Effect of interfacial intermixing on the Dzyaloshinskii-Moriya interaction in Pt/Co/Pt

Adam W. J. Wells, Philippa M. Shepley, Christopher H. Marrows, and Thomas A. Moore
Phys. Rev. B 95, 054428 – Published 21 February 2017
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Abstract

We study the effect of sputter-deposition conditions, namely, substrate temperature and chamber base pressure, upon the interface quality of epitaxial Pt/Co/Pt thin films with perpendicular magnetic anisotropy. Here we define interface quality to be the inverse of the sum in quadrature of roughness and intermixing. We find that samples with the top Co/Pt layers grown at 250C exhibit a local maximum in roughness intermixing and that the interface quality is better for lower or higher deposition temperatures, up to 400C, above which the interface quality degrades. Imaging the expansion of magnetic domains in an in-plane field using wide-field Kerr microscopy, we determine the interfacial Dzyaloshinskii-Moriya interaction (DMI) in films in the deposition temperature range 100C to 300C. We find that the net DMI increases as the difference between top and bottom Co interface quality increases. Furthermore, for sufficiently low base pressures, the net DMI increases linearly with the deposition temperature, indicating that fine-tuning of the DMI may be achieved via the deposition conditions.

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  • Received 12 August 2016
  • Revised 20 January 2017

DOI:https://doi.org/10.1103/PhysRevB.95.054428

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Adam W. J. Wells*, Philippa M. Shepley, Christopher H. Marrows, and Thomas A. Moore

  • School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United Kingdom

  • *pyaww@leeds.ac.uk

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Issue

Vol. 95, Iss. 5 — 1 February 2017

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