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MA: Fachverband Magnetismus

MA 29: Spin Transport and Orbitronics, Spin-Hall Effects I (joint session MA/TT)

MA 29.10: Vortrag

Mittwoch, 11. März 2026, 12:15–12:30, POT/0112

Giant orbital magnetoresistance in orbital magnets — •Sachin Krishnia¹, Christin Schmitt¹, Edgar Galindez Ruales¹, Takashi Kikkawa², Timo Kuschel¹, Eiji Saitoh², Olena Gomonay¹, Yuriy Mokrousov¹, and Mathias Kläui¹ — ¹Institute of Physics, Johannes Gutenberg-University Mainz, Mainz, Germany — ²Department of Applied Physics, The University of Tokyo, Tokyo, Japan

Generation and transport of large orbital angular momentum (OAM) currents have recently emerged as a key research area in the field of orbitronics. In contrast to spin currents, whose generation depends on weak spin-orbit coupling, OAM currents arise directly from the coupling between crystal momentum and electronic OAM even in light and environmentally friendly materials (Cu, Al, Cr)[1]. A major challenge has been to exploit these giant orbital currents in magnetic systems, where static magnetization is dominated by spin. We show that this limitation can be overcome by employing magnetic materials in which OAM contributes significantly to the static magnetization. Using these orbital magnets, we demonstrate two orders of enhancement of orbital Hall magnetoresistance, compared to the spin counterpart. This enhancement originates from the interaction of the dynamic OAM generated in light metals with the static orbital moments of the orbital magnet. Our results establish a pathway to harness giant OAM currents for device functionalities that cannot be achieved with conventional spin-dominated magnets[2]. [1] S. Ding et al, PRL 125, 177201 (2020). [2] C. Schmitt, S. Krishnia et al. (under review).

Keywords: orbital angular momentum current; orbital magnetization; orbital magnetoresistance