A5006963126- Magnetic properties of thin films
- Multiferroics and related materials
- Quantum and electron transport phenomena
- Advanced Condensed Matter Physics
- Graphene research and applications
- Theoretical and Computational Physics
- Topological Materials and Phenomena
- 2D Materials and Applications
- Magneto-Optical Properties and Applications
- Quantum-Dot Cellular Automata
- Metamaterials and Metasurfaces Applications
- Neural Networks and Reservoir Computing
- Quantum many-body systems
- Advanced Memory and Neural Computing
- Magnetic Properties and Synthesis of Ferrites
- Plasmonic and Surface Plasmon Research
- Advanced Materials and Mechanics
- Advanced Materials Characterization Techniques
- Characterization and Applications of Magnetic Nanoparticles
- Semiconductor materials and interfaces
- Phase-change materials and chalcogenides
- ZnO doping and properties
- Copper Interconnects and Reliability
- Metal and Thin Film Mechanics
- Molecular Communication and Nanonetworks
S.N. Bose National Centre for Basic Sciences
2020-2024
Virginia Commonwealth University
2024
Harnessing high-frequency spin dynamics in three-dimensional (3D) nanostructures may lead to paradigm-shifting, next generation devices including high density spintronics and neuromorphic systems. Despite remarkable progress fabrication, the measurement interpretation of complex 3D structures remain exceptionally challenging. Here we take a first step measure coherent waves within artificial ice (ASI) structure using Brillouin light scattering. The 3D-ASI was fabricated by combination...
On-demand magnonic nanochannels are achieved by modulation of voltage-controlled magnetic anisotropy in CoFeB/MgO heterostructure.
We report microwave-power-driven strong magnon-magnon coupling in $\mathrm{N}{\mathrm{i}}_{80}\mathrm{F}{\mathrm{e}}_{20}$ nanocross array with large anticrossing gaps up to 1.03 GHz. also observe microwave-driven nonlinear shift ferromagnetic resonance (FMR) frequency its sign dependent on the strength of bias magnetic field. A drastic enhancement inter-nanocross-dynamic dipolar interaction results anticrossing, while variation internal spin texture leads FMR shift. The tunable and...
Two-dimensional transition metal dichalcogenides (TMDs) have immense potential for spintronics applications. Here, we report atomic layer thickness dependence in ${\mathrm{WS}}_{2}/{\mathrm{Co}}_{3}\mathrm{FeB}$ heterostructures. The is predicted by density functional theory and demonstrated experimentally the of Dzyaloshinskii-Moriya interaction (DMI). Notably, observed DMI ${\mathrm{WS}}_{2}$ to be larger than that heavy metals such as W Ta, which important stabilize chiral structures....
Traditional electronics rely on charge currents for controlling and transmitting information, resulting in energy dissipation due to electron scattering. Over the last decade, magnons, quanta of spin waves, have emerged as a promising alternative. This perspective article provides brief review experimental theoretical studies quantum hybrid magnonics from interaction magnons with other quasiparticles GHz frequency range, offering insights into development functional magnonic devices. In this...
Topological magnonics has attracted intense interest for application in energy efficient computational devices. Here, we show reconfigurable magnonic band structure and gap by a bias-field controlled spin texture chains of connected ${\mathrm{Ni}}_{80}{\mathrm{Fe}}_{20}$ submicron dots. Particularly an identical field value, achieve both ``$S$'' shifted-core vortex states based on magnetic history leading to drastic change structure. A first-order phase transition from the saturation state...
We report on a direct measurement of sizable interfacial Dzyaloshinskii-Moriya interaction (iDMI) at the interface two-dimensional transition metal dichalcogenide (2D-TMD), MoS$_{\rm 2}$ and Ni$_{80}$Fe$_{20}$ (Py) using Brillouin light scattering spectroscopy. A clear asymmetry in spin-wave dispersion is measured 2}$/Py/Ta, while no such detected reference Py/Ta system. linear scaling DMI constant with inverse Py thickness indicates origin observed DMI. further observe an enhancement three...
