66 citations · 503 across the 28 of their papers we have counts for
28 papers
Effect of Edge Roughness on resistance and switching voltage of Magnetic Tunnel Junctions
Rachit R. Pandey, Sutapa Dutta, Heston A. Mendonca +1
We investigate the impact of edge roughness on the electrical transport properties of magnetic tunnel junctions using non-equilibrium Greens function formalism. We have modeled edg…
Interfacial and bulk spin Hall contributions to field-like spin-orbit torque generated by Iridium
Sutapa Dutta, Arnab Bose, A. A. Tulapurkar +2
We present measurements of spin orbit torques generated by Ir as a function of film thickness in sputtered Ir/CoFeB and Ir/Co samples. We find that Ir provides a damping-like compo…
Transmission based tomography for spin qubits
Amritesh Sharma, Ashwin A. Tulapurkar
We consider a system of static spin qubits embedded in a one-dimensional spin coherent channel and develop a scheme to readout the state of one and two qubits separately. We use un…
Proposal for a graphene based nano-electro-mechanical reference piezoresistor
Abhinaba Sinha, Abhishek Sharma, Pankaj Priyadarshi +2
Motivated by the recent prediction of anisotropy in piezoresistance of ballistic graphene along longitudinal and transverse directions, we investigate the angular gauge factor of g…
Generation of n-qubit W states using Spin Torque
Amritesh Sharma, Ashwin A. Tulapurkar
We examine here a scheme to generate a W state of an n-qubit system with all-to-all pairwise exchange interaction between n qubits. This relies on sharing of superposed excitations…
Investigation of the phase separation property in LaPrCaMnO manganite
Deepak Kumar, Ashwin A. Tulapurkar, C. V. Tomy
We report a comprehensive investigation of La0.2Pr0.4Ca0.4MnO3 to clarify the micrometre scale phase separation phenomenon in the mixed valent manganite (La,Pr,Ca)MnO3. The compoun…
Band-pass Magnetic Tunnel Junction based Magnetoresistive Random Access Memory
Abhishek Sharma, Ashwin Tulapurkar, Bhaskaran Muralidharan
We propose spin transfer torque--magnetoresistive random access memory (STT-MRAM) based on magneto-resistance and spin transfer torque physics of band-pass spin filtering. Utilizin…
Giant enhancement of Piezo-resistance in ballistic graphene due to transverse electric fields
Abhinaba Sinha, Abhishek Sharma, Ashwin Tulapurkar +2
We investigate the longitudinal and transverse piezoresistance effect in suspended graphene in the ballistic regime. Utilizing parametrized tight binding Hamiltonian from ab initio…
Skyrmion Based Spin-Torque Nano-Oscillator
Debasis Das, Bhaskaran Muralidharan, Ashwin Tulapurkar
Using micromagnetic simulation, we investigate the self-sustained oscillation of magnetic skyrmion in a ferromagnetic circular nanodot, driven by spin-torque which is generated fro…
Effect of B-site bismuth doping on magnetic and transport properties of La0.5Ca0.5Mn1-xBixO3 thin films
Himanshu Sharma, Deepak Kumar, Ashwin Tulapurkar +1
The magnetic properties in manganite have been found to be highly sensitive to the doping and structural manipulations. Here, we report the effect of B-site bismuth doping on the m…
Effects of Elastic Dephasing on Scaling of ultra-small Magnetic Tunnel Junctions
Debasis Das, Ashwin Tulapurkar, Bhaskaran Muralidharan
The study of the effects of scaling on magnetic tunnel junction (MTJ) devices has become an important topic in the field of spin-based memory devices. Here, we investigate the effe…
Control of magnetization dynamics by spin Nernst torque
Arnab Bose, Ambika Shankar Shukla, Sutapa Dutta +3
Control of magnetization dynamics is one of the primary goals in spintronics. It has been demonstrated using spin Hall effect i.e charge current to spin current conversion in non-m…
Structure, magnetic and transport properties of epitaxial thin films of equiatomic CoFeMnGe quaternary Heusler alloy
Varun K. Kushwaha, Jyoti Rani, C. V. Tomy +1
Future spintronics requires the realization of thin film of half-metallic ferromagnets having high Curie temperature and 100\% spin polarization at the Fermi level for potential sp…
Band-pass superlattice magnetic tunnel junctions
Abhishek Sharma, Ashwin. A. Tulapurkar, Bhaskaran Muralidharan
Significant scientific and technological progress in the field of spintronics is based on trilayer magnetic tunnel junction devices which principally rely on the physics of single…
Scaling Projections on Spin Transfer Torque Magnetic Tunnel Junctions
Debasis Das, Ashwin Tulapurkar, Bhaskaran Muralidharan
We investigate scaling of technologically relevant magnetic tunnel junction devices in the trilayer and pentalayer configurations by varying the cross-sectional area along the tran…
Direct Observation of the Reciprocity between Spin Current and Phonon Interconversion
Swapnil Bhuktare, Hanuman Singh, Arnab Bose +1
Spin current has emerged as a leading candidate for manipulation of spins in a nano-magnet. We here experimentally show another utility of spin current viz. it can be used for gene…
Integer, fractional and side band injection locking of spintronic feedback nano-oscillator to microwave signal
Hanuman Singh, K. Konishi, S. Bhuktare +8
In this article we demonstrate the injection locking of recently demonstrated spintronic feedback nano oscillator to microwave magnetic fields at integers as well fractional multip…
Possible spin gapless semiconductor type behaviour in CoFeMnSi epitaxial thin films
Varun K. Kushwaha, Jyoti Rani, Ashwin Tulapurkar +1
Spin-gapless semiconductors with their unique band structures have recently attracted much attention due to their interesting transport properties that can be utilized in spintroni…
Sign reversal of field like spin-orbit torque in ultrathin Chromium/Nickel bilayer
Arnab Bose, Hanuman Singh, Swapnil Bhuktare +2
In this work report unconventional sign change of field like spin orbit torque in ultra-thin Chromium(1.5nm-5nm)/Nickel(8nm) bi-layer. We performed standard spin-torque ferromagnet…
Abrupt p-n junction using ionic gating at zero-bias in bilayer graphene
Sameer Grover, Anupama Joshi, Ashwin Tulapurkar +1
Graphene is a promising candidate for optoelectronic applications. In this report, a double gated bilayer graphene FET has been made using a combination of electrostatic and electr…
Observation of Spin Nernst effect in Platinum
Arnab Bose, Swapnil Bhuktare, Hanuman Singh +2
Central focus of spintronics is concentrated on generation of pure spin current and associated spin torque. Pure spin current can be generated by spin Hall effect in heavy metals b…
Resonant spin transfer torque nano-oscillators
Abhishek Sharma, Ashwin A Tulapurkar, Bhaskaran Muralidharan
Spin transfer torque nano-oscillators are potential candidates for replacing the traditional inductor based voltage controlled oscillators in modern communication devices. Typical…
Coherent microwave generation by spintronic feedback oscillator
Dinesh Kumar, K. Konishi, Nikhil Kumar +9
The transfer of spin angular momentum to a nanomagnet from a spin polarized current provides an efficient means of controlling the magnetization direction in nanomagnets. A unique…
Ultra-sensitive nanoscale magnetic field sensors based on resonant spin filtering
Abhishek Sharma, Ashwin Tulapurkar, Bhaskaran Muralidharan
Solid state magnetic field sensors based on magneto-resistance modulation find direct applications in communication devices, specifically in proximity detection, rotational referen…