A5046758034- Magnetic properties of thin films
- Quantum and electron transport phenomena
- Advanced Memory and Neural Computing
- Magnetic Field Sensors Techniques
- Neural Networks and Reservoir Computing
- Physics of Superconductivity and Magnetism
- ZnO doping and properties
- Semiconductor materials and devices
- Non-Destructive Testing Techniques
- Mechanical and Optical Resonators
- Characterization and Applications of Magnetic Nanoparticles
- Ferroelectric and Negative Capacitance Devices
- Magnetic Properties and Applications
- Magneto-Optical Properties and Applications
- Atomic and Subatomic Physics Research
- Neural Networks and Applications
- Microfluidic and Bio-sensing Technologies
- Education Pedagogy and Practices
- Sensor Technology and Measurement Systems
- Semiconductor Quantum Structures and Devices
- Nuclear Materials and Properties
- Wireless Signal Modulation Classification
- Dental materials and restorations
- Advanced biosensing and bioanalysis techniques
- Nuclear reactor physics and engineering
International Iberian Nanotechnology Laboratory
2016-2025
Universidade Nova de Lisboa
2024-2025
Universidade Federal de Viçosa
2022-2023
Consejería de Educación y Empleo
2023
Hospital Garcia de Orta
2022
Ministry of Education
2022
San Antonio College
2022
KTH Royal Institute of Technology
2019
Korea National University of Education
2019
University of Gothenburg
2019
Magnetoresistive sensors using spin valves and magnetic tunnel junctions are reviewed, considering applications as readers in hard disk drives, well where the ultimate field detection limits required (from nT down to pT). The sensor noise level quasi-DC or high-frequency is described, leading design considerations concerning biomedical read head applications. Magnetic junction based MgO barriers appear best candidates for ultra-low (pT) detection, either regime,
This paper describes how magnetoresistive materials can be optimized and integrated in magnetic field sensor devices. Giant (GMR) tunnel (TMR) provide advantageous solutions for a wide range of applications, which some are described here. Considerations on sensitivities, intrinsic noise mechanisms, biasing, integration schemes presented.
Unbiased sources of true randomness are crucial for the next generation encryption applications and stochastic computing in various fields, yet achieving such without bias has remained technically challenging. This study introduces an innovative hardware approach, utilizing intrinsic balance phase noise a spintronic nano-oscillator synchronized at twice its natural frequency to overcome random bitstream room temperature. The method generates truly bitstreams with efficiency reliability that...
Low frequency noise and small output voltage are the strongest limitations to use of magnetic tunnel junctions (MTJs) for sensor applications, replacing giant magnetoresistance (GMR) anisotropic sensors. In this paper, we explore possibility using arrays with a large number MTJs connected in parallel/series overcome these limitations. MTJ’s more than 3×103 junction elements different configurations have been fabricated. detectivity measured compared an analytical model, detectivities about...
Short wavelength exchange-dominated propagating spin waves will enable magnonic devices to operate at higher frequencies and data transmission rates. While giant magnetoresistance (GMR)-based magnetic nanocontacts are efficient injectors of waves, the generated wavelengths 2.6 times nano-contact diameter, electrical signal strength remains too weak for applications. Here we demonstrate nano-contact-based wave generation in tunnel junctions observe large-frequency steps consistent with...
Abstract Spin-transfer torque nano-oscillators (STNO) are important candidates for several applications based on ultra-tunable microwave generation and detection. The dynamics in these STNOs induced by spin currents that typically generated either polarization an adjacent ferromagnetic layer or through the Hall effect. In this paper, a 3-terminal STNO magnetic tunnel junction is excited both of injection mechanisms. combination two mechanisms excites free into dynamic regimes beyond what can...
We demonstrate that a spin-torque nano-oscillator (STNO) rapidly sweep-tuned by bias voltage can be used to perform an ultrafast time-resolved spectral analysis of frequency-manipulated microwave signals. The critical reduction in the time comes from naturally small-time constants nanosized STNO (1–100 ns). demonstration is performed on vortex-state generating frequency range around 300 MHz, when down-conversion and matched filtering for signal processing. It shown this STNO-based spectrum...
Abstract Neuromorphic computing is a promising strategy to overcome fundamental limitations, such as enormous power consumption, by massive parallel data processing, similar the brain. Here we demonstrate proof-of-principle implementation of weighted spin torque nano-oscillator (WSTNO) programmable building block for next-generation neuromorphic systems (NCS). The WSTNO spintronic circuit composed two devices made magnetic tunnel junctions (MTJs): non-volatile memories acting synapses and...
