A5068135852- Magnetic properties of thin films
- Quantum and electron transport phenomena
- Theoretical and Computational Physics
- Multiferroics and related materials
- Advanced Condensed Matter Physics
- Magnetic Properties and Applications
- Nonlinear Dynamics and Pattern Formation
- Physics of Superconductivity and Magnetism
- Advanced Memory and Neural Computing
- Graphene research and applications
- Quantum many-body systems
- Characterization and Applications of Magnetic Nanoparticles
- Photonic and Optical Devices
- Semiconductor Quantum Structures and Devices
- ZnO doping and properties
- Photonic Crystals and Applications
- Odor and Emission Control Technologies
- MXene and MAX Phase Materials
- Heusler alloys: electronic and magnetic properties
- Metamaterials and Metasurfaces Applications
- Semiconductor materials and interfaces
- Metallic Glasses and Amorphous Alloys
- Topological Materials and Phenomena
- Antimicrobial agents and applications
- Random lasers and scattering media
University of Gothenburg
2023-2025
Institute of Chartered Financial Analysts of India University, Jaipur
2025
Indian Institute of Technology BHU
2024
Banaras Hindu University
2024
People’s University
2023
S.N. Bose National Centre for Basic Sciences
2015-2022
Asian Paints (India)
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,...
In the growing field of $m\phantom{\rule{0}{0ex}}a\phantom{\rule{0}{0ex}}g\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}o\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}c\phantom{\rule{0}{0ex}}s$, spin waves (magnons) are manipulated as information carriers, particularly for data processing. Thus controlling propagation is paramount interest here. This investigation considers a ferromagnetic bilayer with dipolar coupling potential nonreciprocal magnonic device, in...
Abstract Interfacial Dzyaloshinskii-Moriya interaction (IDMI) is important for its roles in stabilizing the skyrmionic lattice as well soliton-like domain wall motion leading towards new generation spintronic devices. However, achievement and detection of IDMI often hindered by various spurious effects. Here, we demonstrate occurrence originating primarily from W/CoFeB interface technologically W/CoFeB/SiO 2 heterostructures using Brillouin light scattering technique. Due to presence IDMI,...
On-demand magnonic nanochannels are achieved by modulation of voltage-controlled magnetic anisotropy in CoFeB/MgO heterostructure.
Abstract Spin–orbit torque can drive auto-oscillations of propagating spin-wave modes in nano-constriction spin Hall nano-oscillators. These facilitate both long-range coupling and the possibility controlling their phase, which is a crucial aspect for device application. Here, we demonstrate variable-phase between two nano-oscillators mutual synchronization driven by waves. Using electrical measurements phase-resolved micro-focused Brillouin light scattering microscopy, show that phase be...
While mutually interacting spin Hall nano-oscillators (SHNOs) hold great promise for wireless communication, neural networks, neuromorphic computing, and Ising machines, the highest number of synchronized SHNOs remains limited to $N$ = 64. Using ultra-narrow 10 20-nm nano-constrictions in W-Ta/CoFeB/MgO trilayers, we demonstrate SHNO networks up 105,000. The microwave power quality factor scale as with new record values 9 nW $1.04 \times 10^6$, respectively. An unexpectedly strong array size...
The interfacial Dzyaloshinskii-Moriya interaction (iDMI) plays a key role in stabilizing magnetic skyrmions, tiny topological hedgehogs that could provide basis for spintronics. Investigating the iDMI as function of layer thicknesses technologically important heterostructures, authors observe constant $D$ varies linearly with inverse Co-Fe-B thickness, demonstrating its purely origin, whereas relationship to Ta thickness is complex, and nearly independent above threshold value. Boron...
Graphene/ferromagnet interface promises a plethora of new science and technology. The interfacial Dzyaloshinskii Moriya interaction (iDMI) is essential for stabilizing chiral spin textures, which are important future spintronic devices. Here, we report direct observation iDMI in graphene/Ni80Fe20/Ta heterostructure from non-reciprocity spin-wave dispersion using Brillouin light scattering (BLS) technique. Linear scaling with the inverse Ni80Fe20 thicknesses suggests primarily origin iDMI....
Abstract Spin-orbit torque can drive auto-oscillations of propagating spin wave (PSW) modes in nano-constriction Hall nano-oscillators (SHNOs). These allow both long-range coupling and the potential controlling its phase—critical aspect for nano-magnonics, logic, Ising machines. Here, we demonstrate PSW-driven variable-phase between two SHNOs study how their separation PSW vector impact mutual synchronization. In addition to ordinary in-phase synchronization, observe, using electrical...
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...
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...
Magnetization dynamics in Ni80Fe20 (Py) diatomic nanodots (nanodots of the same thickness but with large and small diameters that are closely placed to each other so as act a basis structure) embedded 2D arrays have been investigated by Brillouin light scattering technique. A distinct variation resonant mode characteristics for different in-plane bias magnetic field applied along two orientations lattice has observed. Micromagnetic simulations reproduced observed dynamical behaviour revealed...
Nano-constriction based spin Hall nano-oscillators (SHNOs) are at the forefront of spintronics research for emerging technological applications, such as oscillator-based neuromorphic computing and Ising Machines. However, their miniaturization to sub-50 nm width regime results in poor scaling threshold current. Here, it shows that current shunting through Si substrate is origin this problem studies how different seed layers can mitigate it. It finds an ultra-thin Al
To promote better biological response and osseointegration continuous research is going on to modify the titanium (Ti) implant surface for successful treatment modality.
Tunability of spin waves in [Co/Ni80Fe20] r multilayer films by varying the number bilayer repetition (r) is investigated using Brillouin light scattering (BLS) spectroscopy. Conventional magnetometry shows a monotonic increase in-plane anisotropy with r. BLS spectra show distinct modes, which were found to be Damon–Eshbach and perpendicular standing wave modes confined several bilayers different mode numbers macrospin modelling. The extracted values magnetic parameters from measurements...
We study the magnetic inhomogeneity originating from interfacial roughness in ultrathin Ta(N)|CoFeB|MgO heterostructures using Brillouin light scattering and observed a significantly reduced damping by N-doping Ta underlayer.
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...
Spin-orbit torque can drive auto-oscillations of propagating spin wave (PSW) modes in nano-constriction Hall nano-oscillators (SHNOs). These allow both long-range coupling and the potential controlling its phase -- critical aspect for nano-magnonics, logic, Ising machines. Here, we demonstrate PSW-driven variable-phase between two SHNOs study how their separation PSW vector impact mutual synchronization. In addition to ordinary in-phase synchronization, observe, using electrical measurements...