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Title: Intrinsic synchronization of an array of spin-torque oscillators driven by the spin-Hall effect

This paper micromagnetically studies the magnetization dynamics driven by the spin-Hall effect in a Platinum/Permalloy bi-layer. For a certain field and current range, the excitation of a uniform mode, characterized by a power with a spatial distribution in the whole ferromagnetic cross section, is observed. We suggest to use the ferromagnet of the bi-layer as basis for the realization of an array of spin-torque oscillators (STOs): the Permalloy ferromagnet will act as shared free layer, whereas the spacers and the polarizers are built on top of it. Following this strategy, the frequency of the uniform mode will be the same for the whole device, creating an intrinsic synchronization. The synchronization of an array of parallely connected STOs will allow to increase the output power, as necessary for technological applications.
Authors:
; ; ; ;  [1] ;  [2] ;  [3] ;  [4]
  1. Department of Electronic Engineering, Industrial Chemistry and Engineering, University of Messina, C.da di Dio, I-98166 Messina (Italy)
  2. Department of Computer Science, Modelling, Electronics and System Science, University of Calabria, Via P. Bucci, I-87036 Rende (CS) (Italy)
  3. Department of Informatic Engineering and Telecommunications, University of Catania, Viale Andrea Doria 6, 95125 Catania (Italy)
  4. Department of Electrical and Information Engineering, Politecnico of Bari, via E. Orabona 4, I-70125 Bari (Italy)
Publication Date:
OSTI Identifier:
22410155
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; EXCITATION; FERROMAGNETIC MATERIALS; FERROMAGNETISM; HALL EFFECT; LAYERS; MAGNETIZATION; OSCILLATORS; PERMALLOY; PLATINUM; SPACERS; SPATIAL DISTRIBUTION; SPIN; SYNCHRONIZATION; TORQUE