Zobrazeno 1 - 10
of 68
pro vyhledávání: '"Pufall, M. R."'
Reinforcement learning algorithms are used in a wide range of applications, from gaming and robotics to autonomous vehicles. In this paper we describe a set of reinforcement learning-based local weight update rules and their implementation in superco
Externí odkaz:
http://arxiv.org/abs/2404.18774
Publikováno v:
Phys. Rev. Applied 15, 054021 (2021)
We report on the strong coupling between a metallic ferromagnetic Fe75Co25 thin film patterned element and a range of superconducting Nb half-wavelength co-planar waveguide (CPW) resonators. By varying the volume of the ferromagnet we demonstrate tha
Externí odkaz:
http://arxiv.org/abs/2102.01129
Stochastic single flux quantum neuromorphic computing using magnetically tunable Josephson junctions
Autor:
Russek, S. E., Donnelly, C. A., Schneider, M. L., Baek, B., Pufall, M. R., Rippard, W. H., Hopkins, P. F., Dresselhaus, P. D., Benz, S. P.
Single flux quantum (SFQ) circuits form a natural neuromorphic technology with SFQ pulses and superconducting transmission lines simulating action potentials and axons, respectively. Here we present a new component, magnetic Josephson junctions, that
Externí odkaz:
http://arxiv.org/abs/1612.09292
We measure the power spectral density of frequency fluctuations in nanocontact spin torque oscillators over time scales up to 50 ms. We use a mixer to convert oscillator signals ranging from 10 GHz to 40 GHz into a band near 70 MHz before digitizing
Externí odkaz:
http://arxiv.org/abs/1005.5372
We measure oscillator phase from the zero crossings of the voltage vs. time waveform of a spin torque nanocontact oscillating in a vortex mode. The power spectrum of the phase noise varies with Fourier frequency $f$ as $1/f^2$, consistent with freque
Externí odkaz:
http://arxiv.org/abs/0904.1214
We have measured spin-transfer-driven, large amplitude, current hysteretic, low frequency (< 500 MHz), narrowband oscillations in nanocontacts made to spin valve structures. The oscillations occur in zero field, persist up to 5 mT for in plane applie
Externí odkaz:
http://arxiv.org/abs/cond-mat/0702416
Publikováno v:
Phys Rev Lett 95, 267206 (2005)
A nonlinear model of spin wave excitation using a point contact in a thin ferromagnetic film is introduced. Large-amplitude magnetic solitary waves are computed, which help explain recent spin-torque experiments. Numerical simulations of the fully no
Externí odkaz:
http://arxiv.org/abs/cond-mat/0509265
Spin-polarized dc electric current flowing into a magnetic layer can induce precession of the magnetization at a frequency that depends on current. We show that addition of an ac current to this dc bias current results in a frequency modulated (FM) s
Externí odkaz:
http://arxiv.org/abs/cond-mat/0411114
We have measured microwave frequency, current-driven magnetization dynamics in point contacts made to Co90Fe10/Cu/ Ni80Fe20 spin valves as a function of applied field strength and angle relative to the film plane. As the field direction is varied fro
Externí odkaz:
http://arxiv.org/abs/cond-mat/0405558
We have directly measured coherent high-frequency magnetization dynamics in ferromagnet films induced by a spin-polarized DC current. The precession frequency can be tuned over a range of several gigahertz, by varying the applied current. The frequen
Externí odkaz:
http://arxiv.org/abs/cond-mat/0309042