In magnets, the magnetic moments show some order at low temperatures. While all the magnetic moments point the same direction in a simple ferromagnet, many magnets show more complex orders. For example, Fig. 1 shows a magnetic texture, skyrmion lattice[1]. The topology of skyrmion affects the electron dynamics, showing a nontrivial electromagnetic response such as the giant Hall effect. Reciprocally, in another case, an electric current affects magnetic structure. Figure 2 shows the response to the electric current in a helical spin structure[2]. The rotational direction of a helical magnetic structure depends on whether the magnetic field and electric current are parallel or antiparallel. We explore novel phenomena/functionality of magnets, utilizing topology and symmetry.

Reference

• [1] X. Z. Yu, Y. Onose et al., Nature 465, 901 (2010).
• [2] N. Jiang, Y. Nii, H. Arisawa, E. Saitoh, Y. Onose, Nature Communications 11, 1601 (2020).