Robotic Composites and Compositions Article 2025

Jamming with magnetic composites

Thumb ticker sm buseaktas headshot 2024
Robotic Composites and Compositions
Max Planck Research Group Leader

The jamming transition—marked by dramatic changes in mechanical properties, such as stiffness and damping—enables programmable and adaptive structures for robotic applications. This phenomenon, driven by changes in the coupling between individual subunits of an aggregate, can be controlled through external actuation sources. Existing jamming actuation methods, such as applying a vacuum with an airtight envelope, pose significant limitations, as they require the structures to be tethered, limiting reconfigurability and scalability. Here, we introduce an untethered jamming mechanism based on magnetic interactions between soft-ferromagnetic composites. We establish composite design principles to program the magnetization of the subunits, demonstrate linear, planar, and volumetric jamming and shape-locking, and model the magneto-mechanical behavior. This approach contributes to the development of jamming-based materials in which the jamming directions and transition points can be tuned on-the-fly by adjusting the external magnetic field orientation and strength, respectively.

Author(s): Aktaş, Buse and Kim, Minsoo and Baeckert, Marc and Sicilia, Gianluca and Franchini, Gian-Luca and Heemeyer, Florian and Gervasoni, Simone and Chen, XiangZhong and Pane, Salvador and Nelson, Bradley
Journal: Nature Communications
Volume: 16
Pages: 8711
Year: 2025
Month: September
Day: 30
Project(s):
BibTeX Type: Article (article)
DOI: https://doi.org/10.1038/s41467-025-63729-z
State: Published
URL: https://doi.org/10.1038/s41467-025-63729-z

BibTeX

@article{MagneticJamming,
  title = {Jamming with magnetic composites},
  journal = {Nature Communications},
  abstract = {The jamming transition—marked by dramatic changes in mechanical properties, such as stiffness and damping—enables programmable and adaptive structures for robotic applications. This phenomenon, driven by changes in the coupling between individual subunits of an aggregate, can be controlled through external actuation sources. Existing jamming actuation methods, such as applying a vacuum with an airtight envelope, pose significant limitations, as they require the structures to be tethered, limiting reconfigurability and scalability. Here, we introduce an untethered jamming mechanism based on magnetic interactions between soft-ferromagnetic composites. We establish composite design principles to program the magnetization of the subunits, demonstrate linear, planar, and volumetric jamming and shape-locking, and model the magneto-mechanical behavior. This approach contributes to the development of jamming-based materials in which the jamming directions and transition points can be tuned on-the-fly by adjusting the external magnetic field orientation and strength, respectively.},
  volume = {16},
  pages = {8711},
  month = sep,
  year = {2025},
  author = {Aktaş, Buse and Kim, Minsoo and Baeckert, Marc and Sicilia, Gianluca and Franchini, Gian-Luca and Heemeyer, Florian and Gervasoni, Simone and Chen, XiangZhong and Pane, Salvador and Nelson, Bradley},
  doi = {https://doi.org/10.1038/s41467-025-63729-z},
  url = {https://doi.org/10.1038/s41467-025-63729-z},
  month_numeric = {9}
}