124 citations · 866 across the 39 of their papers we have counts for
40 papers
Reconfigurable field-free spin Hall nano-oscillators enabled by crystallographic anisotropy in epitaxial Co/Pt
Jong-Guk Choi, Avinash Kumar Chaurasiya, Jaimin Kang +9
Spin Hall nano-oscillators (SHNOs) are nanoscale microwave sources for wireless communication, neuromorphic computing and oscillator-based Ising machines, but conventional devices…
Robust stabilization of high-frequency magnetic droplets in W-CoFeB-MgO nanoconstriction spin Hall nano-oscillators
Hind Prakash, Arunima TM, Roman Khymyn +1
Magnetic droplets are highly nonlinear spin-wave solitons that can be excited in nanoscale spintronic devices with strong perpendicular magnetic anisotropy. Although extensively st…
Spin-Orbital Hall Nano-Oscillators using PtCr/NiFe
Utkarsh Shashank, Akash Kumar, Daegeun Jo +11
The orbital Hall effect provides a promising route for generating angular-momentum currents beyond conventional spin Hall physics. PtCr alloys exhibit unusually large current-induc…
A 2048-spin bulk acoustic wave Ising machine for number partitioning and Sudoku
Venkatesh Vadde, Roman Ovcharov, Victor H. González +3
Optical coherent Ising machines based on time-multiplexing have demonstrated significant progress in terms of connectivity and spin scalability. However, they are constrained by la…
Mutual synchronization of two asymmetric-nano-constriction-based spin-Hall nano-oscillators
Roman V. Ovcharov, Roman S. Khymyn, Akash Kumar +1
We propose an asymmetric-nanoconstriction (ANC) design of spin-Hall nano-oscillators (SHNOs) and investigate mutual synchronization of a pair of such devices using micromagnetic si…
Ultra-large mutually synchronized networks of 10 nm spin Hall nano-oscillators
Nilamani Behera, Avinash Kumar Chaurasiya, Akash Kumar +5
While mutually interacting spin Hall nano-oscillators (SHNOs) hold great promise for wireless communication, neural networks, neuromorphic computing, and Ising machines, the highes…
A frequency tunable low-noise YIG-GGG based oscillator with strong magneto-elastic coupling
Paolo Sgarro, Roman Ovcharov, Roman Khymyn +4
We present a frequency tunable magneto-acoustic oscillator (MAO) operating in low-phase-noise and complex dynamical regimes based on a single composite YIG-GGG resonator. The magne…
Analytical modelling for the frequency behavior of two distinct modes in nano-constriction spin Hall nano-oscillator
H. Ghanatian, M. Rajabali, R. Khymyn +5
Nano-constriction spin-Hall nano-oscillators (NC-SHNOs) have garnered considerable interest due to their potential use as efficient and adjustable nano-sized sources of microwave s…
A numerical model for time-multiplexed Ising machines based on delay-line oscillators
Roman V. Ovcharov, Victor H. González, Artem Litvinenko +2
Ising machines (IM) have recently been proposed as unconventional hardware-based computation accelerators for solving NP-hard problems. In this work, we present a model for a time-…
Optical heterodyne microscopy of operating spin Hall nano-oscillator arrays
A. Alemán, A. A. Awad, S. Muralidhar +5
Optical heterodyne detection is a powerful technique for characterizing a wide range of physical excitations. Here, we use two types of optical heterodyne detection techniques (fun…
Spintronic devices as next-generation computation accelerators
Victor H. González, Artem Litvinenko, Akash Kumar +2
The ever increasing demand for computational power combined with the predicted plateau for the miniaturization of existing silicon-based technologies has made the search for low po…
Spin wave-driven variable-phase mutual synchronization in spin Hall nano-oscillators
Akash Kumar, Avinash kumar Chaurasiya, Victor H. González +4
Spin-orbit torque can drive auto-oscillations of propagating spin wave (PSW) modes in nano-constriction spin Hall nano-oscillators (SHNOs). These modes allow both long-range coupli…
Magnetic droplet solitons
Martina Ahlberg, Sheng Jiang, Roman Khymyn +2
Magnetic droplets are nanoscale, non-topological, dynamical solitons that can be nucleated in different spintronic devices, such as spin torque nano-oscillators (STNOs) and spin Ha…
Mutual synchronization in spin torque and spin Hall nano-oscillators
Akash Kumar, Artem Litvinenko, Nilamani Behera +3
This chapter reviews the state of the art in mutually synchronized spin-torque and spin Hall nano-oscillator (STNO and SHNO) arrays. After briefly introducing the underlying physic…
Antiferromagnetic droplet soliton driven by spin current
Roman V. Ovcharov, Mohammad Hamdi, Boris A. Ivanov +2
We demonstrate that a spin current flowing through a nano-contact into a uniaxial antiferromagnet with first- and second-order anisotropy can excite a self-localized dynamic magnet…
A 50-spin surface acoustic wave Ising machine
Artem Litvinenko, Roman Khymyn, Roman Ovcharov +1
Time-multiplexed Spinwave Ising Machines (SWIMs) have unveiled a route towards miniaturized, low-cost, and low-power solvers of combinatorial optimization problems. While the numbe…
Ultra-low-current-density single-layer magnetic Weyl semimetal spin Hall nano-oscillators
Lakhan Bainsla, Yuya Sakuraba, Avinash Kumar Chaurasiya +7
Topological quantum materials can exhibit unconventional surface states and anomalous transport properties. Still, their applications in spintronic devices are restricted as they r…
Global biasing using a Hardware-based artificial Zeeman term in Spinwave Ising Machines
Victor H. González, Artem Litvinenko, Roman Khymyn +1
A spinwave Ising machine (SWIM) is a newly proposed type of time-multiplexed hardware solver for combinatorial optimization that employs feedback coupling and phase sensitive ampli…
Antiferromagnetic Bloch line driven by spin current as room-temperature analog of a fluxon in a long Josephson junction
R. V. Ovcharov, B. A. Ivanov, J. Åkerman +1
Antiferromagnets (AFMs) are promising materials for future high-frequency field-free spintronic applications. Self-localized spin structures can enhance their capabilities and intr…
Phase noise analysis of mutually synchronized spin Hall nano-oscillators
Artem Litvinenko, Akash Kumar, Mona Rajabali +3
The reduction of phase noise in electronic systems is of utmost importance in modern communication and signal processing applications and requires an understanding of the underlyin…
Robust mutual synchronization in long spin Hall nano-oscillator chains
Akash Kumar, Himanshu Fulara, Roman Khymyn +7
Mutual synchronization of N serially connected spintronic nano-oscillators increases their coherence by a factor and their output power by . Increasing the number of mutua…
Voltage control of frequency, effective damping and threshold current in nano-constriction-based spin Hall nano-oscillators
Victor H. González, Roman Khymyn, Himanshu Fulara +2
Using micromagnetic simulations, we study the interplay between strongly voltage-controlled magnetic anisotropy (VCMA), 200 kJ/m, and gate width, 10--400 nm, in…
A spinwave Ising machine
Artem Litvinenko, Roman Khymyn, Victor H. González +4
We demonstrate a spin-wave-based time-multiplexed Ising Machine (SWIM), implemented using a 5 m thick Yttrium Iron Garnet (YIG) film and off-the-shelf microwave components. The…
Optothermal control of spin Hall nano-oscillators
Shreyas Muralidhar, Afshin Houshang, Ademir Alemán +3
We investigate the impact of localized laser heating on the auto-oscillation properties of a 170 nm wide nano-constriction spin Hall nano-oscillators (SHNO) fabricated from a NiFe/…