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MA: Fachverband Magnetismus
MA 63: Spin: Transport, Orbitronics and Hall Effects III
MA 63.11: Vortrag
Freitag, 20. März 2020, 12:15–12:30, HSZ 403
Spin-Hall Nano-oscillators, optimized shape and fabrication strategies — •Stephanie Lake1, Philipp Dürrenfeld1, Frank Heyroth2, and Georg Schmidt1, 2 — 1Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle, Germany — 2Interdisziplinäres Zentrum für Materialwissenschaften, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle, Germany
Spin Hall nano-oscillators (SHNOs), typically a bilayer device comprised of Pt and a thin film of ferromagnetic material, exhibit auto-oscillations when spin transfer torque cancels out the damping torque applied on magnetization precession. Several publications focused on Py-based SHNOs with nanoconstrictions (NCs) show that high frequency (HF) electrical signals can be generated by taking advantage of the anisotropic magnetoresistance (AMR) effect in Py1. However, practical use of these HF signals is challenging due to their low power1. To increase power, one can improve auto-oscillations in SHNOs by manipulating its geometry and material parameters.
This work is a systematic investigation of Py-based SHNOs fabricated using different electron beam lithography (EBL) strategies to optimize shape and size of the constriction. We show simulations of the static field within NCs for geometries we want to pattern with EBL and subsequent fabrication attempts. Furthermore, we obtain the AMR ratio and Gilbert damping constant of our devices. Understanding how EBL affects SHNO characteristics will allow for future optimization.
1Awad, A. A. et al., Nat. Phys. 13, 292299 (2016).