τ-phase, in-field synthesis for MnA1 alloys were performed under high magnetic fields up to 15 T.