Dzyaloshinskii–Moriya interaction in noncentrosymmetric superlattices
Abstrak
Abstract Dzyaloshinskii–Moriya interaction (DMI) is considered as one of the most important energies for specific chiral textures such as magnetic skyrmions. The keys of generating DMI are the absence of structural inversion symmetry and exchange energy with spin–orbit coupling. Therefore, a vast majority of research activities about DMI are mainly limited to heavy metal/ferromagnet bilayer systems, only focusing on their interfaces. Here, we report an asymmetric band formation in a superlattices (SL) which arises from inversion symmetry breaking in stacking order of atomic layers, implying the role of bulk-like contribution. Such bulk DMI is more than 300% larger than simple sum of interfacial contribution. Moreover, the asymmetric band is largely affected by strong spin–orbit coupling, showing crucial role of a heavy metal even in the non-interfacial origin of DMI. Our work provides more degrees of freedom to design chiral magnets for spintronics applications.
Topik & Kata Kunci
Penulis (9)
Woo Seung Ham
Abdul-Muizz Pradipto
Kay Yakushiji
Kwangsu Kim
Sonny H. Rhim
Kohji Nakamura
Yoichi Shiota
Sanghoon Kim
Teruo Ono
Akses Cepat
- Tahun Terbit
- 2021
- Sumber Database
- DOAJ
- DOI
- 10.1038/s41524-021-00592-8
- Akses
- Open Access ✓