A5070372723- Magnetic properties of thin films
- Advanced Memory and Neural Computing
- Quantum and electron transport phenomena
- Ferroelectric and Negative Capacitance Devices
- Characterization and Applications of Magnetic Nanoparticles
- Magnetic Properties and Applications
- Magneto-Optical Properties and Applications
- Multiferroics and related materials
- Theoretical and Computational Physics
- ZnO doping and properties
- Physics of Superconductivity and Magnetism
- Advanced Research in Systems and Signal Processing
- MXene and MAX Phase Materials
- Heusler alloys: electronic and magnetic properties
- Electronic and Structural Properties of Oxides
- Plasmonic and Surface Plasmon Research
- 2D Materials and Applications
- Semiconductor materials and devices
Centre National de la Recherche Scientifique
2021-2024
CEA Grenoble
2021-2024
Spintronique et Technologie des Composants
2021-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2021-2024
Université Grenoble Alpes
2021-2024
Indian Institute of Technology Gandhinagar
2024
Institut polytechnique de Grenoble
2021-2024
Indian Institute of Technology Delhi
2016-2021
University of Gothenburg
2016
KTH Royal Institute of Technology
2016
Magnetic skyrmions are topological spin-textures having immense potential for energy efficient spintronic devices. Here, we report the observation of stable in unpatterned Ta/Co2FeAl(CFA)/MgO thin film heterostructures at room temperature remnant state employing magnetic force microscopy. It is shown that these consisting ultrathin ferromagnetic CFA Heusler alloy result from strong interfacial Dzyaloshinskii-Moriya interaction (i-DMI) as evidenced by Brillouin light scattering measurements,...
Magnetic skyrmions are deemed to be the forerunners of novel spintronic memory and logic devices. While their observation current-driven motion at room temperature have been demonstrated, certain issues regarding nucleation, stability, pinning, skyrmion Hall effect still need overcome realize functional Here, we demonstrate that focused He+-ion-irradiation can used create guide in racetracks. We show reduction perpendicular magnetic anisotropy Dzyaloshinskii–Moriya interaction track defined...
Magnetic skyrmions are topological magnetic textures that hold great promise as nanoscale bits of information in memory and logic devices. Although room-temperature ferromagnetic their current-induced manipulation have been demonstrated, velocity has limited to about 100 meters per second. In addition, dynamics perturbed by the skyrmion Hall effect, a motion transverse current direction caused charge. Here, we show compensated synthetic antiferromagnets can be moved along at velocities up...
Magnetic skyrmions are topological spin textures that hold great promise as nanoscale information carriers in non-volatile memory and logic devices. While room-temperature magnetic their current-induced manipulation were recently demonstrated, the stray field resulting from finite magnetization well charge limit minimum size reliable motion tracks. Antiferromagnetic (AF) allow these limitations to be lifted owing vanishing net zero charge, promising room-temperature, ultrasmall skyrmions,...
Magnetic skyrmions are topological spin textures which envisioned as nanometer scale information carriers in magnetic memory and logic devices. The recent demonstrations of room temperature their current induced manipulation ultrathin films were first steps toward the realization such However, important challenges remain regarding electrical detection low-power nucleation skyrmions, required for read write operations. Here, we demonstrate, using operando microscopy experiments, a single...
Magnetic skyrmions are promising candidates as elementary nanoscale bits in logic-in-memory devices, intrinsically merging high-density memory and computing capabilities. Here we exploit the dynamics of interacting with anisotropy energy barriers patterned by ion irradiation to design programmable logic gates. Using micromagnetic simulations experimental parameters, show that a fine tuning barrier height width allows selective tunneling between parallel nanotracks triggered skyrmion-skyrmion...
We demonstrate enhanced radio frequency (RF) detection sensitivity in a magnetic tunnel junction based spin torque oscillator (STO) using parametric synchronization. The synchronization is observed above the auto-oscillation threshold of STO and enhances RF at 2f0, where f0 frequency. maximum for 2f0≃9 GHz 16 mV/mW, while f0≃4.5 without 12 mV/mW. Macrospin simulations corroborate experimental results.
A skyrmion can be stabilized in a nanodisc geometry ferromagnetic material with Dzyaloshinskii-Moriya (DM) interaction. We apply spin torque uniform space and time observe numerically that the is set steady rotational motion around point off center. give theoretical description of emerging auto-oscillation dynamics based on coupling to breathing mode associated oscillations in-plane magnetization. The analysis shows achievement auto-oscillations this simple set-up due chiral symmetry...
