Dependence of Dzyaloshinskii-Moriya interaction on the oxygen coverage in Pt/Co/MOx trilayers

Dayane de Souza Chaves; Fernando Ajejas; Viola Krizakova; Jan Vogel; Stefania Pizzini

doi:10.1103/PhysRevB.99.144404

Dependence of Dzyaloshinskii-Moriya interaction on the oxygen coverage in Pt/Co/MOx trilayers

Materials Science 2019-04-10 v1

Authors: Dayane de Souza Chaves , Fernando Ajejas , Viola Krizakova , Jan Vogel , Stefania Pizzini

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Abstract

We have studied the interfacial Dzyaloshinskii-Moriya interaction (DMI) in a series of Pt/Co/MOx (M=Al, Gd) trilayers in which the degree of oxidation of the top Co interface is varied. To access to reliable values of the DMI strength, we have used a method based on the measurement of the saturation velocity of field driven chiral N\'eel domain walls. We show that the effective DMI strength in the Pt/Co/MOx trilayers varies with the oxidation degree of the Co/MOx interface. This strongly suggests that the Co/MOx interface gives a distinct contribution to the total DMI, adding to that of the Pt/Co interface. The DMI presents a maximum for the oxygen coverage maximizing also the interface magnetic anisotropy energy Ks. This calls for common microscopic origins for the contributions of the Co/MOx interface to DMI and Ks.

Keywords

Dzyaloshinskii-Moriya interaction interfacial magnetic anisotropy chiral Néel domain walls Pt/Co/MOx trilayers oxygen coverage

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@article{arxiv.1708.08516,
  title  = {Dependence of Dzyaloshinskii-Moriya interaction on the oxygen coverage in Pt/Co/MOx trilayers},
  author = {Dayane de Souza Chaves and Fernando Ajejas and Viola Krizakova and Jan Vogel and Stefania Pizzini},
  journal= {arXiv preprint arXiv:1708.08516},
  year   = {2019}
}

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6 pages, 4 Figures

Dependence of Dzyaloshinskii-Moriya interaction on the oxygen coverage in Pt/Co/MOx trilayers

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