Walid Bin Ali Wins English Lecture Encouragement Award from the Japan Society of Applied Physics

Walid Bin Ali (3rd year doctoral student) of the Solid State Physics Engineering Laboratory, Graduate School of Engineering, received the English Lecture Encouragement Award from the Japan Society of Applied Physics. This award is given by the Professional Group of Spintronics of the Japan Society of Applied Physics to students who have presented excellent English lectures that can contribute to the development of spintronics at the spring or autumn meeting of the Japan Society of Applied Physics. At the 2023 Spring Meeting, Mr. Ali presented a paper entitled “Improvement of Orientation degrees of Dy123 via Linear-drive type Modulated Rotating Magnetic Field” with Assistant Professor Adachi, Researcher Kimura, and Professor Horii.

In the Solid State Physics Engineering Laboratory, a new technology called linear-drive type modulated rotating magnetic field was developed. The technology generates a desired modulated rotating magnetic field (MRF) by linearly reciprocating an array of permanent magnets. They are conducting research to obtain high-performance materials by aligning the crystallographic axes of microcrystals with this technology. Until now, high-temperature superconducting materials aligned using this magnet array had a lower degree of orientation than expected. In this study, it was clarified that the degree of orientation differs depending on the sample placement position within the array magnet. Furthermore, in electromagnetic field simulations, it was found that the uniformity of the MRF is disturbed depending on the sample position. This is the reason for the low degree of orientation. By designing the appropriate magnet array it is possible to improve the uniformity of MRF and achieve higher orientation degrees in high-temperature superconducting materials.

Generally, single crystals are used as high-performance crystalline materials; however, the growth of single crystals requires a high temperature, precise temperature control, and a highly oriented substrate, making it expensive. There are materials that are not yet commercially available mainly due to these requirements. The linear-drive type MRF used in this study has the following advantages: it can be oriented at room temperature, it does not require a vacuum environment, and it allows continuous production of sheet-shaped samples, making it possible to produce long materials with high performance at low cost. This technology is expected to revolutionize material manufacturing processes.

（Tadayuki Imai, Faculty of Engineering）