We propose a design of THz-frequency signal generator based on layered structure consisting current-driven platinum (Pt) layer and an antiferromagnet (AFM) with easy-plane anisotropy, where the magnetization vectors AFM sublattices are canted inside easy plane by Dzyaloshinskii-Moriya interaction (DMI). The DC electric current flowing in Pt creates, due to spin-Hall effect, perpendicular spin that, being injected layer, tilts DMI-canted out plane, thus exposing them action strong internal...

Abstract We demonstrate analytically and numerically, that a thin film of an antiferromagnetic (AFM) material, having biaxial magnetic anisotropy being driven by external spin-transfer torque signal, can be used for the generation ultra-short “Dirac-delta-like” spikes. The duration generated spikes is several picoseconds typical AFM materials determined inplane effective damping material. output signal consist single spike or discrete group (“bursting”), which depends on repetition (clock)...

It has been shown previously that spin-Hall oscillators based on current-driven bi-layered film structures containing an antiferromagnet (AFM) and a normal metal can generate ultra-short (∼2 ps) “spike-like” pulses in response to external current stimulus of sufficient amplitude, thus operating as ultra-fast artificial “neurons.” Here, we report the results numerical simulations demonstrating single AFM “neuron” perform logic functions or, and, majority, or q-gates, while circuit consisting...

We propose a novel type of terahertz-frequency (TF) signal source based on an antiferromagnetic tunnel junction (ATJ), where the generated ac is extracted through variations tunneling anisotropic magnetoresistance (TAMR) ATJ. The comprises layered structure consisting current-driven platinum (Pt) layer and antiferromagnet (AFM) separated by MgO spacer from additional Pt electrode. A dc electric current flowing in first due to spin Hall effect creates perpendicular that, being injected AFM...

In this review, we consider theoretical and experimental results related to the properties of two-dimensional spin-wave (SW) solitons, so-called SW bullets droplets. Such nonlinear self-localized modes possess very interesting physical properties, could have practical applications in modern future magnonics spintronics. The presented review undeniably proven existence magnetic films confined nanostructures (magnetic nanocontacts), elucidated essential distinctions between one-dimensional...

A spintronic method of ultra-fast broadband microwave spectrum analysis is proposed. It uses a rapidly tuned spin torque nano-oscillator (STNO) and does not require injection locking. This treats an STNO generating signal as element with oscillating resistance. When external applied to this “resistor” for analysis, it mixed the generated by STNO. The resulting voltage contains “sum” “difference” frequencies, latter produces DC component when frequency matches processed using low pass filter...

A method to perform spectrum analysis on low power signals between 0.1 and 10 THz is proposed. It utilizes a nanoscale antiferromagnetic tunnel junction (ATJ) that produces an oscillating tunneling anisotropic magnetoresistance, whose frequency dependent the magnitude of evanescent spin current. first shown ATJ oscillation can be tuned linearly with time. Then, it output highly matching conditions are dimensions dielectric barrier. Spectrum performed by using appropriately designed ATJ,...

We analyze magnetization dynamics in a system of two coupled THz-frequency Josephson-like spin Hall oscillators based on layered structure consisting current-driven platinum layer and an antiferromagnet with easy-plane anisotropy. The signal from the is received through inverse spin-Hall effect we show that it can be used for mutual coupling leading to improvement overall device performance.

Neuromorphic computing is field of electronics which use the similar principals as human brain does. Neurons in nervous system can be presented non-linear oscillators with different regimes operating. In contradiction to traditional computers neuromorphic systems demonstrate better results tasks imaging recognition, synthesis and predictions. this paper we show that antiferromagnetic spin Hall oscillator certain regime behavior one a biological neuron. Form generation pulses, existence...

ВЗАЄМНА ФАЗОВА СИНХРОНIЗАЦIЯ СПIНТРОННИХ МАГНIТНИХ НАНООСЦИЛЯТОРIВ З УРАХУВАННЯМ ТЕХНОЛОГIЧНОГО РОЗКИДУ ЇХ ВЛАСНИХ ПАРАМЕТРIВ

Neuromorphic computing is a field of electronics that uses the similar principles as human brain does. In this paper we show spin Hall oscillator based on an antiferromagnetic dielectric material can operate terahertz-frequency neuron in neuromorphic schemes. Also, such AFM-neurons execute most logical operation.

