Publications by authors named "Andrey Stashkevich"

In this article, we present a numerical study on stabilization and eigenmodes of the so-called skyrmion chiral spin texture in nanometric dots. The first aim of this study is to identify the appropriate multilayer in a set of Pt/Co/MgO structures with different Co thicknesses that have been previously experimentally characterized. Stabilization occurs if the energy favoring skyrmions is greater than the geometric mean of the exchange and anisotropy energies.

View Article and Find Full Text PDF

The manipulation of magnetization with interfacial modification using various spin-orbit coupling phenomena has been recently revisited due to its scientific and technological potential for next-generation memory devices. Herein, we experimentally and theoretically demonstrate the interfacial Dzyaloshinskii-Moriya interaction characteristics penetrating through a MgO dielectric layer inserted between the Pt and CoFeSiB. The inserted MgO layer seems to function as a chiral exchange interaction mediator of the interfacial Dzyaloshinskii-Moriya interaction from the heavy metal atoms to ferromagnet ones.

View Article and Find Full Text PDF

Electric control of magnetism is a prerequisite for efficient and low-power spintronic devices. More specifically, in heavy metal-ferromagnet-insulator heterostructures, voltage gating has been shown to locally and dynamically tune magnetic properties such as interface anisotropy and saturation magnetization. However, its effect on interfacial Dzyaloshinskii-Moriya Interaction (DMI), which is crucial for the stability of magnetic skyrmions, has been challenging to achieve and has not been reported yet for ultrathin films.

View Article and Find Full Text PDF
Article Synopsis
  • Magnetic skyrmions are unique spin structures with a twisted configuration, ideal for manipulating magnetization on a nanoscale due to their small size and movement capabilities with low current densities.
  • Previous experiments have only demonstrated these skyrmions in bulk materials or thin films, but this study showcases their stability in ultrathin Pt/Co/MgO nanostructures at room temperature and without an external magnetic field.
  • The internal structure of these skyrmions was studied using advanced X-ray techniques, revealing strong Dzyaloshinskii-Moriya interaction, and the findings were supported by computer simulations that explain their size and stability.
View Article and Find Full Text PDF