Robust mutual synchronization of long spin Hall nano-oscillator chains

ORAL

Abstract

Mutual synchronization of spin Hall nano-oscillators (SHNOs)1 in chains2 and 2D arrays3 can increase the signal quality an order of magnitude and be used for neuromorphic computing and Ising Machines4,5. Here, we explore mutual synchronization in long SHNO chains of both NiFe(4 nm)/Pt(5 nm) and W(5 mm)/CoFeB(1.4 nm)/MgO(2 nm) and demonstrate robust synchronization of up to 21 SHNOs. A 300 kHz linewidth (for NiFe/Pt) and very high quality factors (Q=f/△f) of >30,000 for NiFe/Pt and >25000 for W/CoFeB/MgO are the best reported numbers for SHNO chains. Their wide frequency tunability (2-28 GHz)6 with current and magnetic fields along with their large non-linearity, make these oscillators ideal candidates for various spintronic applications.

 

References:

1. T. Chen et al., Proc. IEEE 104, 1919 (2016)

2. A. A. Awad et al., Nat. Phys. 13, 292 (2017).

3. M. Zahedinejad et al., Nat. Nano. 15, 47 (2020)

4. D. I. Albertsson et al., Appl. Phys. Lett. 118, 112404 (2021)

5. A. Houshang et al., arXiv:2006.02236.

6. M. Zahedinejad et al., Appl. Phys. Lett. 112, 132404 (2018)

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Publication: 1. Robust mutual synchronization in long spin Hall nano-oscillator chains, planned paper.

Presenters

  • Akash Kumar

    • University of Gothenburg
    • Physics Department, University of Gothenburg

Authors

  • Akash Kumar

    • University of Gothenburg
    • Physics Department, University of Gothenburg

  • Mohammad Zahedinejad

    • University of Gothenburg
    • NanOsc AB, Gothenburg, Sweden

  • Himanshu Fulara

    • Indian Institute of Technology Roorkee
    • 1Physics Department, University of Gothenburg, 41296 Gothenburg, Sweden. 2Department of Physics, Indian Institute of Technology Roorkee, Roorkee 247667, India
    • Indian Institute of Technology Roorkee, India
    • Physics Department, University of Gothenburg

  • Roman Khymyn

    • University of Gothenburg, Sweden
    • University of Gothenburg
    • Physics Department, University of Gothenburg
    • Physics Department, University of Gothenburg, 412 96 Gothenburg, Sweden

  • Ahmad A. Awad

    • University of Gothenburg

  • Afshin Houshang

    • University of Gothenburg
    • 1Physics Department, University of Gothenburg, 41296 Gothenburg, Sweden.
    • Physics Department, University of Gothenburg

  • Mykola Dvornik

    • NanOsc AB
    • NanOsc AB, Gothenburg, Sweden.
    • University of Gothenburg, Sweden
    • Physics Department, University of Gothenburg, 412 96 Gothenburg, Sweden.

  • Johan Åkerman

    • Goteborg Univ
    • University of Gothenburg
    • 1Physics Department, University of Gothenburg, 41296 Gothenburg, Sweden.
    • University of Gothenburg, Sweden
    • Physics Department, University of Gothenburg
    • Physics Department, University of Gothenburg, 412 96 Gothenburg, Sweden