Brain is a complicated system of coupled neurons, each which can be presented as nonlinear oscillator. Electric pulses spreading from neuron to trough the synapses transfer information signal. This process change coupling between realized via synapses. Neuromorphic computing field electronics, use similar principals human brain does. In this paper we show that spin Hall oscillator based on antiferromagnetic dielectric material operate in neuromorphic schemes. Also, such AFM-neurons execute...

Microwave dynamics of the system two weakly-coupled spin-torque nano-oscillators (STNOs) was analyzed. It shown that synchronization criterion such STNO is a small variation modulus complex order parameter over time. Using this microwave STNOs with random eigen frequencies (Gaussian distribution) and initial phases (rectangular has been studied numerically.

Phase-locking processes in the systems of several weakly-coupled spin-torque nano-oscillators (STNOs) with different eigen parameters are analyzed. It is shown that microwave dynamics such STNO complicated enough and can be fuzzy, while system's synchronization state well described by a small variation modulus complex order parameter over time. Using this approach (two, three five) STNOs studied numerically optimal values amplitude phase global coupling determined.

There are several approaches to the THz-frequency generation, however existing techniques require complex experimental setups and can not be realized even at micron-scale. In contradiction this a thin antiferromagnetic nanostructure covered by metal layer having strong spin-orbital coupling biased DC spin current used as nano-scale source of electromagnetic AC signals with frequencies close eigenfrequencies material (typically 0.1-10 THz). paper we theoretically analyze efficiency such...

Electrodynamic model of a THz-frequency signal source utilizing an antiferromagnetic spin Hall oscillator (SHO), where the magnetization vectors antiferromagnet's (AFM) sublattices are canted inside easy plane, resulting in appearance small net vector, is proposed and analyzed. A bias dc electric current applied to SHO creates that, being injected AFM layer, starts rotate with THz frequency proportional current. This rotation results dipolar radiation that can be directly registered by...

Existing techniques of the THz-frequency signals generation require complex experimental setups and usually can not be realized even at micron scale. In contrast to this recently it was shown that a thin antiferromagnetic (AFM) layer covered by metal having strong spin-orbital coupling biased dc current used as nano-scale source electromagnetic ac with frequencies close eigenfrequencies AFM material (typically 0.1-10 THz). paper we theoretically analyze compare performance such sources based...

Summary form only given. In this paper we consider an alternative mechanism of the THz-frequency signal extraction from AFM-based SHO, where power is collected through AC variation tunneling anisotropic magnetoresistance (TAMR) in AFM tunnel junction (ATJ), electrical switching which has been experimentally observed recent works. We SHO based on IrMn/Pt bilayer structure, driving dc current I <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...

It was recently shown that an antiferromagnetic (AFM) spin Hall oscillators (SHOs) consisting a thin AFM layer covered by current-driven metal having strong spin-orbital coupling can be used as micro- and nano-scale sources of 0.1-3 THz-frequency electromagnetic signals. However the problem ac signal power extraction from SHO is not solved yet, which greatly limits applications such sources. In this paper we theoretically analyze compare performance AFM-based sources, where extracted via...

We demonstrate analytically and numerically, that a thin film of an antiferromagnetic (AFM) material, having biaxial magnetic anisotropy being driven by external spin-transfer torque signal, can be used for the generation ultra-short "Dirac-delta-like" spikes. The duration generated spikes is several picoseconds typical AFM materials determined in-plane effective damping material. output signal consist single spike or discrete group ("bursting"), which depends on repetition (clock) rate,...

A spintronic method of ultra-fast broadband microwave spectrum analysis is proposed. It uses a rapidly tuned spin torque nano-oscillator (STNO), and does not require injection locking. This treats an STNO generating signal as element with oscillating resistance. When external applied to this "resistor" for analysis, it mixed the generated by STNO. The resulting voltage contains "sum" "difference" frequencies, latter produces DC component when frequency matches processed using low pass filter...

Detection of terahertz-frequency (TF) electromagnetic signals is an important task required for many applications TF radiation in medicine, security, communications, technology and science. Here we present a theoretical proposal novel resonance-type signal detector (TFSD) based on antiferromagnetic tunnel junction (ATJ). The four-layer structure Pt/AFM/MgO/Pt consisting two platinum (Pt) layers, layer antiferromagnet (AFM) the MgO tunneling barrier. When external bias dc current flowing...