Realization of ground-state artificial skyrmion lattices at room temperature

Gilbert, Dustin A.; Maranville, Brian B.; Balk, Andrew L.; Kirby, Brian J.; Fischer, Peter; Pierce, Daniel T.; Unguris, John; Borchers, Julie A.; Liu, Kai

doi:10.1038/ncomms9462

Title: Realization of ground-state artificial skyrmion lattices at room temperature

Journal Article · Thu Oct 08 00:00:00 EDT 2015 · Nature Communications

DOI:https://doi.org/10.1038/ncomms9462· OSTI ID:1252990

Gilbert, Dustin A. ^[1]; Maranville, Brian B. ^[2]; Balk, Andrew L. ^[3]; Kirby, Brian J. ^[2]; Fischer, Peter ^[4]; Pierce, Daniel T. ^[5]; Unguris, John ^[5]; Borchers, Julie A. ^[2]; Liu, Kai ^[6]

Univ. of California, Davis, CA (United States). Dept. of Physics; National Institute of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
National Institute of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
National Institute of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Nanoscale Science and Technology; Univ. of Maryland, College Park, MD (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Santa Cruz, CA (United States)
National Institute of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Nanoscale Science and Technology
Univ. of California, Davis, CA (United States). Dept. of Physics

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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05-CH11231; DMR-1008791; ECCS-1232275; AC02-05CH11231

OSTI ID:: 1252990

Alternate ID(s):: OSTI ID: 1378586

Journal Information:: Nature Communications, Vol. 6; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 172 works

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