Dresden 2020 – wissenschaftliches Programm
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MA 53.7: Vortrag
Donnerstag, 19. März 2020, 16:30–16:45, HSZ 401
Twisting and tweezing the spin wave: on helical waves, and the magnonic spiral phase plate — •Alexander F. Schäffer1, Decheng Ma2, Chenglong Jia2, and Jamal Berakdar1 — 1Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle (Saale), Germany — 2Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education & Institute of Theoretical Physics, Lanzhou University, China
Spin waves are the low-energy excitations of magnetically ordered materials. They are key elements in the stability analysis of the ordered phase and have a wealth of technological applications. Recently, we showed that spin waves of a magnetic nanowire may carry a definite amount of orbital angular momentum components along the propagation direction. This helical, in addition to the chiral, character of the spin waves is related to the spatial modulations of the spin wave phase across the wire. It, however, remains a challenge to generate and control such modes with conventional magnetic fields. Therefore, we propose a magnetic heterostructure that acts as a magnetic spiral phase plate by appropriately synthesizing two magnetic materials that have different speeds of spin waves. In this contribution, we discuss the key features of helical spin waves and demonstrate the functionality of the magnonic spiral phase plate with micromagnetic simulations.
 C. Jia, D. Ma, A. F. Schäffer, J. Berakdar, Nat. Commun. 10, 2077 (2019).
 C. Jia, D. Ma, A. F. Schäffer, J. Berakdar, J. Opt. 21, 12 (2019).