Johannes Høydahl Jensen
About
I'm a researcher at the Computing (COMP) unit at Department of Computer Science. My field of research is unconventional computing, more specifically material computation in artificial spin ice.
Research
The goal of material computation is to exploit the natural properties of materials directly for computation. Computing close to physics can be extremely efficient, since computations can happen "for free" in the physical domain. The idea is that the physical world around us is rich with interesting phenomena, many which could potentially be useful for computing.
Classical computing is top-down, and typically asks: How can this physical thing be used to build logic gates?
Material computation is bottom-up, and asks instead: What computations does this physical thing do naturally?
The current focus of my research is computation in artificial spin ice (ASI). ASI are systems of coupled nanomagnets arranged on a 2D lattice. Local interactions between the magnets gives rise to a range of complex collective behavior. As a result, ASIs are often viewed as metamaterials. ASIs are promising computing substrates due to the rich variety of emergent behavior, accompanied by considerable control and flexibility.
Research interests:
- Reservoir Computing
- Material computiation
- Artificial spin ice
- Self-organized systems
- Dynamical systems
- Evolution-in-materio
Publications
2025
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Penty, Arthur George;
Jensen, Johannes Høydahl;
Tufte, Gunnar.
(2025)
Artificial Life in-materio.
Academic chapter
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Bhandari, Dheerendra Singh;
Strømberg, Anders;
Breivik, Ida;
Penty, Arthur George;
Jensen, Johannes H.;
Foerster, Michael;
Tufte, Gunnar;
Folven, Erik.
(2025)
Clocking emergent magnetic monopoles in square artificial spin ice.
Physical review B (PRB)
Academic article
-
Penty, Arthur George;
Jensen, Johannes Høydahl;
Breivik, Ida;
Strømberg, Anders;
Folven, Erik;
Tufte, Gunnar.
(2025)
Controllable gliders in a nanomagnetic metamaterial.
Nature Communications
Academic article
2024
-
Jensen, Johannes Høydahl;
Strømberg, Anders;
Breivik, Ida;
Penty, Arthur George;
Nino, Miguel Angel;
Khaliq, Muhammad Waqas;
Foerster, Michael;
Tufte, Gunnar;
Folven, Erik.
(2024)
Clocked dynamics in artificial spin ice.
Nature Communications
Academic article
-
Aven, Thomas;
Jensen, Johannes Høydahl;
Tufte, Gunnar.
(2024)
Lattice reservoirs: symmetry breaking and information flow in physical reservoir computing.
ALIFE : Proceedings of the Artificial Life Conference
Academic article
2022
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Jensen, Johannes Høydahl;
Strømberg, Anders;
Lykkebø, Odd Rune Strømmen;
Penty, Arthur George;
Lealiaert, Jonathan;
Själander, Magnus;
Folven, Erik;
Tufte, Gunnar.
(2022)
Flatspin: A large-scale artificial spin ice simulator.
Physical review B (PRB)
Academic article
2020
-
Jensen, Johannes Høydahl;
Strømberg, Anders;
Lykkebø, Odd Rune Strømmen;
Penty, Arthur George;
Själander, Magnus;
Folven, Erik;
Tufte, Gunnar.
(2020)
flatspin: A Large-Scale Artificial Spin Ice Simulator.
arXiv.org
Academic article
-
Jensen, Johannes Høydahl;
Tufte, Gunnar.
(2020)
Reservoir Computing in Artificial Spin Ice.
ALIFE : Proceedings of the Artificial Life Conference
Academic article
2018
-
Jensen, Johannes Høydahl;
Folven, Erik;
Tufte, Gunnar.
(2018)
Computation in artificial spin ice.
Academic chapter
2017
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Jensen, Johannes;
Tufte, Gunnar.
(2017)
Reservoir Computing with a Chaotic Circuit.
Academic chapter
2016
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Nichele, Stefano;
Jensen, Johannes Høydahl;
Laketic, Dragana;
Lykkebø, Odd Rune Strømmen;
Tufte, Gunnar.
(2016)
Dynamics in Carbon Nanotubes for In-Materio Computation.
International Journal On Advances in Systems and Measurements
Academic article
Journal publications
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Bhandari, Dheerendra Singh;
Strømberg, Anders;
Breivik, Ida;
Penty, Arthur George;
Jensen, Johannes H.;
Foerster, Michael;
Tufte, Gunnar;
Folven, Erik.
(2025)
Clocking emergent magnetic monopoles in square artificial spin ice.
Physical review B (PRB)
Academic article
-
Penty, Arthur George;
Jensen, Johannes Høydahl;
Breivik, Ida;
Strømberg, Anders;
Folven, Erik;
Tufte, Gunnar.
