Optimizing magnetodipolar interactions for synchronizing vortex based spin-torque nano-oscillators

F. Abreu Araujo, A. D. Belanovsky, P. N. Skirdkov, K. A. Zvezdin, A. K. Zvezdin, N. Locatelli, R. Lebrun, J. Grollier, V. Cros, G. de Loubens, and O. Klein
Phys. Rev. B 92, 045419 – Published 22 July 2015

Abstract

We report on a theoretical study of the magnetodipolar coupling and synchronization between two vortex-based spin-torque nano-oscillators (STVOs). In this work we study the dependence of the coupling efficiency on the relative magnetization parameters of the vortices in the system. This study is performed in order to propose an optimized configuration of the vortices for synchronizing STVOs. For this purpose, we combine micromagnetic simulations, the Thiele equation approach, and the analytical macrodipole approximation model to identify the optimized configuration for achieving phase-locking between neighboring oscillators. Notably, we compare vortices configurations with parallel (P) core polarities and with opposite (AP) core polarities. We demonstrate that the AP core configuration exhibits a coupling strength about three times higher than in the P core configuration.

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  • Received 12 November 2014
  • Revised 16 June 2015

DOI:https://doi.org/10.1103/PhysRevB.92.045419

©2015 American Physical Society

Authors & Affiliations

F. Abreu Araujo*

  • Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Place Croix du Sud 1, 1348 Louvain-la-Neuve, Belgium

A. D. Belanovsky, P. N. Skirdkov, K. A. Zvezdin, and A. K. Zvezdin

  • A. M. Prokhorov General Physics Institute, RAS, Vavilova, 38 119991 Moscow, Russia and Moscow Institute of Physics and Technology, Institutskiy per. 9, 141700 Dolgoprudny, Russia

N. Locatelli, R. Lebrun, J. Grollier, and V. Cros

  • Unité Mixte de Physique CNRS/Thales, Avenue A. Fresnel 1, 91767 Palaiseau and Université Paris-Sud, 91405 Orsay, France

G. de Loubens and O. Klein§

  • Service de Physique de l'État Condensé (CNRS URA 2464), CEA Saclay, 91191 Gif-sur-Yvette, France

  • *abreuaraujo.flavio@gmail.com
  • Also at Istituto P.M. srl, via Grassi 4, 10138 Torino, Italy.
  • Present address: Institut d'Electronique Fondamentale, UMR CNRS 8622, Université Paris-Sud, 91405 Orsay, France.
  • §Present address: SPINTEC, UMR CEA/CNRS/UJF-Grenoble 1/Grenoble-INP, INAC, 38054 Grenoble, France.

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Issue

Vol. 92, Iss. 4 — 15 July 2015

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