Abstract An important property of spin-torque nano-oscillators (STNOs) is their ability to produce a frequency modulated (FM) signal, which very critical for communication applications. We here demonstrate novel single sideband (SSB) modulation phenomenon using magnetic tunnel junction (MTJ)-based STNO, saves transmission bandwidth and in principle should minimize attenuation wireless communication. Experimentally, lower sidebands (LSSBs) have been successfully demonstrated over wide range...
We report on a time-domain study of parametric synchronization in magnetic tunnel junction based spin torque nano-oscillator (STNO). Time-domain measurements the instantaneous frequency ($f_{i}$) parametrically synchronized STNO show random short-term unlocking signal for low injected radio-frequency (RF) power, which cannot be revealed time-averaged domain measurements. Macrospin simulations reproduce experimental results and reveal that during is driven by thermal fluctuations. using high...
We find numerically skyrmionic textures with skyrmion number $Q=0$ in ferromagnets the Dzyaloshinskii-Moriya interaction, perpendicular anisotropy, and magnetostatic field. These have a part an antiskyrmion part, they may be called chiral droplets. They are stable infinite film as well disk-shaped magnetic elements. Droplets found films for values of parameters close to transition from ferromagnetic spiral phase. Under spin-transfer torque, move direction spin flow behave solitary waves...
Magnetic skyrmions are promising candidates for logic-in-memory applications, intrinsically merging high density non-volatile data storage with computing capabilities, owing to their nanoscale size, fast motion, and mutual repulsions. However, concepts proposed so far suffer from reliability issues as well inefficient conversion of magnetic information electrical signals. In this paper, we propose a device which exploits skyrmion confinement channeling using anisotropy energy barriers...
We demonstrate an energy efficient method of radio frequency (RF) detection for two bands ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${S}+{C}$ </tex-math></inline-formula> and notation="LaTeX">${X}-$ band) using a magnetic tunnel junction-based nanopillar. For carefully chosen geometry, modes are simultaneously excited with the opposite sign rectification voltage, enabling microwave band...
We propose a method for simultaneous enhancement of the Radio Frequency (RF) detection sensitivity and frequency Magnetic Tunnel Junction (MTJ) by utilizing voltage controlled magnetic anisotropy (VCMA) technique parametric synchronization. show that presence VCMA enhances coupling strength synchronization ∼40 times, giving very high order 105 mV/mW. discuss detailed field, bias, external RF power, temperature dependence phenomenon optimization MTJ based detectors. The results will be useful...
Dynamics of the decay a single skyrmion confined in ferromagnetic nanodisk presence stochastic thermal noise are studied using micromagnetic simulations. By analyzing time‐varying oscillations in‐plane and out‐of‐plane magnetization under influence field, two eigenmodes with frequencies differing by an order magnitude is identified—a low‐frequency mode associated gyration core high‐frequency breathing radius. It shown that fluctuations not only affect topological charge but also helicity...
The modulation bandwidth ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${f}_{{BW}}$ </tex-math></inline-formula> ) is a critical figure-of-merit for wireless communication applications of spin torque nano-oscillators (STNOs) as it determines the maximum data rate. Although both theory and previous experiments have shown that in STNOs governed by amplitude relaxation frequency...
Abstract We numerically investigate the ultrafast nucleation of antiferromagnetic (AFM) skyrmion using in-plane spin-polarized current and present its key advantages over out-of-plane current. show that threshold density required for creation AFM is almost an order magnitude lower The time found to be $$12-7$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>12</mml:mn> <mml:mo>-</mml:mo> <mml:mn>7</mml:mn> </mml:mrow> </mml:math> ps corresponding 1– $$3\times...
We report on a macrospin simulation study of field angle dependent single sideband (SSB) generation in spin-torque nano- oscillator with free layer magnetized the film plane. show that during analog modulation spin torque nano-oscillator depends strongly in-plane angle. validate our results by using non-linear frequency and amplitude theory which describes angular dependence taking into account nonlinear sensitivity coefficients. propose an optimum range for SSB generation.
Magnetic skyrmions are topological spin textures which envisioned as nanometre scale information carriers in magnetic memory and logic devices. The recent demonstration of room temperature stabilization their current induced manipulation industry compatible ultrathin films were first steps towards the realisation such However, important challenges remain regarding electrical detection low-power nucleation skyrmions, required for read write operations. Here, we demonstrate, using operando...