A spin torque nano oscillator model based on Dzyaloshinskii–Moriya interaction in the IMA/PMA bilayered spin valve nanopillar: Micromagnetic study

• Published in: Physica. B, Condensed matter Condensed matter, 2024-03, Vol.677, p.415714, Article 415714
• Main Authors: Hanif, Anam, Rahim, Arbab Abdur, Maab, Husnul
• Format: Article
• Language: English
• Subjects: Dzyaloshinskii–Moriya (DM) exchange; Hybrid polarizer; In-plane magnetic anisotropy (IMA); Micromagnetic simulation; Perpendicular magnetic anisotropy (PMA); Ruderman–Kittel–Kasuya–Yosida (RKKY) interaction
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/j.physb.2024.415714

A spin valve structure comprising two free layers based on skyrmion with perpendicular magnetic anisotropy (PMA) and a vortex with in-plane magnetic anisotropy (IMA) is investigated using micromagnetic simulation methods. The investigation reveals an interfacial Dzyaloshinskii–Moriya (DM) exchange interaction between the layers, leading to the transfer of DM energy from the skyrmion to the vortex layer, resulting in an increased frequency of vortex core oscillation. Also, the Ruderman–Kittel–Kasuya–Yosida (RKKY) interaction between IMA and PMA layers induces magnetization oscillations with increased amplitude. The hybrid polarizer’s dimensions, current density, IMA layer thickness, DM field strength, bilinear surface exchange energy coefficient, and damping coefficient can be adjusted to manipulate this effect. This structure holds promising potential for generating robust oscillations with an increased frequency of vortex core gyration, facilitated by the DM and RKKY interactions; moreover, the integration of skyrmion and vortex presents a novel approach to controlling magnetic properties in nanoscale devices. •A spin valve nanopillar with IMA/PMA layers.•Enhanced DM exchange boosts vortex core oscillation frequency.•RKKY interaction induces amplified magnetization oscillations.•Potential for Spin Torque Nano Oscillators (STNOs).