3d Topological Textures
at Surfaces and Interfaces
- a COST polytopo workshop -

11 - 12 December 2025, Karlsruhe Institute of Technology (KIT), Germany

Aim of this workshop

In 3d space, a large variety of topological textures and defects may exist. These include genuinely 3d textures such as hopfions or Bloch points. Moreover, 3d extensions of lower-dimensional textures and defects comprise, for example, 2d skyrmions becoming skyrmion strings or 2d vortices becoming vortex lines. These 3d extensions benefit from the additional dimension and may form new superstructures or disclose new dynamics. Surfaces and interfaces, natural or engineered, alter the energetic landscape and can act as stabilizing anchor points for 3d textures or as catalysts in the creation process of these.

In this workshop, we discuss
(i) the role of surfaces and interfaces in distinct condensed matter systems, and how they enable or hinder the stabilization or creation of 3d topological textures and
(ii) the derivation, implementation, and validation of boundary conditions at surfaces or interfaces.

Workshop program

Day 1: Thursday, 11 December 2025

12:00 Welcome & organizational matters

12:15 Lunch break (not included)

14:00 Jan Masell, KIT
Higher order stencils and boundary conditions in Mumax3

14:45 Peter Flauger, University of Vienna
Jump conditions for magnetoelastically coupled systems in finite differences

15:30 coffee, posters, discussions

16:00 Lars Moreels, Ghent University
Introduction to mumax+: A Novel and Extensible GPU-Accelerated Micromagnetic Simulator

16:20 Ian Lateur and Diego De Gusem, Ghent University
Implementation of magneto-elastics and its boundary conditions in mumax+

17:15 Discussion, Hands-on, Benchmarking
Test your codes, share insights, discuss implementations (and posters)

18:15 Dinner off-campus (not included)

20:00 Visit Karlsruhe Christmas Market (not included)

Day 2: Friday, 12 December 2025

09:00 Victor Laliena, University of Zaragoza
Numerical simulation of a composite magnet

09:30 Sanjay Ashok, KIT
Fractional Hopfions in Composite Magnets

10:00 Levente Rózsa, HUN-REN Wigner Research Centre for Physics
Temperature dependence of micromagnetic parameters

10:30 coffee, posters, discussions

11:00 Discussion, Hands-on, Benchmarking
Test your codes, share insights, discuss implementations (and posters)

11:45 Concluding Remarks

12:00 End

Posters

Claas Abert, University of Vienna
A finite-volume approach to micromagnetics

tba

Venue

On Day 1:

Gastdozentenhaus des KIT (guest house)
Engesserstr. 3
76131 Karlsruhe

On Day 2:

Seminar room 111
Building 10.11
KIT

Accomodation & Travel

Participants are requested to arrange accommodation and travel by themselves. A limited number of hotel rooms have been reserved by the organizers. Please indicate in your application whether you would like to make use of this opportunity. We recommend booking well in advance.

Workshop fee

There is no registration fee.

Registration

Please fill out the application form: link to form

Financial support

There is limited financial support for participants of the COST workshop which includes (i) reimbursements of the long-distance transportation costs and (ii) a daily allowance to cover hotel costs and breakfast / lunch / dinner. Please indicate in your application whether you request financial support.

Organization

The workshop is organized by:

Jan Masell, Karlsruher Institut für Technologie (KIT) & RIKEN Center for Emergent Matter Science
Markus Garst, Karlsruher Institut für Technologie (KIT)
Michele Ruggeri, University of Bologna
Claire Donnelly, Max Planck Institute for Chemical Physics of Solids

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3d Topological Textures at Surfaces and Interfaces - a COST polytopo workshop -