Tootfinder

Exploring Weak Turbulence of Phonon and Magnon Beams in Magneto-Acoustic Ultrathin Films
Vladimir L. Safonov, Derek A. Bas, Andrew Franson, Piyush J. Shah, Michael E. McConney, Michael Newburger, Michael R. Page
https://arxiv.org/abs/2508.01903

Exploring Weak Turbulence of Phonon and Magnon Beams in Magneto-Acoustic Ultrathin Films
This study presents a simple theoretical model describing narrow envelope surface acoustic waves (phonons) and spin waves (magnons) in an ultrathin ferromagnetic film. Based on the general principles of weak wave turbulence, the model considers interactions between beams of an ideal phonon gas and a weakly non-ideal magnon gas, which represent magnetoacoustic oscillations in the system. Equations for the wave envelopes of phonons and magnons, along with their harmonics, are derived, i…

Strain-induced Dynamic Spin-Phonon Coupling in Epitaxial RuO2 Films
In Hyeok Choi, Seung Gyo Jeong2, Jae Hyuck Lee, San Kang, Sreejith Nair, Changyoung Kim, Dirk Wulferding, Bharat Jalan, Jong Seok Lee
https://arxiv.org/abs/2509.23969

Strain-induced Dynamic Spin-Phonon Coupling in Epitaxial RuO2 Films
Magnetic order parameters in altermagnets can couple to quantized lattice vibration via both piezomagnetic and magnetoelastic effects, leading to the renormalization of phonon dispersion. Here, we demonstrate photo-induced dynamic frequency modulation of THz phonons excited in anisotropically-strained epitaxial RuO2 thin films using ultrafast coherent phonon spectroscopy and time-resolved magneto-optic Kerr effect measurement. A coherent oscillation of a transverse acoustic phonon appears in th…

Vortex Pinning in Niobium covered by a thin polycrystalline Gold
Wenbin Li, Ivan Villani, Ylea Vlamidis, Matteo Carrega, Letizia Ferbel, Leonardo Sabattini, Antonio Rossi, Wen Si, Stefano Veronesi, Camilla Coletti, Sergio Pezzini, Masahiro Haze, Yukio Hasegawa, Stefan Heun
https://arxiv.org/abs/2507.22515

Vortex Pinning in Niobium covered by a thin polycrystalline Gold
Owing to its superconducting properties, Niobium (Nb) is an excellent candidate material for superconducting electronics and applications in quantum technology. Here we perform scanning tunneling microscopy and spectroscopy experiments on Nb films covered by a thin gold (Au) film. We investigate the minigap structure of the proximitized region and provide evidence for a highly transparent interface between Nb and Au, beneficial for device applications. Imaging of Abrikosov vortices in presence …

Magnetic force microscopy versus scanning quantum-vortex microscopy: Probing pinning landscape in granular niobium films
A. Yu. Aladyshkin, R. A. Hovhannisyan, S. Yu. Grebenchuk, S. A. Larionov, A. G. Shishkin, O. V. Skryabina, A. V. Samokhvalov, A. S. Mel'nikov, D. Roditchev, V. S. Stolyarov
https://arxiv.org/abs/2507.05172…

Magnetic force microscopy versus scanning quantum-vortex microscopy: Probing pinning landscape in granular niobium films
We provide an overview of the methodology and fundamental principles associated with newly developed experimental technique -- scanning quantum-vortex microscopy [Hovhannisyan et al., Commun. Mater., vol. 6, 42 (2025)]. This approach appears promising for experimental studies of vortex pinning phenomena in superconducting films and nanodevices. In particular, we studied the magnetic properties of magnetron-sputtered niobium (Nb) films by low-temperature magnetic force microscopy. As the tempera…

Free electron charging of microdroplets in a plasma at atmospheric pressure
Nourhan Hendawy, Harold McQuaid, Somhairle Mag Uidhir, David Rutherford, Declan Diver, Davide Mariotti, Paul Maguire
https://arxiv.org/abs/2508.13372

Free electron charging of microdroplets in a plasma at atmospheric pressure
Gas phase microdroplets have recently demonstrated exceptional chemical properties via suspected mechanisms such as contact electrification and surface charge pinning leading, in turn, to high electric fields at the surface. In this work, microdroplets are injected into a low temperature flowing gas plasma at atmospheric pressure and during flight they are subject to an excess free electron flux. We report the first measurements of particle charge acquired in a fully collisional plasma with ave…

Nanosculpting lateral weak link junctions in superconducting Fe(Te,Se)/Bi2Te3 with focused Si ions and implications on vortex pinning
Debarghya Mallick, Sujoy Ghosh, An Hsi Chen, Qiangsheng Lu, Liam Collins, Sangsoo Kim, Gyula Eres, Ivan Kravchenko, Stephen Jesse, Steven J. Randolph, Scott T. Retterer, Matthew Brahlek, Robert G. Moore
https://

Nanosculpting lateral weak link junctions in superconducting Fe(Te,Se)/Bi2Te3 with focused Si++ ions and implications on vortex pinning
Superconductor-normal-superconductor (SC-N-SC) weak links enable Cooper-pair tunneling and serve as Josephson junctions (JJs) used in modern superconducting qubits. Conventional JJs rely on vertically stacked Al-AlOx-Al trilayers that are difficult to fabricate and are sensitive to ambient exposure. Here, we demonstrate an all-in-plane alternative by "nanosculpting" ~100 nm-wide channels into thin films of FeTe0.75Se0.25/Bi2Te3 (FTS/BT), a candidate topological superconductor, with a Si++ focus…