Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 60: Spintronics (other effects) (joint session MA/TT)
TT 60.10: Talk
Wednesday, March 11, 2026, 17:45–18:00, POT/0112
Spin vacuum switching — •Eddie Harris-Lee1,2, John Kay Dewhurst2, Samuel Shallcross1, and Sangeeta Sharma1,3 — 1Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Berlin, Germany. — 2Max-Planck-Institut für Mikrostrukturphysik, Halle, Germany. — 3Institut für Theoretische Physik, Freie Universität Berlin, Berlin, Germany.
While physical mechanisms underpinning spin switching are established for nano- to pico-second time scales, here we present a physical route to magnetization toggle control at < 100 femtoseconds. A minority spin current injected into a ferromagnet is shown to create a minority “spin vacuum" that then drives rapid charge redistribution from the majority channel and spin switching. We demonstrate this mechanism reproduces many of the features of recent sub-picosecond switching of ferromagnetic Co/Pt multilayers, and provide simple practical rules for the design of materials to optimize “spin vacuum" control over magnetic order.
Harris-Lee et al., Sci. Adv. 10, eado6390 (2024). DOI:10.1126/sciadv.ado6390
Keywords: Ultrafast; Magnetism; Spin current; Dynamics; First principles