Synthesis, structural, and magnetic properties of Heusler-type Mn2-xFe1+xGe (0.0 ≤ x ≤ 1.0) alloys

[摘要] Bulk Mn2-xFe1+xGe (0.0 <= x <= 1.0) alloys have been synthesized by arc-melting followed by a low temperature homogenization thermal annealing, whereas for comparison purposes the Mn2FeGe alloy was also produced in ribbon form by rapid solidification. A study of the structural and magnetic properties is presented. Contrary to theoretical predictions, Mn2FeGe crystallizes in a hexagonal DO19 crystal structure (space group P63/mmc) and orders ferromagnetically with a saturation magnetization (M-S) value of similar to 1.7 mu(B)/f.u. in the ground state. With the substitution of Fe for Mn in bulk Mn2-xFe1+xGe, we observed an increase in the FM interactions with a maximum M-S value of 5.1 mu(B)/f.u. for x = 1.0, and a significant progressive increase in the Curie temperature (T-C) in a wide range spanning similar to 200 K to over 400 K.

[发布日期] 2021-11-15

[关键词] Heusler-type Mn2-xFe1+xGe alloys;Crystal structure;Magnetization;Curie temperature