Extended exchange interactions stabilize long-period magnetic structures in Cr1/3NbS2

A. A. Aczel; L. M. Debeer-Schmitt; T. J. Williams; M. A. McGuire; N. J. Ghimire; L. Li; D. Mandrus

doi:10.1063/1.5038021

Extended exchange interactions stabilize long-period magnetic structures in Cr_1/3NbS₂

A. A. Aczel, L. M. Debeer-Schmitt, T. J. Williams, M. A. McGuire, N. J. Ghimire, L. Li, D. Mandrus

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

The topologically protected, chiral soliton lattice is a unique state of matter offering intriguing functionality, and it may serve as a robust platform for storing and transporting information in future spintronic devices. While the monoaxial chiral magnet Cr_1/3NbS₂ is known to host this exotic state in an applied magnetic field, its detailed microscopic origin has remained a matter of debate. Here, we work towards addressing this open question by measuring the spin wave spectrum of Cr_1/3NbS₂ over the entire Brillouin zone with inelastic neutron scattering. The well-defined spin wave modes allow us to determine the values of several microscopic interactions for this system. The experimental data are well-explained by a Heisenberg Hamiltonian with exchange constants up to the third nearest neighbor and an easy plane magnetocrystalline anisotropy term. Our work shows that both the second and third nearest neighbor exchange interactions contribute to the formation of the helimagnetic and chiral soliton lattice states in this robust three-dimensional magnet.

Original language	English
Article number	032404
Journal	Applied Physics Letters
Volume	113
Issue number	3
DOIs	https://doi.org/10.1063/1.5038021
State	Published - Jul 16 2018

Funding

We thank M. B. Stone for technical support. M.A.M. acknowledges support from the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. A portion of this research used resources at the Spallation Neutron Source and the High Flux Isotope Reactor, which are DOE Office of Science User Facilities operated by Oak Ridge National Laboratory.

Funders	Funder number
U.S. Department of Energy
Office of Science
Basic Energy Sciences
Oak Ridge National Laboratory
Division of Materials Sciences and Engineering

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abstract = "The topologically protected, chiral soliton lattice is a unique state of matter offering intriguing functionality, and it may serve as a robust platform for storing and transporting information in future spintronic devices. While the monoaxial chiral magnet Cr1/3NbS2 is known to host this exotic state in an applied magnetic field, its detailed microscopic origin has remained a matter of debate. Here, we work towards addressing this open question by measuring the spin wave spectrum of Cr1/3NbS2 over the entire Brillouin zone with inelastic neutron scattering. The well-defined spin wave modes allow us to determine the values of several microscopic interactions for this system. The experimental data are well-explained by a Heisenberg Hamiltonian with exchange constants up to the third nearest neighbor and an easy plane magnetocrystalline anisotropy term. Our work shows that both the second and third nearest neighbor exchange interactions contribute to the formation of the helimagnetic and chiral soliton lattice states in this robust three-dimensional magnet.",

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AU - Ghimire, N. J.

AU - Li, L.

AU - Mandrus, D.

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Extended exchange interactions stabilize long-period magnetic structures in Cr_1/3NbS₂

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