Temperature-dependent magnetism in artificial honeycomb lattice of connected elements

B. Summers, L. Debeer-Schmitt, A. Dahal, A. Glavic, P. Kampschroeder, J. Gunasekera, D. K. Singh

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Artificial magnetic honeycomb lattices are expected to exhibit a broad and tunable range of novel magnetic phenomena that would be difficult to achieve in natural materials, such as long-range spin ice, entropy-driven magnetic charge-ordered states, and spin order due to the spin chirality. Eventually, the spin correlation is expected to develop into a unique spin-solid-state-density ground state, manifested by the distribution of the pairs of vortex states of opposite chirality. Here we report the creation of an artificial permalloy honeycomb lattice of ultrasmall connecting bonds, with a typical size of ≃12 nm. Detailed magnetic and neutron-scattering measurements on the newly fabricated honeycomb lattice demonstrate the evolution of magnetic correlation as a function of temperature. At low enough temperature, neutron-scattering measurements and micromagnetic simulation suggest the development of a loop state of vortex configuration in this system.

Original languageEnglish
Article number014401
JournalPhysical Review B
Volume97
Issue number1
DOIs
StatePublished - Jan 3 2018

Funding

We acknowledge helpful discussions with Giovanni Vignale. The research at MU was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, under Grant No. DE-SC0014461. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. B.S. acknowledges the NSF IGERT fellowship at MU under Grant No. DGE-1069091.

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