Realization of ground-state artificial skyrmion lattices at room temperature

The topological nature of magnetic skyrmions leads to extraordinary properties that provide new insights into fundamental problems of magnetism and exciting potentials for novel magnetic technologies. Prerequisite are systems exhibiting skyrmion lattices at ambient conditions, which have been elusiv...

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Bibliographic Details
Published in:Nature communications 2015-10, Vol.6 (1), p.8462-8462, Article 8462
Main Authors: Gilbert, Dustin A., Maranville, Brian B., Balk, Andrew L., Kirby, Brian J., Fischer, Peter, Pierce, Daniel T., Unguris, John, Borchers, Julie A., Liu, Kai
Format: Article
Language:English
Subjects:
142/126
639/766/119/997
639/766/25
639/766/483/1139
Applied physics
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Humanities and Social Sciences
Magnetic properties and materials
multidisciplinary
Quantum mechanics
Science
Science (multidisciplinary)
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Summary:The topological nature of magnetic skyrmions leads to extraordinary properties that provide new insights into fundamental problems of magnetism and exciting potentials for novel magnetic technologies. Prerequisite are systems exhibiting skyrmion lattices at ambient conditions, which have been elusive so far. Here, we demonstrate the realization of artificial Bloch skyrmion lattices over extended areas in their ground state at room temperature by patterning asymmetric magnetic nanodots with controlled circularity on an underlayer with perpendicular magnetic anisotropy (PMA). Polarity is controlled by a tailored magnetic field sequence and demonstrated in magnetometry measurements. The vortex structure is imprinted from the dots into the interfacial region of the underlayer via suppression of the PMA by a critical ion-irradiation step. The imprinted skyrmion lattices are identified directly with polarized neutron reflectometry and confirmed by magnetoresistance measurements. Our results demonstrate an exciting platform to explore room-temperature ground-state skyrmion lattices. Magnetic skyrmions are particle-like magnetization textures which may be manipulated in thin-film device applications. Here, the authors demonstrate the formation and control of room-temperature artificial skyrmion lattices in Co/Pd multilayers, defined by local ion irradiation and an array of magnetic vortex discs.
ISSN:2041-1723
2041-1723
DOI:10.1038/ncomms9462