(2025)
Controllable gliders in a nanomagnetic metamaterial.
Nature Communications
Academic article
-
Nichele, Stefano;
Jensen, Johannes Høydahl;
Laketic, Dragana;
Lykkebø, Odd Rune Strømmen;
Tufte, Gunnar.
(2016)
Dynamics in Carbon Nanotubes for In-Materio Computation.
International Journal On Advances in Systems and Measurements
Academic article
-
Jensen, Johannes Høydahl;
Strømberg, Anders;
Lykkebø, Odd Rune Strømmen;
Penty, Arthur George;
Själander, Magnus;
Folven, Erik;
Tufte, Gunnar.
(2020)
flatspin: A Large-Scale Artificial Spin Ice Simulator.
arXiv.org
Academic article
-
Jensen, Johannes Høydahl;
Tufte, Gunnar.
(2020)
Reservoir Computing in Artificial Spin Ice.
ALIFE : Proceedings of the Artificial Life Conference
Academic article
-
Jensen, Johannes Høydahl;
Strømberg, Anders;
Lykkebø, Odd Rune Strømmen;
Penty, Arthur George;
Lealiaert, Jonathan;
Själander, Magnus;
Folven, Erik;
Tufte, Gunnar.
(2022)
Flatspin: A large-scale artificial spin ice simulator.
Physical review B (PRB)
Academic article
-
Jensen, Johannes Høydahl;
Strømberg, Anders;
Breivik, Ida;
Penty, Arthur George;
Nino, Miguel Angel;
Khaliq, Muhammad Waqas;
Foerster, Michael;
Tufte, Gunnar;
Folven, Erik.
(2024)
Clocked dynamics in artificial spin ice.
Nature Communications
Academic article
-
Aven, Thomas;
Jensen, Johannes Høydahl;
Tufte, Gunnar.
(2024)
Lattice reservoirs: symmetry breaking and information flow in physical reservoir computing.
ALIFE : Proceedings of the Artificial Life Conference
Academic article
Part of book/report
-
Penty, Arthur George;
Jensen, Johannes Høydahl;
Tufte, Gunnar.
(2025)
Artificial Life in-materio.
Academic chapter
-
Jensen, Johannes Høydahl;
Folven, Erik;
Tufte, Gunnar.
(2018)
Computation in artificial spin ice.
Academic chapter
-
Jensen, Johannes;
Tufte, Gunnar.
(2017)
Reservoir Computing with a Chaotic Circuit.
Academic chapter
Teaching
Courses
Outreach
2026
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LectureJensen, Johannes Høydahl; Breivik, Ida; Penty, Arthur George; Strømberg, Anders; Kaarbø, Henrik Tidemann; Bhandari, Dheerendra Singh; Dale, Thea Marie; Själander, Magnus; Tufte, Gunnar; Folven, Erik. (2026) Directional Artificial Spin Ice. Online Artificial Spin Ice Sessions
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Conference posterJensen, Johannes Høydahl; Breivik, Ida; Penty, Arthur George; Strømberg, Anders; Kaarbø, Henrik Tidemann; Bhandari, Dheerendra Singh; Dale, Thea Marie; Själander, Magnus; Tufte, Gunnar; Folven, Erik. (2026) Directional Artificial Spin Ice. EEE International Magnetics Conference (INTERMAG 2026)
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Conference lectureJensen, Johannes Høydahl; Aven, Thomas; Hesthaug, Leon Egeberg. (2026) Physical constraints in reservoir computing. International Reservoir Computing Conference RCC 2026
2025
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LectureJensen, Johannes Høydahl; Penty, Arthur George. (2025) Nanomagnets on IDUN: mumax3 and flatspin. Research Data Infrastructure Day
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Conference lectureJensen, Johannes Høydahl; Penty, Arthur George. (2025) The Nanomagnetic Computers of the Future!. Catch IDI 2025
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Conference posterBhandari, Dheerendra Singh; Strømberg, Anders; Breivik, Ida; Penty, Arthur George; Jensen, Johannes Høydahl; Foerster, Michael; Tufte, Gunnar; Folven, Erik. (2025) Clocking of emergent magnetic monopoles in Square ASI. Frontiers in Artificial Spin Ice 2025
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Conference posterPenty, Arthur George; Jensen, Johannes Høydahl; Breivik, Ida; Strømberg, Anders; Folven, Erik; Tufte, Gunnar. (2025) Controllable Gliders in ASI. Frontiers in Artificial Spin Ice 2025
2024
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Conference lectureBhandari, Dheerendra Singh; Strømberg, Anders; Breivik, Ida; Penty, Arthur George; Jensen, Johannes Høydahl; Foerster, Micheal; Tufte, Gunnar; Folven, Erik. (2024) Clocking Emergent magnetic monopole in square Artificial Spin Ice. 25th International Colloquium on Magnetic Films and Surfaces -ICMFS2024
