Fabrication, Structural and Magnetic Properties for Aligned MnBi

• Published in: Chinese physics letters Vol. 27; no. 9; pp. 199 - 202
• Main Author: 刘永生 张金仓 任忠鸣 谷民安 杨晶晶 曹世勋 杨正龙
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.09.2010
• Subjects: Alignment; Anisotropy; Coercive force; Crystals; Magnetic fields; Magnetic properties; Magnetization; MnBi; Saturation (magnetic); 各向异性常数; 温度升高; 磁场方向; 磁性能; 饱和磁化
• ISSN: 0256-307X; 1741-3540
• DOI: 10.1088/0256-307X/27/9/097502

MnBi compound is fabricated under a magnetic field of 1 T, and the c-axis of hexagonal MnBi crystal is aligned parallel to the magnetic field direction. The saturation magnetization Ms decreases with the increase of temperature. At temperatures below 20OK, the coercive field Hc is about 150Oe, while the coercive field Hc increases with temperature above 200K. From 200K to 300K, the remnant magnetization Mr and the Mr/Ms increase with the temperature. Below 200K, Mr and Mr/M8 reach roughly a constant value. However, there is an abnormal increase at 100 K in He, Mr and Mr/Ms, which comes from a spin-reorientation in MnBi. Magnetization results show the spin-reorientation for MnBi at about 91 K due to the variations of the anisotropy constants.