Zobrazeno 1 - 10
of 933
pro vyhledávání: '"Radu, Florin A."'
We consider the fully dynamic Biot-Allard model, which includes memory effects. Convolution integrals in time model the history of the porous medium. We use a series representation of the dynamic permeability in the frequency domain to rewrite the eq
Externí odkaz:
http://arxiv.org/abs/2406.01184
Autor:
Ukleev, Victor, Utesov, Oleg I., Luo, Chen, Radu, Florin, Wintz, Sebastian, Weigand, Markus, Finizio, Simone, Winter, Moritz, Tahn, Alexander, Rellinghaus, Bernd, Karube, Kosuke, Tokura, Yoshinori, Taguchi, Yasujiro, White, Jonathan S.
The cubic $\beta$-Mn-type alloy Co$_8$Zn$_8$Mn$_4$ is a chiral helimagnet that exhibits a peculiar temperature-dependent behavior in the spiral pitch, which decreases from 130 nm at room temperature to 70 nm below 20 K. Notably, this shortening is al
Externí odkaz:
http://arxiv.org/abs/2404.14697
In this work, we consider a fully dynamic Biot model that includes memory effects due to evolving permeability. Time integrals are used to account for the change in structure. We propose an iterative splitting scheme for this model, extending the fix
Externí odkaz:
http://arxiv.org/abs/2402.07669
Numerical solutions for flows in partially saturated porous media pose challenges related to the non-linearity and elliptic-parabolic degeneracy of the governing Richards' equation. Iterative methods are therefore required to manage the complexity of
Externí odkaz:
http://arxiv.org/abs/2402.00194
This paper presents a study of solution strategies for the Cahn-Hilliard-Biot equations, a complex mathematical model for understanding flow in deformable porous media with changing solid phases. Solving the Cahn-Hilliard-Biot system poses significan
Externí odkaz:
http://arxiv.org/abs/2401.13358
In this paper we consider a nonlinear poroelasticity model that describes the quasi-static mechanical behaviour of a fluid-saturated porous medium whose permeability depends on the divergence of the displacement. Such nonlinear models are typically u
Externí odkaz:
http://arxiv.org/abs/2312.17698
Autor:
Ukleev, Victor, Ajejas, Fernando, Devishvili, Anton, Vorobiev, Alexei, Steinke, Nina-Juliane, Cubitt, Robert, Luo, Chen, Abrudan, Radu-Marius, Radu, Florin, Cros, Vincent, Reyren, Nicolas, White, Jonathan S.
Publikováno v:
Science and Technology of Advanced Materials, 25:1, 2315015, 2024
We report investigations of the magnetic textures in periodic [Pt(1 nm)/(CoFeB(0.8 nm)/Ru(1.4 nm)]$_{10}$ multilayers using polarised neutron reflectometry (PNR) and small-angle neutron scattering (SANS). The multilayers are known to host skyrmions s
Externí odkaz:
http://arxiv.org/abs/2311.05959
Autor:
Ukleev, Victor, Leroy, Ludmila, Mincigrucci, Riccardo, Deangelis, Dario, Fainozzi, Danny, Khatu, Nupur Ninad, Paltanin, Ettore, Foglia, Laura, Bencivenga, Filippo, Luo, Chen, Ruske, Florian, Radu, Florin, Svetina, Cristian, Staub, Urs
Publikováno v:
Structural Dynamics, 11, 025101, 2024
Surface acoustic waves (SAWs) are excited by femtosecond extreme ultraviolet (EUV) transient gratings (TGs) in a room-temperature ferrimagnetic DyCo$_5$ alloy. TGs are generated by crossing a pair of EUV pulses from a free electron laser (FEL) with t
Externí odkaz:
http://arxiv.org/abs/2311.01399
We investigate the well-posedness of the recently proposed Cahn-Hilliard-Biot model. The model is a three-way coupled PDE of elliptic-parabolic nature, with several nonlinearities and the fourth order term known to the Cahn-Hilliard system. We show e
Externí odkaz:
http://arxiv.org/abs/2310.18231
Autor:
Baral, Priya R., Utesov, Oleg I., Luo, Chen, Radu, Florin, Magrez, Arnaud, White, Jonathan S., Ukleev, Victor
The helical magnetic structures of cubic chiral systems are well-explained by the competition among Heisenberg exchange, Dzyaloshinskii-Moriya interaction, cubic anisotropy, and anisotropic exchange interaction (AEI). Recently, the role of the latter
Externí odkaz:
http://arxiv.org/abs/2306.03688