Journal
ADVANCED MATERIALS
Volume 32, Issue 14, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201904415
Keywords
antiferromagnetic order; interfacial Dzyaloshinskii-Moriya interaction; magnetic topological states; multiferroic heterostructures; topological Hall effect
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Funding
- Singapore National Research Foundation under CRP award [NRF-CRP10-2012-02]
- Singapore Ministry of Education [MOE2018-T2-1-019, MOE2018-T2-2-043, AMEIRG18-0022]
- A*STAR [IAF-ICP 11801E0036]
- MOE Tier 1 [FY2018-P23, R-284-000-196-114]
- National 973 Program of China [2015CB654901]
- National Natural Science Foundation of China [11234011, 51590883, 51701217]
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Topologically protected magnetic states have a variety of potential applications in future spintronics owing to their nanoscale size (<100 nm) and unique dynamics. These fascinating states, however, usually are located at the interfaces or surfaces of ultrathin systems due to the short interaction range of the Dzyaloshinskii-Moriya interaction (DMI). Here, magnetic topological states in a 40-unit cells (16 nm) SrRuO3 layer are successfully created via an interlayer exchange coupling mechanism and the interfacial DMI. By controlling the thickness of an antiferromagnetic and ferromagnetic layer, interfacial ionic polarization, as well as the transformation between ferromagnetic and magnetic topological states, can be modulated. Using micromagnetic simulations, the formation and stability of robust magnetic skyrmions in SrRuO3/BiFeO3 heterostructures are elucidated. Magnetic skyrmions in thick multiferroic heterostructures are promising for the development of topological electronics as well as rendering a practical approach to extend the interfacial topological phenomena to bulk via antiferromagnetic order.
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