Formation of MnBi ferromagnetic phases through crystallization of the amorphous phase

摘要

We have succeeded in forming singlehyphen;phase MnBi in its two ferromagnetic phases, the lowhyphen;temperature phase (LTP) and the quenched highhyphen;temperature phase (QHTP). The formation process involves rapid solidification into the amorphous state followed by thermal annealing. The crystallization of the amorphous material involves a series of transformations before singlehyphen;phase LTP (gsim;95 wt.thinsp;percnt;) is finally achieved at a temperature of 543 K. Further heating transforms LTP into its highhyphen;temperature structure at 635 K, which upon quenching to room temperature gives the QHTP. Some magnetic properties of LTP and QHTP are presented.