Microwave emission from superconducting vortices in Mo/Si superlattices

Abstract

Most of superconductors in a magnetic field are penetrated by a lattice of quantized flux vortices. In the presence of a transport current causing the vortices to cross sample edges, emission of electromagnetic waves is expected due to the continuity of tangential components of the fields at the surface. Yet, such a radiation has not been observed so far due to low radiated power levels and lacking coherence in the vortex motion. Here, we clearly evidence the emission of electromagnetic waves from vortices crossing the layers of a superconductor/insulator Mo/Si superlattice. The emission spectra consist of narrow harmonically related peaks which can be finely tuned in the GHz range by the dc bias current and, coarsely, by the in-plane magnetic field value. Our findings show that superconductor/insulator superlattices can act as dc-tunable microwave generators bridging the frequency gap between conventional radiofrequency oscillators and (sub-)terahertz generators relying upon the Josephson effect.

Spin-wave eigenmodes in direct-write 3D nanovolcanoes

“…2 In recent years, two-photon 3D lithography and 3D direct writing by focused electron and ion beam-induced deposition (FEBID and FIBID) have become the techniques of choice for the fabrication of complex-shaped nano-architectures in magnetism, superconductivity, and plasmonics. [2][3][4]9,[28][29][30][31][32][33] For magnonics, the propagation of spin waves in direct-write Fe-and Co-based conduits has recently been demonstrated, with a spin-wave decay length in the range of 3-6 lm. 34,35 Given FEBID's lateral resolution down to 10 nm and its versatility regarding the substrate material, FEBID appears as a promising nanofabrication technology for 3D magnonics.…”

Influence of Uniform Compression on the Temperature Dependence of the Pseudogap of Medium-Praseodymium-Doped Y1−xPrxBa2Cu3O7−δ Single Crystals

“…2 with dashed lines (6-9), respectively electrical resistivity. Herewith, specific mechanisms of structural relaxation and quasiparticle scattering [29][30][31][32][33][34][35], due to the presence of kinematic and structural anisotropy in the system, can have a certain effect. Thus, taking into account certain conventionality in determining the magnitude of the T* from the deviation of ρ ab (T) from linear behavior, the agreement between the experiment and theory in our case can be considered quite satisfactory.…”

Writing 3D Nanomagnets Using Focused Electron Beams

“…We anticipate that 3D FEBID structures will also find applications in the rapidly developing field of magnon fluxonics [ 119 , 120 , 121 , 122 ], addressing the interplay of superconductivity and spin-wave physics. In addition, the suitability of FEBID for the fabrication of 3D leads should enable magneto-resistance measurements in both in-plane and out-of-plane current geometries [ 123 , 124 , 125 ].…”