2023
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Conference lectureJensen, Johannes Høydahl; Strømberg, Anders; Breivik, Ida; Penty, Arthur George; Folven, Erik; Tufte, Gunnar; Foerster, Michael; Nino, Miguel Angel; Khaliq, Muhammad Waqas. (2023) Material computation and magnetic metamaterials: Clocked dynamics in artificial spin ice. Current Research in Magnetism 2023: Magnetic Neuromorphic Computing
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Conference lectureBreivik, Ida; Jensen, Johannes Høydahl; Strømberg, Anders; Penty, Arthur George; Nino, Miguel Angel; Foerster, Micheal; Tufte, Gunnar; Folven, Erik. (2023) Controlled Domain Dynamics in Artificial Spin Ice. Norwegian NanoSymposium 2023
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Conference lectureBreivik, Ida; Jensen, Johannes Høydahl; Strømberg, Anders; Penty, Arthur George; Nino, Miguel Angel; Foerster, Micheal; Tufte, Gunnar; Folven, Erik. (2023) Stepwise Domain Growth in Artificial Spin Ice. Joint European Magnetic Symposia
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Conference posterStrømberg, Anders; Breivik, Ida; Jensen, Johannes Høydahl; Lykkebø, Odd Rune Strømmen; Penty, Arthur George; Leliaert, Jonathan; Själander, Hans Magnus; Folven, Erik; Tufte, Gunnar. (2023) flatspin: A Simulation Framework for Artificial Spin Systems. Frontiers in Artificial Spin Ice Workshop
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Conference lectureJensen, Johannes Høydahl; Strømberg, Anders; Lykkebø, Odd Rune Strømmen; Penty, Arthur George; Leliaert, Jonathan; Själander, Hans Magnus; Folven, Erik; Tufte, Gunnar. (2023) flatspin: A Large-Scale Artificial Spin Ice Simulator. IEEE Advances in Magnetics 2023
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Conference lectureJensen, Johannes Høydahl. (2023) Computation in magnetic metamaterials. 2nd Online RIEC International Workshop on Spintronics
2021
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Conference lecture
2020
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Conference lectureJensen, Johannes Høydahl; Strømberg, Anders; Lykkebø, Odd Rune Strømmen; Penty, Arthur George; Själander, Magnus; Folven, Erik; Tufte, Gunnar. (2020) Introducing flatspin. Enabling Large Scale Dynamical Artificial Spin Ice Simulations. Magnetism and Magnetic Materials 2020
2019
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Conference posterStrømberg, Anders; Penty, Arthur George; Jensen, Johannes Høydahl; Lykkebø, Odd Rune Strømmen; Själander, Magnus; Tufte, Gunnar; Folven, Erik. (2019) Unconventional Computing with Artificial Spin Ice. Frontiers in Artificial Spin Ice
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Conference lectureStrømberg, Anders; Digernes, Einar; Slöetjes, Samuel Dingeman; Jensen, Johannes Høydahl; Tufte, Gunnar; Grepstad, Jostein; Folven, Erik. (2019) Magnetic Force Microscopy of Intermediate Angle Pinwheel Artificial Spin Ice. Joint European Magnetic Symposia 2019
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Conference lectureStrømberg, Anders; Digernes, Einar; Jensen, Johannes Høydahl; Tufte, Gunnar; Grepstad, Jostein; Folven, Erik. (2019) Co-existing Ferromagnetic-Antiferromagnetic Order in a Magnetic Metamaterial. Norwegian NanoSymposium 2019
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Conference lectureStrømberg, Anders; Jensen, Johannes Høydahl; Tufte, Gunnar; Folven, Erik. (2019) Long-Range Order in Tightly Packed Pinwheel Artificial Spin Ice. NanoNetwork 2019
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Conference lectureLykkebø, Odd Rune Strømmen; Jensen, Johannes Høydahl; Penty, Arthur George; Strømberg, Anders; Själander, Magnus; Folven, Erik; Tufte, Gunnar. (2019) Emergent computation on a magnetic lattice. First International Workshop on Theoretical and Experimental Material Computing (TEMC 2019)
2018
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Conference lectureStrømberg, Anders; Jensen, Johannes Høydahl; Digernes, Einar; Tufte, Gunnar; Folven, Erik. (2018) Unconventional Computing with Artificial Spin Ice. NTNU Nano Symposium 2018