When magnets are fashioned into nanoscale elements, they exhibit a wide variety of phenomena replete with rich physics and the lure tantalizing applications. In this topical review, we discuss some these phenomena, especially those that have come to light recently, highlight their potential We emphasize what drives phenomenon, undergirds dynamics system exhibits how can be manipulated, specific features harnessed for technological advances. For sake balance, point out both advantages...
The existence of one-dimensional strings local excitations represents an intriguing aspect the properties strongly correlated topological quantum matter. Here, we study impact these string phases (1D SPs) on magnetization dynamics in Santa Fe ice lattice using micromagnetic simulations. presence 1D SPs results creation parallel configurational anisotropic doublet or triplet pairs spin wave (SW) modes, attributed to distinct stray field distributions. These modes induce formation anticrossing...
Artificial spin ice systems have seen burgeoning interest due to their intriguing physics and potential applications in reprogrammable memory, logic, magnonics. Integration of artificial with functional magnonics is a relatively recent research direction, host promising results. As the field progresses, direct in-depth comparisons distinct are crucial advancing field. While studies investigated effects different lattice geometries, little comparison exists between comprising continuously...
In Part I of this topical review, we discussed dynamical phenomena in nanomagnets, focusing primarily on magnetization reversal. part, address mostly wave-like with emphasis spin waves myriad nanomagnetic systems and methods controlling dynamics nanomagnet arrays. We conclude a discussion some interesting spintronic that undergird the rich physics exhibited by assemblies.
The quest for quantum phenomena in unconventional materials has led to the development of myriad unique systems. Because their unusual atomic-scale interface properties and controllability, graphene/ferromagnet heterostructures have emerged as a strong contender next-generation spintronics. Further demands superior correlation between different microscopic mechanisms involved. Herein, we demonstrate interfacial Dzyaloshinskii–Moriya interaction (iDMI) single-layer graphene/CoFeB/SiO2 from...
Reconfigurable magnonics have attracted intense interest due to their myriad advantages including energy efficiency, easy tunability and miniaturization of on-chip data communication processing devices. Here, we demonstrate efficient reconfigurability spin-wave (SW) dynamics as well SW avoided crossing by varying bias magnetic field orientation in triangular shaped Ni80Fe20nanodot arrays. In particular, for a range in-plane angles field, achieve mutual coherence between two lower frequency...
Femtosecond laser-induced ultrafast magnetization dynamics are all-optically probed for different remanent magnetic domain states of a [Co/Pt]22 multilayer sample, thus revealing the tunability direct transport spin angular momentum across walls. A variety configurations (domain wall origami) at remanence achieved by applying field histories investigated time-resolved magneto-optical Kerr effect magnetometry to probe dynamics. Depending on underlying landscape, spin-transport-driven show...
Spin-Orbit Torque (SOT) Magnetic Random-Access Memories (MRAM) have shown promising results towards the realization of fast, non-volatile memory systems. Oxidation heavy-metal (HM) layer SOT-MRAM has been proposed as a method to increase its energy efficiency. But are widely divergent due difficulty in controlling HM oxidation because low enthalpy formation. Here, we reconcile these differences by performing gradual procedure, which allows correlating chemical structure physical properties...
The spin Hall effect is a celebrated phenomenon in spintronics and magnetism that has found numerous applications digital electronics (memory logic), but very few analog electronics. Practically, the only application widespread use nano-oscillator (SHNO) delivers high frequency alternating current or voltage to load. Here, we report its analogue - nano-antenna (SHNA) radiates electromagnetic wave (alternating electric/magnetic fields) into surrounding medium. It can also radiate an acoustic...
<title>Abstract</title> A spin Hall nano-oscillator (SHNO) is a well-known device that delivers high frequency alternating current or voltage to load1 and has found many technological applications. Here, we report its analogue – nano-antenna (SHNA) radiates electromagnetic wave (alternating electric/magnetic fields) into the surrounding medium. It can also radiate an acoustic in underlying substrate if nanomagnets are made of magnetostrictive material, which makes it dual...