Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 30: Functional Antiferromagnetism
MA 30.10: Talk
Wednesday, March 11, 2026, 12:00–12:15, POT/0151
Rocket-like dynamics of ferrimagnetic domain walls in graded magnets — •Pietro Diona1,2, Sergey Artyukhin2, and Luca Maranzana2,3 — 1Scuola Normale Superiore di Pisa, Pisa, Italia — 2Istituto Italiano di Tecnologia, Genova, Italia — 3Università di Genova, Genova, Italia
The domain wall motion underpins emerging spintronic technologies, such as high-speed racetrack devices and THz logic. Spatially nonuniform magnetic exchange and anisotropy in ferromagnets can pin or accelerate domain walls [1,2]. In ferrimagnets, where Walker breakdown is suppressed, domain walls can therefore approach the magnon speed [3]. Here we show that in non-uniform ferrimagnets such gradients not only exert a net force on the ferrimagnetic domain walls, but also modify the effective mass of the wall, enabling an entirely new acceleration mechanism. As a domain wall travels through regions of varying exchange or anisotropy, it can shed or gain effective mass leading to a "rocket effect" as in variable-mass systems. This phenomenon becomes increasingly pronounced as the wall approaches the magnon velocity [3], providing a natural route to ultrafast domain-wall propulsion. Our analytical theory, supported by micromagnetic simulations, suggests strategies for mass control in racetrack devices. These results establish variable-mass domain walls as a new paradigm for efficient, high-velocity spintronics and THz-frequency magnetic technologies.
[1] F. N. Tan et al., Scient. Rep., 9, 7369 (2019).
[2] P. Diona et al., IEEE Trans. on Elec. Dev., 69(7), 3675 (2022).
[3] P. Diona et al., Adv. Func. Mat., e22549 (2025).
Keywords: domain wall; magnon speed; ferrimagnets; inertia