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Shruti Dubey
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Shruti Dubey
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Shruti Dubey
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Dubey, Shruti
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12 results
Now showing 1 - 10 of 12
- PublicationOn the Statics of Transverse Domain Walls in Ferromagnetic Nanostrips(01-06-2020)
;Dwivedi, Sharad; Singh, Yenshembam PriyobartaIn this article, we investigate the static properties of the transverse domain wall in ferromagnetic nanostrip under the influence of a uniform transverse magnetic field. We perform the analysis under the framework of the Landau–Lifshitz–Gilbert equation, which describes the evolution of magnetization inside the ferromagnetic medium. More precisely, first, we establish the magnetization profile in the two faraway domains and then examine the static magnetization profile in the sole presence of the applied transverse magnetic field, both analytically and numerically. The obtained analytical results are in qualitatively good agreement with recent numerical simulations and experimental observations. - PublicationOn the stability of steady-states of a two-dimensional system of ferromagnetic nanowires(01-12-2017)
;Dwivedi, SharadWe investigate the stability features of steady-states of a two-dimensional system of ferromagnetic nanowires.We constitute a systemwith the finite number of nanowires arranged on the (e1, e2) plane, where (e1, e2, e3) is the canonical basis of ℝ3. We consider two cases: in the first case, each nanowire is considered to be of infinite length, whereas in the second case, we deal with finite length nanowires to design the system. In both cases, we establish a sufficient condition under which these steady-states are shown to be exponentially stable. - PublicationCurved domain walls in the ferromagnetic nanostructures with Rashba and nonlinear dissipative effects(01-05-2022)
;Shahu, Chiranjeev K. ;Dwivedi, SharadThis work reveals an analytical investigation of the curved domain wall motion in ferromagnetic nanostructures in the framework of the extended Landau-Lifshitz-Gilbert equation. To be precise, the study delineates the description of curved domain wall motion in the steady-state dynamic regime for metallic and semiconductor ferromagnets. The study is done under the simultaneous action of the Rashba field and nonlinear dissipative effects described via the viscous-dry friction mechanism. By means of reductive perturbation technique and realistic assumption on the considered parameters, we establish an analytical expression of the steady domain wall velocity that depends on mean curvature of domain wall surfaces, nonlinear dissipation coefficients, Rashba parameter, external magnetic field, and spin-polarized electric current. In particular, it is observed that the domain wall velocity, mobility, threshold, and Walker breakdown can be manipulated by the combined mechanism of the Rashba field and nonlinear dissipation coefficients. Finally, the obtained analytical results are illustrated numerically for the curved domain walls through constant-curvature surfaces under-considered scenarios. The results presented herein are in qualitatively good agreement with the recent observations. - PublicationOn the Evolution of Transverse Domain Walls in Biaxial Magnetic Nanowires(01-01-2017)
;Dwivedi, SharadIn this article, we analyze the dynamics of transverse domain walls in the framework of one-dimensional biaxial magnetic nanowires induced by the small applied magnetic fields. The evolution of magnetization in the nanowire is governed by the modified version of Landau-Lifshitz-Gilbert equation which consists of nonlinear dissipations namely dry-friction and viscous. We investigate the features of traveling wave solutions using the perturbation expansion technique. More precisely, we derive an expression for the zero order traveling wave solutions under the action of small and mild transverse magnetic fields. - PublicationOn Dynamics of Current-Induced Static Wall Profiles in Ferromagnetic Nanowires Governed by the Rashba Field(01-03-2017)
;Dwivedi, SharadThis article deals with the analytical study of propagation of static wall profiles in ferromagnetic nanowires under the effect of spin–orbit Rashba field. We consider the governing dynamics for the evolution of magnetization inside the ferromagnetic material as an extended version of Landau–Lifshitz–Gilbert–Slonczewski equation of micromagnetism. It comprises the nonlinear dissipation factors like dry-friction and viscous. We establish the threshold and Walker-type breakdown estimates of the external sources in the steady-regime and also illustrate the obtained results numerically. - PublicationField-driven Motion of Ferrofluids in Ferromagnetic Nanowire under the Influence of Inertial Effects(01-01-2015)
;Dwivedi, SharadIn this article, we investigate the field-driven motion of magnetic fluids (ferrofluids) in ferromagnetic nanowire under the influence of its own inertia. We establish the results in the framework of modified Landau-Lifschitz-Gilbert equation of micromagnetism which comprise the nonlinear dissipation factors like dry-friction and viscous. We delineate the motion in both the dynamical regimes namely the steady-state and the precessional. In the end, the physical significance of the obtained results is discussed with an aid of numerical analysis. - PublicationField-driven magnetization reversal in a three-dimensional network of ferromagnetic ellipsoidal samples(01-08-2020)
;Dwivedi, SharadThe field-driven magnetization reversal in a three-dimensional network of ferromagnetic particles of ellipsoidal shape is analytically studied with an emphasis on coupling among the particles. The considered governing dynamics is the Landau–Lifshitz equation of micromagnetism which delineates the motion of magnetization inside the ferromagnetic medium. The analytical results explicate the stability and controllability (reversal) of the relevant configurations of magnetization which are established under the sufficient conditions. To reverse the magnetization direction in the particles, we use the control as a magnetic field generated by a dipole whose position and strength can be chosen. - PublicationOn Controllability of a Two-Dimensional Network of Ferromagnetic Ellipsoidal Samples(15-01-2019)
; Dwivedi, SharadIn this article, we address the problem of stability and controllability of two-dimensional network of ferromagnetic particles of ellipsoidal shapes. The dynamics of magnetization inside the ferromagnetic material is governed by the Landau–Lifschitz equation of micromagnetism which is non-linear and parabolic in nature. The control is the magnetic field generated by a dipole whose position and amplitude can be selected. In the absence of control, first we prove the exponential stability of the relevant configurations of the network. Then, we investigate the controllability by the means of external magnetic field induced by the magnetic dipole. - PublicationOn the stability of static domain wall profiles in ferromagnetic thin film(01-01-2019)
;Dwivedi, SharadIn this article, we consider a two-dimensional model of ferromagnetic material. Our prime goal is to analyze the stability of static domain wall configuration calculated by Walker. The dynamics of magnetization inside the material is governed by the Landau–Lifschitz equation which is nonlinear and parabolic in nature. We prove the stability of the static waves solutions for the Landau–Lifschitz equation with a simplified expression of the stray field which is not unique in general, because of the non-convexity constraint |u| = 1. - PublicationOn stability of steady-statesfor a two-dimensional network model of ferromagnetic nanowires(01-01-2015)
;Dwivedi, SharadThis article concerns with the mathematical study of stability properties of steady-states for a two-dimensional network model of ferromagnetic nanowires. We consider the finite network model of ferromagnetic nanowires of semi-infinite length. We derive a sufficient condition independent of the size of the network under which the relevant configurations (steady-states) of magnetization are shown to be asymptotically stable. To be precise, we establish the result under certain condition on the length between the two consecutive nanowires. We use perturbation technique and energy method to derive the result.