Abstract The emergence of exceptional points (EPs) in the parameter space a non-hermitian (2D) eigenvalue problem has long been interest mathematical physics, however, only last decade entered scope experiments. In coupled systems, EPs give rise to unique physical phenomena, and enable development highly sensitive sensors. Here, we demonstrate at room temperature spintronic nanoscale oscillators exploit system’s non-hermiticity. We observe amplitude death self-oscillations other complex...
Spin dependent tunnel junctions showing magnetoresistance (TMR) values of 39/spl sim/41% were fabricated using Ion Beam Deposition (IBD). Both the electrodes and aluminum layer deposition done by IBD. The oxidation was performed assist gun with an oxygen beam (+30 V acceleration voltage applied on grids) mixed O/sub 2//Ar plasma. monitored in real time a residual gas analyzer (RGA). junction area is defined lithography, down to 3/spl times/2 /spl mu/m/sup 2/. As-deposited 15 Aring/ Al showed...
The magnetic field detection limit of spin valve sensors in the thermal noise regime is improved from 1.3 nT/Hz <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1/2</sup> to 0.064 by incorporating a Co <sub xmlns:xlink="http://www.w3.org/1999/xlink">93</sub> Zr xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Nb xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> soft flux guide concentrator structure. Linear were processed down 20times2 mum...
Large area MTJs with linear response and very larger sensitivities are needed to fulfill the requirements for detection of pT/Hz <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex Notation="TeX">$^{0.5}$</tex></formula> magnetic fields at low frequency room temperature. MTJ stacks soft-pinned sensing layers have been developed stack was optimized, providing a tunable soft-pinning field over large range values....
Abstract Reported steady-state microwave emission in magnetic tunnel junction (MTJ)-based spin transfer torque nano-oscillators (STNOs) relies mostly on very thin insulating barriers [resulting a resistance × area product ( R A ) of ~1 Ωμm 2 ] that can sustain large current densities and thus trigger orbit dynamics. Apart from the low requirement, role barrier dynamics has so far been largely overlooked, comparison to configuration STNOs. In this report, STNOs with an in-plane magnetized...
We developed a highly sensitive magnetic tunnel junction (MTJ) based field sensor device with sensitivity of 1.29 Ω/μT. For this, more than 1000 microstructured linear MgO MTJ pillars were fabricated and connected in series. By current biasing the under small AC external fields (μ0HAC), large output voltage proportional to μ0HAC is induced. Carrying out noise spectral density measurements at such conditions, we demonstrate that our able detect down 115 pT/Hz0.5 frequencies fAC &lt; 200...
The present white paper focuses on the system requirements of TERRANOVA. Initially details key use cases for TERRANOVA technology and presents description network architecture. In more detail, are classified into two categories, namely backhaul & fronthaul access small cell backhaul. first category refers to fibre extender, point-to-point redundancy applications, whereas latter is designed support backup connection medium-sized enterprises (SMEs), internet things (IoT) dense environments,...
The tracking of eye gesture movements using wearable technologies can undoubtedly improve quality life for people with mobility and physical impairments by spintronic sensors based on the tunnel magnetoresistance (TMR) effect in a human-machine interface. Our design involves integrating three TMR an eyeglass frame detecting relative movement between sensor tiny magnets embedded in-house fabricated contact lens. Using sensitivity 11 mV/V/Oe ten <1 mm3 within lens, system was implemented...
In this paper, we investigate the granularity in free layer of magnetic tunnel junctions (MTJ) and its potential to function as a reservoir for computing where grains act oscillatory neurons while device is vortex state. The input applied form field which can pin core into different oscillation frequency MTJ resistance vary across non-linear fashion making them great candidates be served reservoir's outputs classification objectives. Hence, propose an experimentally validated area-efficient...
Neuromorphic computing, inspired by the brain's parallel and energy-efficient processing, offers a transformative approach to artificial intelligence. In this study, we fabricated optimized spin-transfer torque nano-oscillators (STNOs) investigated their dynamic behaviors using hybrid excitation scheme combining AC laser illumination DC bias currents. Laser-induced thermal gradients generate pulsed thermoelectric voltages ($V_{\text{AC}}$) via Tunnel Magneto-Seebeck (TMS) effect, while...