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23 papers
Frequency Stability of Spin-Hall Nano-Oscillators with Realistic Grain Structure
Corrado Carlo Maria Capriata, Sheng Jiang, Mykola Dvornik +2
Nano-constriction spin-Hall nano-oscillators (NC-SHNOs) are one of the most promising alternatives among the microwave spintronics devices. They can provide highly coherent and wid…
Memristive control of mutual SHNO synchronization for neuromorphic computing
Mohammad Zahedinejad, Himanshu Fulara, Roman Khymyn +5
Synchronization of large spin Hall nano-oscillators (SHNO) arrays is an appealing approach toward ultra-fast non-conventional computing based on nanoscale coupled oscillator networ…
Impact of intra-grain spin wave reflections on nano-contact spin torque oscillators
Anders J. Eklund, Mykola Dvornik, Fatjon Qejvanaj +4
We investigate the origin of the experimentally observed varying current-frequency nonlinearity of the propagating spin wave mode in nano-contact spin torque oscillators. Nominally…
Giant voltage control of spin Hall nano-oscillator damping
Himanshu Fulara, Mohammad Zahedinejad, Roman Khymyn +5
Spin Hall nano-oscillators (SHNOs) are emerging spintronic devices for microwave signal generation and oscillator based neuromorphic computing combining nano-scale footprint, fast…
Micromagnetic Modeling of Telegraphic Mode Jumping in Microwave Spin Torque Oscillators
B. Gunnar Malm, Anders Eklund, Mykola Dvornik
The time domain stability of microwave spin torque oscillators (STOs) has been investigated by systematic micromagnetic simulations. A model based on internal spin wave reflection…
Sustained coherent spin wave emission using frequency combs
A. A. Awad, S. Muralidhar, A. Alemán +4
We demonstrate sustained coherent emission of spin waves in NiFe films using rapid demagnetization from high repetition rate femtosecond laser pulse trains. As the pulse separation…
Spin-Orbit-Torque Driven Propagating Spin Waves
Himanshu Fulara, Mohammad Zahedinejad, Roman Khymyn +4
Spin-orbit torque (SOT) can drive sustained spin wave (SW) auto-oscillations in a class of emerging microwave devices known as spin Hall nano-oscillators (SHNOs), which have highly…
Two-dimensional mutual synchronization in spin Hall nano-oscillator arrays
Mohammad Zahedinejad, Ahmad A. Awad, Shreyas Muralidhar +5
Spin Hall nano-oscillators (SHNOs) utilize pure spin currents to drive local regions of magnetic films and nanostructures into auto-oscillating precession. If such regions are plac…
Mutual synchronization of constriction-based spin Hall nano-oscillators in weak in-plane fields
Hamid Mazraati, Shreyas Muralidhar, Seyyed Ruhollah Etesami +6
We study mutual synchronization in double nanoconstriction-based spin Hall nano-oscillators (SHNOs) under weak in-plane fields ( = 30-40 mT) and also investigate…
An Intrinsic Spin Orbit Torque Nano-Oscillator
M. Haidar, A. A. Awad, M. Dvornik +3
Spin torque and spin Hall effect nanooscillators generate high intensity spin wave auto oscillations on the nanoscale enabling novel microwave applications in spintronics, magnonic…
Mapping out the spin-wave modes of constriction-based spin Hall nano-oscillators in weak in-plane fields
Hamid Mazraati, Seyyed Ruhollah Etesami, Seyed Amir Hossein Banuazizi +5
We experimentally study the auto-oscillating spin-wave modes in NiFe/W constriction-based spin Hall nano-oscillators as a function of bias current, in-plane applied field stren…
Time resolved imaging of the non-linear bullet mode within an injection-locked nano-contact spin Hall nano-oscillator
Timothy M Spicer, Paul S Keatley, Mykola Dvornik +8
Injection of a radio frequency (RF) current was used to phase lock the SHNO to the TRSKM. The out of plane magnetization was detected by means of the polar magneto optical Kerr eff…
Spatial Mapping of Torques within a Spin Hall Nano-oscillator
Timothy M Spicer, Paul S Keatley, Thomas H J Loughran +8
Time-resolved scanning Kerr microscopy (TRSKM) was used to study precessional magnetization dynamics induced by a radio frequency (RF) current within a AlO/Py(5 nm)/Pt(6 nm…
Anomalous nonlinearity of the magnonic edge mode
Mykola Dvornik, Johan Åkerman
Nonlinearity of magneto-dynamics is typically described by a single constant, , with positive and negative values indicating repulsion and attraction of magnons, respe…
Damping's effect on the magnetodynamics of spin Hall nano-oscillators
Yuli Yin, Philipp Dürrenfeld, Mykola Dvornik +4
We study the impact of spin wave damping () on the auto-oscillation properties of nano-constriction based spin Hall nano-oscillators (SHNOs). The SHNOs are based on a 5 nm Pt la…
Tunable spin pumping in exchange coupled magnetic trilayers
Masoumeh Fazlali, Martina Ahlberg, Mykola Dvornik +1
Magnetic thin films at ferromagnetic resonance (FMR) leak angular momentum, which may be absorbed by adjacent layers. This phenomenon, known as spin pumping, is manifested by an in…
Adaptively time stepping the stochastic Landau-Lifshitz-Gilbert equation at nonzero temperature: implementation and validation in MuMax3
J. Leliaert, J. Mulkers, J. De Clercq +3
Thermal fluctuations play an increasingly important role in micromagnetic research relevant for various biomedical and other technological applications. Until now, it was deemed ne…
On the origin of magnetization auto-oscillations in constriction-based spin Hall nano-oscillators
Mykola Dvornik, Ahmad A. Awad, Johan Åkerman
We use micromagnetic simulations to map out and compare, the linear and auto-oscillating modes in constriction-based spin Hall nano-oscillators as a function of applied magnetic fi…
Homodyne-detected ferromagnetic resonance of in-plane magnetized nano-contacts: composite spin wave resonances and their excitation mechanism
Masoumeh Fazlali, Mykola Dvornik, Ezio Iacocca +4
This work provides a detailed investigation of the measured in-plane field-swept homodyne-detected ferromagnetic resonance (FMR) spectra of an extended Co/Cu/NiFe pseudo spin valve…
Phenomenological description of the nonlocal magnetization relaxation in magnonics, spintronics, and domain-wall dynamics
Weiwei Wang, Mykola Dvornik, Marc-Antonio Bisotti +8
A phenomenological equation called Landau-Lifshitz-Baryakhtar (LLBar) equation, which could be viewed as the combination of Landau-Lifshitz (LL) equation and an extra "exchange dam…
The design and verification of Mumax3
Arne Vansteenkiste, Jonathan Leliaert, Mykola Dvornik +2
We report on the design, verification and performance of mumax3, an open-source GPU-accelerated micromagnetic simulation program. This software solves the time- and space dependent…
Thermodynamically self-consistent non-stochastic micromagnetic model for the ferromagnetic state
Mykola Dvornik, Arne Vansteenkiste, Bartel Van Waeyenberge
In this work, a self-consistent thermodynamic approach to micromagnetism is presented. The magnetic degrees of freedom are modeled using the Landau-Lifshitz-Baryakhtar theory, that…
Micromagnetic modelling of anisotropic damping in ferromagnet
Mykola Dvornik, Arne Vansteenkiste, Bartel Van Waeyenberge
We report a numerical implementation of the Landau-Lifshitz-Baryakhtar theory, which dictates that the micromagnetic relaxation term obeys the symmetry of the magnetic crystal, i.…