Variation of sign and magnitude of the Dzyaloshinskii-Moriya interaction of a ferromagnet with an oxide interface

Arora, Monika; Shaw, Justin M.; Nembach, Hans T.

doi:10.1103/physrevb.101.054421

Variation of sign and magnitude of the Dzyaloshinskii-Moriya interaction of a ferromagnet with an oxide interface

Journal Article · Mon Feb 17 23:00:00 EST 2020 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.101.054421· OSTI ID:1803124

^[1]; Shaw, Justin M. ^[2]; Nembach, Hans T. ^[3]

National Inst. of Standards and Technology (NIST), Boulder, CO (United States); Univ. of Colorado, Boulder, CO (United States); OSTI
National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
National Inst. of Standards and Technology (NIST), Boulder, CO (United States); Univ. of Colorado, Boulder, CO (United States)

We demonstrate that both the magnitude and sign of the Dzyaloshinskii-Moriya interaction can be tuned by modifying the type and thickness of an oxide layer adjacent to a ferromagnet. In this work, we focus on Ti/Cu/Co₉₀Fe₁₀/Ta($$d_{\text{Ta}}$$)/Oxide/Ta structures, where the Ta interlayer thickness $$d_{\text{Ta}}$$ ranged from 0 nm to 3 nm, followed by an exposure to oxygen and “Oxide” can mean CoFeO_x and/or TaO_x. We used Brillouin light scattering spectroscopy to directly determine the volume-averaged Dzyaloshinskii-Moriya interaction from the nonreciprocity of the spin-wave frequency. The magnitude of the interfacial Dzyaloshinskii-Moriya interaction, $$D_{\text{DMI}}$$, ranges from – 0.17 to +0.09(±0.02) mJ/m², clearly showing a change in both sign and magnitude, with an increase of Ta interlayer thickness. The modification of the oxide interface allows us to systematically change the hybridization of the 3$$\textit{d}$$–CoFe orbitals from 3$$\textit{d}$$–5$$\textit{d}$$ to 3$$\textit{d}$$–2$$\textit{p}$$ and analyze the influence on the Dzyaloshinskii-Moriya interaction. Importantly, we can vary the Dzyaloshinskii-Moriya interaction while maintaining a relatively small value of the damping parameter.

View Accepted Manuscript (DOE)

Research Organization:: National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)

Sponsoring Organization:: USDOE Office of Science (SC); Defense Advanced Research Projects Agency (DARPA)

Grant/Contract Number:: SC0017643

OSTI ID:: 1803124

Alternate ID(s):: OSTI ID: 1600068

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 5 Vol. 101; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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