Tootfinder

Spin current generation driven by skyrmion dynamics under magnetic anisotropy and polarized microwaves
Seno Aji, Muhammad Anin Nabail Azhiim, Nur Ika Puji Ayu, Adam Badra Cahaya, Koichi Kusakabe, Muhammad Aziz Majidi
https://arxiv.org/abs/2507.09126

Spin current generation driven by skyrmion dynamics under magnetic anisotropy and polarized microwaves
We have investigated the spin-current pumped by the skyrmion-host material with the lack of inversion symmetry through the microwave resonance process. The effects of magnetic anisotropy and polarized microwaves are examined by micromagnetic simulations. Our results reveal two distinct skyrmion phases, designated as SkX type-I and II, which emerge at low ($K_z<0.1$ meV) and high ($K_z>0.1$ meV) magnetic anisotropy constants, respectively, having different characteristics of spin excitations. Th…

Global minimality of the Hopf map in the Faddeev-Skyrme model with large coupling constant
Andr\'e Guerra, Xavier Lamy, Konstantinos Zemas
https://arxiv.org/abs/2507.10686

Global minimality of the Hopf map in the Faddeev-Skyrme model with large coupling constant
We prove that, modulo rigid motions, the Hopf map is the unique minimizer of the Faddeev--Skyrme energy in its homotopy class, for a sufficiently large coupling constant.

Skyral, a London-based modeling and simulation startup developing AI-based digital twin tech for defense, healthcare, and other sectors, raised a $20M Series A (Lucy Adams/Tech.eu)
https://tech.eu/2025/06/04/uk-based-sk

UK-based Skyral raises $20M Series A to expand modelling and simulation tech globally
British modelling and simulation startup Skyral has secured $20 million in Series A funding, led by NOIA Capital in partnership with Accrete Capital, as it looks to expand the global reach of its AI-enabled digital twin technology across sectors including defence, national security, healthcare, and infrastructure. Founded in June 2023 and headquartered in the UK, Skyral is developing a next-generation platform that combines digital twin modelling with artificial intelligence to simulate comple…

Iconic Brazil nut crop plunges after extreme drought, skyrocketing prices https://news.mongabay.com/2025/07/iconic-brazil-nut-crop-plunges-after-extreme-drought-skyrocketing-prices/

Iconic Brazil nut crop plunges after extreme drought, skyrocketing prices
A vital Amazonian superfood suddenly vanishes, leaving thousands of Indigenous and extractivist families reeling.

Hydrogen toggling between Yoshimori spin spirals and elliptical Dzyaloshinskii-Moriya skyrmions in Fe on Ir(110)
Timo Knispel, Vasily Tseplyaev, Gustav Bihlmayer, Stefan Bl\"ugel, Thomas Michely, Jeison Fischer
https://arxiv.org/abs/2507.08531

Hydrogen toggling between Yoshimori spin spirals and elliptical Dzyaloshinskii-Moriya skyrmions in Fe on Ir(110)
Skyrmions are particle-like spin textures that arise from spin spiral states in the presence of an external magnetic field. These spirals can originate from either frustrated Heisenberg exchange interactions or the interplay between exchange interactions and the relativistic Dzyaloshinskii-Moriya interaction, leading to atomic- and mesoscale textures, respectively. However, the conversion of exchange-stabilized spin spirals into skyrmions typically requires magnetic fields that exceed practical…

Join Kevin Liang at this year's Berlin Buzzwords, where he will discuss how Apache Solr/Lucene builds dense vector indexes and talk about how he and his team optimised their dense vector setup, sharing the challenges they faced and the best practices they learned along the way.
Learn more: https…

Thermodynamic theory of square skyrmion lattice in tetragonal frustrated antiferromagnets
Oleg I. Utesov, Danila P. Budylev
https://arxiv.org/abs/2507.08407

Thermodynamic theory of square skyrmion lattice in tetragonal frustrated antiferromagnets
High-temperature part of the phase diagram of tetragonal frustrated antiferromagnets is discussed within the framework of the mean-field approach. Based on recent experimental and theoretical studies, we consider a model including frustrated Heisenberg exchange, biquadratic exchange, anisotropic exchange, and magnetodipolar interaction. It is analytically demonstrated that a subtle interplay among these interactions results in a variety of phase diagrams in the temperature-magnetic field plane.…

Hydrodynamics of chiral nematics in a channel and sudden contraction geometry
Isreal Morawo, Dana Grecov
https://arxiv.org/abs/2506.11933 https://

Hydrodynamics of chiral nematics in a channel and sudden contraction geometry
This study investigates the influence of chirality, viscous effects, and confinement geometry on the flow dynamics and defect structures of cholesteric liquid crystals (CLCs) using numerical simulations. As chiral strength increases, $π$-twist defects form at low chirality and progressively organize into hexagonal domains resembling blue phase--like (BP-like) structures at higher chirality. At sufficiently high chirality and aspect ratios, skyrmion-like configurations emerge, indicating the fo…

Fall of Avalon is such a great game. It’s old school Bethesda like Skyrim with combat and magic.
#gaming #fallofavalon

Three-dimensional topological orbital Hall effect caused by magnetic hopfions
B\"orge G\"obel, Samir Lounis
https://arxiv.org/abs/2506.11448 http…

Three-dimensional topological orbital Hall effect caused by magnetic hopfions
Magnetic hopfions are non-collinear spin textures that are characterized by an integer topological invariant, called Hopf index. The three-dimensional magnetic solitons can be thought of as a tube with a twisted magnetization that has been closed at both ends to form a torus. The tube consists of a magnetic whirl called in-plane skyrmion or bimeron. Although hopfions have been observed by microscopy techniques, their detection remains challenging as they lack an electronic hallmark so far. Here…