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Title: Pumping of magnons in a Dzyaloshinskii-Moriya ferromagnet

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Publication Date:
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
Grant/Contract Number:
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 16; Related Information: CHORUS Timestamp: 2017-04-05 22:12:02; Journal ID: ISSN 2469-9950
American Physical Society
Country of Publication:
United States

Citation Formats

Kovalev, Alexey A., Zyuzin, Vladimir A., and Li, Bo. Pumping of magnons in a Dzyaloshinskii-Moriya ferromagnet. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.95.165106.
Kovalev, Alexey A., Zyuzin, Vladimir A., & Li, Bo. Pumping of magnons in a Dzyaloshinskii-Moriya ferromagnet. United States. doi:10.1103/PhysRevB.95.165106.
Kovalev, Alexey A., Zyuzin, Vladimir A., and Li, Bo. Wed . "Pumping of magnons in a Dzyaloshinskii-Moriya ferromagnet". United States. doi:10.1103/PhysRevB.95.165106.
title = {Pumping of magnons in a Dzyaloshinskii-Moriya ferromagnet},
author = {Kovalev, Alexey A. and Zyuzin, Vladimir A. and Li, Bo},
abstractNote = {},
doi = {10.1103/PhysRevB.95.165106},
journal = {Physical Review B},
number = 16,
volume = 95,
place = {United States},
year = {Wed Apr 05 00:00:00 EDT 2017},
month = {Wed Apr 05 00:00:00 EDT 2017}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevB.95.165106

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  • The interfacial Dzyaloshinskii-Moriya interaction (iDMI), surface anisotropy energy, and spin pumping at the Ir/Co interface are experimentally investigated by performing Brillouin light scattering. Contrary to previous reports, we suggest that the sign of the iDMI at the Ir/Co interface is the same as in the case of the Pt/Co interface. We also find that the magnitude of the iDMI energy density is relatively smaller than in the case of the Pt/Co interface, despite the large strong spin-orbit coupling (SOC) of Ir. The saturation magnetization and the perpendicular magnetic anisotropy (PMA) energy are significantly improved due to a strong SOC. Ourmore » findings suggest that an SOC in an Ir/Co system behaves in different ways for iDMI and PMA. Finally, we determine the spin pumping effect at the Ir/Co interface, and it increases the Gilbert damping constant from 0.012 to 0.024 for 1.5 nm-thick Co.« less
  • Systems that exhibit topologically protected edge states are interesting both from a fundamental point of view as well as for potential applications, the latter because of the absence of backscattering and robustness to perturbations. It is desirable to be able to control and manipulate such edge states. Here, we demonstrate using a semi-analytical model that artificial square ices can incorporate both features: an interfacial Dzyaloshinksii-Moriya gives rise to topologically non-trivial magnon bands, and the equilibrium state of the spin ice is reconfigurable with different states having different magnon dispersions and topology. Micromagnetic simulations are used to determine the magnetization equilibriummore » states and to validate the semi-analytical model. Lastly, our results are amenable to experimental verification via, e.g., lithographic patterning and micro-focused Brillouin light scattering.« less
  • Neutron-diffraction and inelastic-scattering experiments are used to investigate in detail the field dependence of the magnetic structure and low-energy spin-wave spectrum of the Dzyaloshinskii-Moriya helimagnet Ba{sub 2}CuGe{sub 2}O{sub 7}. The results suggest that the previously proposed model for the magnetism of this compound (an ideal sinusoidal spin spiral, stabilized by isotropic exchange and Dzyaloshinskii-Moriya interactions) needs to be refined. Both recent and previously published data can be quantitatively explained by taking into account the Kaplan-Shekhtman-Entin-Wohlman-Aharony term, a special magnetic anisotropy term that was predicted to always accompany Dzyaloshinskii-Moriya interactions in insulators. {copyright} {ital 1999} {ital The American Physical Society}
  • We report an observation of a commensurate-incommensurate phase transition in a Dzyaloshinskii-Moriya spiral magnet Ba{sub 2}CuGe {sub 2}O{sub 7} . The transition is induced by applying a magnetic field in the plane of spin rotation. In this experiment we have direct control over the strength of the commensurate potential, while the preferred incommensurate period of the spin system remains unchanged. Experimental results for the period of the soliton lattice and bulk magnetization as a function of external magnetic field are in quantitative agreement with theory. {copyright} {ital 1997} {ital The American Physical Society}