Magnetic alignment technology using the modulated rotating magnetic fields (MRF) enables formation of tri-axial grain arrangement of the substances with tri-axial magnetic anisotropy. In this review, we introduce a high potential of magnetic alignment technique as the fabrication process of tri-axially grain-oriented cuprate superconductors. As the first topic, we reported the tri-axial magnetic alignment of rare-earth-based and bismuth-based cuprate superconductors operated at room temperature. In the second topic, we show the importance of single-ion magnetic anisotropy of the rare-earth ions as a determination factor of magnetization axes and the tri-axial magnetic anisotropy in rare-earth-based cuprate superconductors. The final topic is the fabrication of tri-axially grain-aligned ErBa2Cu4O8 (Er124) ceramics under a modified MRF. To date, the Er124 ceramic with the degree of in-plane orientation with ~11 degree has been successfully fabricated by controlling the viscosity of slurry and introducing the oscillation type of MRF.
The magnetic field effects on the synthesis process, decomposition process, and the phase equilibrium of materials have been investigated via thermal analysis experiments in high magnetic fields (HF-DTA). In this review, the thermal analysis systems in high magnetic fields are described. The typical results obtained by HF-DTA are presented. The magnetic field effects on the synthesis process of the high-Tc superconductors and the phase equilibrium of ferromagnetic materials are described. The results of HF-DTA experiments show that the phase equilibriums of Bi-Mn system and Fe-C alloys are drastically changed by applying high magnetic fields. In addition, HF-DTA experiments were performed for various compositions of Bi-Mn alloys. BiMn binary phase diagrams in high magnetic fields were shown. The magnetic field effects on the phase equilibrium were discussed in the basis of Zeeman energy of the ferromagnetic phase.