Ultrafast Racetrack Based on Compensated Co/Gd-Based Synthetic Ferrimagnet with All-Optical Switching

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Spin-orbitronics and single pulse all-optical switching (AOS) of magnetization are two major successes of the rapidly advancing field of nanomagnetism in recent years, with high potential for enabling novel, fast, and energy-efficient memory and logic platforms. Fast current-induced domain wall motion (CIDWM) and single shot AOS have been individually demonstrated in different ferrimagnetic alloys. However, the stringent requirement for their composition control makes these alloys challenging materials for wafer scale production. Here, fast CIDWM and energy efficient AOS in a synthetic ferrimagnetic system based on multilayered [Co/Gd]2 are simultaneously demonstrated. First, it is shown that AOS is present in its full composition range. It is found that current-driven domain wall velocities over 2000 m s-1 at room temperature, achieved by compensating the total angular momentum through layer thickness tuning. Furthermore, analytical modeling of the CIDWM reveals that Joule heating needs to be treated transiently to properly describe the CIDWM for our sub-ns current pulses. The studies establish [Co/Gd]-based synthetic ferrimagnets to be a unique materials platform for domain wall devices with access to ultrafast single pulse AOS.
Original languageEnglish
Article number2200613
Number of pages5
JournalAdvanced Electronic Materials
Issue number1
Early online date26 Oct 2022
Publication statusPublished - Jan 2023


FundersFunder number
European Union's Horizon 2020 - Research and Innovation Framework Programme860060
Marie Skłodowska‐Curie
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Horizon 2020


    • all-optical switching
    • angular momentum compensation
    • current-induced domain wall motion
    • synthetic ferrimagnets


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