arXiv subjects

Swapnil Barman

Publications and source records attributed to Swapnil Barman.

3 recordsLinked to original sources

arXiv2024

External Control over Magnon-Magnon Coupling in a Two-Dimensional Array of Square Shaped Nanomagnets

The field of hybrid magnonics has gained significant momentum in recent years, driven by its potential to enable coherent information transfer and quantum transduction. This study delves into the tunable magnon-magnon coupling within a two-dimensional array of Ni80Fe20 (Permalloy) square nanomagnets by modulating its internal magnetic field configuration. Using a broadband ferromagnetic resonance (FMR) spectroscopy, we systematically investigate the influence of the orientation of external magnetic field and microwave power on the coupling properties. Our findings reveal a pronounced anticrossing behavior, indicative of robust magnon-magnon coupling, whose strength can be tuned through both static and dynamic external parameters. The ability to modulate coupling strengths in this system highlights its potential for developing flexible and adaptive magnonic devices, crucial for future applications in quantum information processing and spintronic technologies. This work not only broadens the understanding of magnon-magnon interactions in complex geometries but also opens new avenues for the design of next-generation quantum magnonic systems.

cond-mat.mes-hall↗

arXiv2024

Reconfigurable Spin-Wave Properties in Two-Dimensional Magnonic Crystals Formed of Diamond and Triangular Shaped Nanomagnets

Two-dimensional ferromagnetic nanodot structures exhibit intriguing magnetization dynamics and hold promise for future magnonic devices. In this study, we present a comparative experimental investigation into the reconfigurable magnetization dynamics of non-ellipsoidal diamond and triangular-shaped nanodot structures, employing broadband ferromagnetic resonance spectroscopy. Our findings reveal substantial variations in the spin wave (SW) spectra of these structures under different bias field strengths (H) and angles ({\phi}). Notably, the diamond nanodot structure exhibits a variation from nearly symmetric W-shaped dispersion to a skewed dispersion and subsequent transition to a discontinuous dispersion with subtle variation in bias field angle. On the other hand, in the triangular nanodot array a SW mode anti-crossing appears at {\phi} = 15{\deg} which is starkly modified with the increase in {\phi} to 30{\deg}. By analyzing the static magnetic configurations, we unveil the nature of the SW spectra in these two shapes. We reinforce our observations with simulated spatial power and phase maps. This study underscores the critical impact of dot shape and inversion symmetry on SW dynamical response, highlighting the significance of selecting appropriate structures and bias field strength and orientation for required functionalities. The remarkable tunability demonstrated by the magnonic crystals underscores their potential suitability for future magnonic devices.

cond-mat.mes-hall↗

arXiv2022

Computational Investigation of the Magnetization Reversal and Magnetoresistive Behaviour of Nanoscale Spin Valve Elements

Investigation of the magnetic switching and magnetoresistive behaviour of nanoscale spin valve elements (SVs) of varying physical parameters such as shape, element size, dimensional aspect ratio, and array size is of vital importance for their application in future magnetic memory and storage devices. We have inspected the magnetic switching mechanism and magnetoresistive behaviour of nanoscale SV elements (Co/Cu/Ni80Fe20) and arrays of these elements, with each layer having a thickness of 10 nm and rectangular and elliptical shapes with varying lateral aspect ratios (ARs) and varying interelement spacing for the arrays, by finite difference method-based micromagnetic simulation. We observe that the elements with higher AR show the Ni80Fe20 and Co layers forming antiparallel states in the plateau, similar to synthetic antiferromagnets. For lower AR, more complex quasi-uniform magnetic microstates are observed, which are even more intricate for elliptical elements. The elliptical elements with an AR of 1.25 show coherent and predictable magnetic switching behaviour, demonstrating their appropriateness for integration into magnetic memory devices. We observe a gradual increase in magnetoresistance (MR%) with the increase in AR and the decrease in interelement spacing. The magnetic flux density experiences a reduction with an increase in the inter-elemental spacing.

cond-mat.mes-hall↗