Coexistence of distinct skyrmion phases observed in hybrid ferromagnetic/ferrimagnetic multilayers

Andrada-Oana Mandru (), Oğuz Yıldırım, Riccardo Tomasello, Paul Heistracher, Marcos Penedo, Anna Giordano, Dieter Suess, Giovanni Finocchio () and Hans Josef Hug ()
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Andrada-Oana Mandru: Swiss Federal Laboratories for Materials Science and Technology
Oğuz Yıldırım: Swiss Federal Laboratories for Materials Science and Technology
Riccardo Tomasello: Institute of Applied and Computational Mathematics, FORTH
Paul Heistracher: University of Vienna
Marcos Penedo: Swiss Federal Laboratories for Materials Science and Technology
Anna Giordano: University of Messina
Dieter Suess: University of Vienna
Giovanni Finocchio: University of Messina
Hans Josef Hug: Swiss Federal Laboratories for Materials Science and Technology

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract Materials hosting magnetic skyrmions at room temperature could enable compact and energetically-efficient storage such as racetrack memories, where information is coded by the presence/absence of skyrmions forming a moving chain through the device. The skyrmion Hall effect leading to their annihilation at the racetrack edges can be suppressed, for example, by antiferromagnetically-coupled skyrmions. However, avoiding modifications of the inter-skyrmion distances remains challenging. As a solution, a chain of bits could also be encoded by two different solitons, such as a skyrmion and a chiral bobber, with the limitation that it has solely been realized in B20-type materials at low temperatures. Here, we demonstrate that a hybrid ferro/ferri/ferromagnetic multilayer system can host two distinct skyrmion phases at room temperature, namely tubular and partial skyrmions. Furthermore, the tubular skyrmion can be converted into a partial skyrmion. Such systems may serve as a platform for designing memory applications using distinct skyrmion types.

Date: 2020
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DOI: 10.1038/s41467-020-20025-2

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