Projects and Thesis

It is expected that SmCo4B exhibits the highest anisotropy field (Ha) with an estimated value of 90 T [1] at 300 K among intermetallic compounds. In this work, (1) the first aim is to synthesize SmCo4B samples in ball-milled powder form and in single crystal form (for ARL) to measure first time their anisotropy field with vertical single coil turns up to 100 T (Tokyo) and with non-destructive pulse coil up to 60 T (Dresden), respectively. The initial results will be obtained up to 14 T in our lab. As depicted in Figure 1, the preliminary results of ball-milled SmCo4B have already highlighted the significant magnitude of Ha. In this study, we will reduce the particle size through a systematic ball-milling experiment aimed at enhancing the signal-to-noise ratio for measuring vertical single coil turns. On the other hand, for non-destructive pulse coil measurement, a large single crystal is necessary (for ARL).

Besides the extremely high anisotropy field, SmCo4B exhibits low saturation magnetization of 0.4 T. (2) The second aim is to tackle this problem by composition tunning. For this purpose, SmCo3.8Fe0.2B, and Sm0.7Nd0.3Co3.8Fe0.2B will be synthesized and a similar procedure which is described above will be followed to determine their intrinsic magnetic properties such as saturation magnetization, anisotropy field and Curie temperature.