Dheeraj Kumar
S.N. Bose National Centre for Basic Sciences
33 Papers
202 Citations
Dheeraj Kumar is an academic researcher from S.N. Bose National Centre for Basic Sciences. The author has contributed to research in topics: Spin wave & Magnetization dynamics. The author has an hindex of 19, co-authored 33 publications. Previous affiliations of Dheeraj Kumar include Bose Corporation & National University of Singapore.
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Papers
A reconfigurable waveguide for energy-efficient transmission and local manipulation of information in a nanomagnetic device.
TL;DR: A reconfigurable waveguide design is proposed that can transmit and locally manipulate spin waves without the need for any external bias field once initialized, and a binary gating of the spin-wave signal is experimentally shown by controlled switching of the magnetization, locally, in the waveguide.
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Numerical calculation of spin wave dispersions in magnetic nanostructures
TL;DR: In this paper, numerical calculations of spin wave dispersions in magnetic nanostructures are presented by processing the space-time data calculated using the finite difference method based micromagnetic simulations.
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Techniques in micromagnetic simulation and analysis
Dheeraj Kumar,A. O. Adeyeye +1 more
Abstract: Advances in nanofabrication now allow us to manipulate magnetic material at micro- and nanoscales. As the steps of design, modelling and simulation typically precede that of fabrication, these improvements have also granted a significant boost to the methods of micromagnetic simulations (MSs) and analyses. The increased availability of massive computational resources has been another major contributing factor. Magnetization dynamics at micro- and nanoscale is described by the Landau–Lifshitz–Gilbert (LLG) equation, which is an ordinary differential equation (ODE) in time. Several finite difference method (FDM) and finite element method (FEM) based LLG solvers are now widely use to solve different kind of micromagnetic problems. In this review, we present a few patterns in the ways MSs are being used in the pursuit of new physics. An important objective of this review is to allow one to make a well informed decision on the details of simulation and analysis procedures needed to accomplish a given task using computational micromagnetics. We also examine the effect of different simulation parameters to underscore and extend some best practices. Lastly, we examine different methods of micromagnetic analyses which are used to process simulation results in order to extract physically meaningful and valuable information.
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Effect of magnetization pinning on the spectrum of spin waves in magnonic antidot waveguides
Jarosław W. Kłos,Dheeraj Kumar,J. Romero-Vivas,Hans Fangohr,Matteo Franchin,Maciej Krawczyk,Anjan Barman +6 more
TL;DR: In this article, the spin-wave spectra in magnonic antidot waveguides (MAWs) were studied for two limiting cases (strong and negligible) of the surface anisotropy at the ferromagnet/air interface.
Detection of picosecond magnetization dynamics of 50 nm magnetic dots down to the single dot regime
Bivas Rana,Dheeraj Kumar,Saswati Barman,Semanti Pal,Yasuhiro Fukuma,Yoshichika Otani,Anjan Barman +6 more
TL;DR: All-optical time-domain detection of picosecond magnetization dynamics of arrays of 50 nm Ni(80)Fe(20) (permalloy) dots down to the single nanodot regime and one dominant resonant mode corresponding to the edge mode of the 50 nm dot with slightly higher damping is reported.
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