High-Field Magnetization of Some Mn Alloys(Magnetism)

概要

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We have made high-field magnetization measurements for some Mn alloys : ε-Mn_<3+δ>Ga with δ= -0.30, ε-(Mn_<1-x>Fe_x)_3Sn with x=0.1 and 0.3, Fe_3Mn_4Ge_<6.1> and γ-(Mn_<1-x>Fe_x)_<1-y>Ga_y with x=0.44 and y=0.27. The ε-Mn_<3+δ>Ga has the hexagonal D0_<19> type structure and a distorted triangular antiferromagnetic spin structure. The hexagonal lattice is slightly distorted to an orthorhombic lattice at T_d of about 290 K with large magnetization. Pseudo-binary ε-(Mn_<1-x>Fe_x)_3Sn has also the D0_<19> type structure, and the alloys with x<0.4 show coexistence of a triangular antiferromagnetic state and a ferromagnetic state. The triangular spin structure is preserved even in the high field of up to 150 kOe. Ternary alloy Fe_3Mn_4Ge_<6.1> has an hp13-type structure, and shows an antiferromagnetism below 470 K. The isothermal magnetization at 77 K shows a steep increase around 110 kOe, suggesting the metamagnetic transition. The γ-(Mn_<1-x>Fe_x)_<1-y>Ga_y is face centered cubic. The alloys with x=0.4〜0.5 and y=0.27 show coexistence of an antiferromagnetic state and a ferromagnetic state below Neel temperature (T_N〜300K), and a typical ferromagnetic behavior above T_N ( Curie temperature T_C>550 K). The magnetization of the coexisting state at 77 K in a field of 150 kOe was comparable to that of the ferromagnetic state at 300 K.
東北大学の論文
1993-06-30