Williams has found that when Mn and Bi are successively evaporated on a glass substrate, followed by prolonged annealing around 300 °C, a ferromagnetic MnBi thin film can be obtained with its c‐axis perpendicular to the film plane. In order to elucidate the formation process of the film, Rutherford backscattering (RBS) experiment, X‐ray diffractometry, electron microscope study, and magnetic measurement are carried out. It is found that at the first stage of annealing up to 250 °C a non‐magnetic transitional compound Mn1.2Bi is formed, and during the subsequent annealing at 250 °C, the final MnBi crystals with the aligned c‐axes nucleate, and grow at the expense of the transitional phase. It seems likely that at the last stage of reaction, a few Bi crystals remaining in the transitional phase may serve as the nuclei.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics