Reduction of Microwave Loss by Mobile Fluxons in Grooved Nb Films

Dobrovolskiy, Oleksandr V.; Sachser, Roland; Bevz, V. M.; Lara, Antonio; Aliev, F. G.; Shklovskij, Valerij A.; Bezuglyj, A. I.; Вовк, Р. В.; Huth, Michael

doi:10.1002/pssr.201800223

Cited by 17 publications

(11 citation statements)

References 47 publications

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“…where D is the quasiparticle diffusion coefficient and ζ(x) is the Riemann function. Thus, the relaxation of quasiparticles is pivotal in almost all phenomena harbouring non-equilibrium superconductivity [11][12][13][14][15][16][17][18][19][20]. In particular, it governs triggering vortex avalanches and dc-assisted microwave quenching in transmission lines [21][22][23], and is crucial for photon detection [24][25][26] and optical control of dynamical states [27].…”

Section: Introductionmentioning

confidence: 99%

Fast Dynamics of Guided Magnetic Flux Quanta

et al. 2019

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The dynamics of Abrikosov vortices in superconductors is usually limited to vortex velocities v ≃ 1 km/s above which samples abruptly transit into the normal state. In the Larkin-Ovchinnikov framework, near the critical temperature this is because of a flux-flow instability triggered by the reduction of the viscous drag coefficient due to the quasiparticles leaving the vortex cores. While the existing instability theories rely upon a uniform spatial distribution of vortex velocities, the measured (mean) value of v is always smaller than the maximal possible one, since the distribution of v never reaches the δ-functional shape. Here, by guiding magnetic flux quanta at a tilt angle of 15 • with respect to a Co nanostripe array, we speed up vortices to supersonic velocities. These exceed v in the reference as-grown Nb films by almost an order of magnitude and are only a factor of two smaller than the maximal vortex velocities observed in superconductors so far. We argue that such high v values appear in consequence of a collective dynamic ordering when all vortices move in the channels with the same pinning strength and exhibit a very narrow distribution of v. Our findings render the well-known vortex guiding effect to open prospects for investigations of ultrafast vortex dynamics.

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Section: Introductionmentioning

confidence: 99%

Fast Dynamics of Guided Magnetic Flux Quanta

et al. 2019

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“…[747] Furthermore, the combination of superconductors with ferromagnets in curvilinear geometries should open novel prospects for superconducting spintronics, [748] proximity-induced spin-triplet superconductivity, [651,749] magnetic cloaking, [667,750] hybrid superconductor-ferromagnetic metamaterials [751][752][753] and the improvement of current-carrying ability of superconductors. [754,755] In addition, ferromagnetic decoration of curvilinear superconductors is expected to modify the signatures of vortex guiding [756,757] and ratchet effects, [758] flux-flow instability, [722,756,759] microwavestimulated superconductivity in the vortex state, [716,760] thereby advancing the development of 3D fluxonic circuits. [29,30]…”

Section: Discussionmentioning

confidence: 99%

New Dimension in Magnetism and Superconductivity: 3D and Curvilinear Nanoarchitectures

et al. 2021

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condensed matter physics, including cell membranes, [1] nematic crystals, [2,3] superfluids, [4] semiconductors, [5][6][7][8] ferromagnets, [9] and superconductors. [10,11] Currently, much attention is paid to strongly correlated electronic systems, for example, ferromagnets and superconductors, as they provide a unique tool to manipulate the topology of coexisting vector and scalar fields, associated with geometries of conventional systems.Until recently, in the case of magnetism, the influence of the geometry on the spin vector fields was addressed primarily by the design of the sample boundaries. This approach naturally brings the shape anisotropy to the system and leads to the formation of specific spin textures, for example, magnetic vortices [12] and antivortices [13] as well as provides control over the dynamics of the topologically nontrivial magnetic solitons. [14][15][16][17][18] This discussion also tackles the state of the art in modern experimental antiferromagnetism, where the design of the sample topography and boundaries allows to control the domain wall states. [19][20][21][22] With the development of novel fabrication techniques allowing to realize complex 3D architectures, not only the boundary effects but also the extrinsic geometrical properties (e.g., local curvatures) can be addressed rigorously for the case of ferromagnets [23][24][25][26][27] as well as superconductors. [28][29][30] The explored effects are directly related to the interplay between the Traditionally, the primary field, where curvature has been at the heart of research, is the theory of general relativity. In recent studies, however, the impact of curvilinear geometry enters various disciplines, ranging from solid-state physics over soft-matter physics, chemistry, and biology to mathematics, giving rise to a plethora of emerging domains such as curvilinear nematics, curvilinear studies of cell biology, curvilinear semiconductors, superfluidity, optics, 2D van der Waals materials, plasmonics, magnetism, and superconductivity. Here, the state of the art is summarized and prospects for future research in curvilinear solid-state systems exhibiting such fundamental cooperative phenomena as ferromagnetism, antiferromagnetism, and superconductivity are outlined. Highlighting the recent developments and current challenges in theory, fabrication, and characterization of curvilinear micro-and nanostructures, special attention is paid to perspective research directions entailing new physics and to their strong application potential. Overall, the perspective is aimed at crossing the boundaries between the magnetism and superconductivity communities and drawing attention to the conceptual aspects of how extension of structures into the third dimension and curvilinear geometry can modify existing and aid launching novel functionalities. In addition, the perspective should stimulate the development and dissemination of research and development oriented techniques to facilitate rapid transitions from laboratory demonstrations to industry-...

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“…Oleksandr Dobrovolskiy et al fabricated superconducting Nb films with an array of nanogrooves. Subjecting those samples to a high‐frequency ac current stimulus and tuning the number of mobile and pinned vortices by varying the magnetic field around the matching values, they observed a surprising effect: the vortex‐related microwave excess loss for mobile vortices became smaller than that for pinned vortices in a certain range of power levels at ac current frequencies above 100 MHz.…”

Section: Methodsmentioning

confidence: 99%

Topology and Geometry Controlled Properties of Nanoarchitectures

Fomin

2019

Physica Rapid Research Ltrs

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Reduction of Microwave Loss by Mobile Fluxons in Grooved Nb Films

Cited by 17 publications

References 47 publications

Fast Dynamics of Guided Magnetic Flux Quanta

Fast Dynamics of Guided Magnetic Flux Quanta

New Dimension in Magnetism and Superconductivity: 3D and Curvilinear Nanoarchitectures

Topology and Geometry Controlled Properties of Nanoarchitectures

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