講演情報
[10p-PA2-10]Controlled Growth of Chemically Synthesized Magnetic Ni-Mn-Ga Alloy Films
〇(D)Fadhilatu Zikra1, Mutsuhiro Shima1, Koki Sasaki1, Hibiki Kuroda1, Keisuke Yamada1 (1.Gifu Univ)
キーワード：
Alloy Thin Film
Heusler alloys are intermetallic compounds with a general composition of X2YZ. Among them, Ni2MnGa has attracted considerable attention owing to its ferromagnetic shape memory effect, which strongly depends on composition and crystal structure. While vapor-deposited Ni2MnGa films have been extensively studied, chemically synthesized films remain less explored despite their cost effectiveness and ease of composition control. In this work, NixMnyGa100-x-y alloy films were synthesized by a co-precipitation method followed by annealing and reduction treatments. Structural, compositional, and magnetic properties were characterized by XRD, SEM, TEM, EDX, and VSM. XRD analysis of Ni39Mn60Ga1 films revealed an FCC structure with pronounced (111) and (200) reflections. The (111) texture developed with increasing annealing temperature, as indicated by the Lotgering factor increasing from 0.30 to 0.80. Saturation magnetization increased from 60 to 94 emu/cm3 up to 973 K, then decreased to 23 emu/cm3 at 1173 K, possibly due to the formation of antiferromagnetic Ni-Mn phases. The correlation between texture evolution and magnetic properties will be discussed.