Strain Induced Modulation of Dzyaloshinskii-Moriya interaction in Pt/Co Bilayer Devices: A Green's Function Approach.
ORAL
Abstract
We use first-principles calculations to study the strain induced control of Dzyaloshinskii-Moriya Interaction (DMI) in ultrathin Pt/Co films. We introduce a Greens function approach to calculate the DMI coefficients that compared to the super-cell and Generalized Bloch approaches is computationally more efficient and accurate. We investigate the dependence of the DMI coefficient for Pt/Co[111] bilayer device on the Pt and Co thicknesses. We compare the calculated results versus Co thickness with the reported experimental data, where we observe a relative agreement. Furthermore, we study the effects of normal and shear strains on the DMI tensor elements. We show that normal(shear) strain results in anisotropic Neel- (Bloch-)type DMI.
*The work is supported by NSF ERC-Translational Applications of Nanoscale Multiferroic Systems (TANMS)- Grant No. 1160504 and by NSF-Partnership in Research and Education in Materials (PREM) Grant No. DMR-1205734.
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Presenters
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Farzad Mahfouzi
- Department of Physics and Astronomy, California State University, Northridge
- Northridge, California State University
- California State University, Northridge