Erik Folven

About

I study how magnetism can be controlled in complex oxide materials. In particular, I investigate the possibility to tailor the properties of ferro- and antiferromagnets by thin film epitaxy and nanopatterning. Currently, I explore the use of domain engineered nanomagnets in novel ultra-low energy magnetic logic.

I co-direct the Oxide electronics group at Department of Electronic Systems and I am a member of the network NTNU Morphogenetic Engineering.

Working with research questions at the intersection of physics, material science, and computer science, I collaborate with research groups in Norway, Belgium, USA, United Kingdom, and Switzerland. I am also an active user on several synchrotron facilities (ALS, SLS, BESSY).

Research Interests:

Domain engineering in complex oxides
Antiferromagnetic spintronics
Nanomagnetic logic (NML)
Superferromagnetism
Artificial Spin Ice
Magnetic domain imaging (X-PEEM, MFM, STXM)
Nanofabrication (EBL, FIB, Ion patterning)

Teaching:

TFE4146 Semiconductor Devices
TFE4172 Introduction to Semiconductor Devices

Publications

2022

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). volum 106 (6).

2021

Digernes, Einar Standal; Strømberg, Anders; Vaz, Carlos A. F.; Kleibert, Armin; Grepstad, Jostein; Folven, Erik. (2021) Anisotropy and domain formation in a dipolar magnetic metamaterial. Applied Physics Letters. volum 118.
Oakes, kelly; Folven, Erik; Digernes, Einar Standal. (2021) A new way to look at the inner workings of tiny magnets. Norwegian SciTech News.
Slöetjes, Samuel Dingeman; Digernes, Einar; Strømberg, Anders; Olsen, Fredrik Kjemperud; Bang, Ambjørn Dahle; N'diaye, Alpha T; Chopdekar, Rajesh V.; Folven, Erik; Grepstad, Jostein. (2021) Effects of array shape and disk ellipticity in dipolar-coupled magnetic metamaterials. Physical review B (PRB). volum 104 (13).

2020

Digernes, Einar; Leliaert, Jonathan; Weigand, Markus; Folven, Erik; Van Waeyenberge, Bartel. (2020) Direct observation of temperature dependent vortex dynamics in a La0.7Sr0.3MnO3 micromagnet. Physical Review Research (PRResearch). volum 2 (4).
Digernes, Einar; Slöetjes, Samuel Dingeman; Strømberg, Anders; Bang, Ambjørn Dahle; Olsen, Fredrik Kjemperud; Arenholz, Elke; Chopdekar, Rajesh V.; Grepstad, Jostein; Folven, Erik. (2020) Direct imaging of long-range ferromagnetic and antiferromagnetic order in a dipolar metamaterial. Physical Review Research (PRResearch). volum 2 (1).
Jensen, Johannes H.; Folven, Erik; Tufte, Gunnar. (2020) Computation in artificial spin ice. ALIFE : Proceedings of the Artificial Life Conference.
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.
Olsen, Fredrik Kjemperud; Bang, Ambjørn Dahle; Digernes, Einar; Slöetjes, Samuel Dingeman; Andreas, Scholl; Chopdekar, Rajesh V.; Tybell, Per Thomas Martin; Grepstad, Jostein; Folven, Erik. (2020) Enhanced magnetic signal along edges of embedded epitaxial La0.7Sr0.3MnO3 nanostructures. Journal of Magnetism and Magnetic Materials. volum 521 (1).
Slöetjes, Samuel Dingeman; Folven, Erik; Grepstad, Jostein. (2020) Exchange explosions of topological edge defects in a square micromagnet. Physical review B (PRB). volum 101 (1).

2019

Bang, Ambjørn Dahle; Hallsteinsen, Ingrid; Chopdekar, Rajesh V.; Olsen, Fredrik Kjemperud; Slöetjes, Samuel Dingeman; Kjærnes, Kristoffer; Arenholz, Elke; Folven, Erik; Grepstad, Jostein. (2019) Shape-imposed anisotropy in antiferromagnetic complex oxide nanostructures. Applied Physics Letters. volum 115 (11).
Bang, Ambjørn Dahle; Hallsteinsen, Ingrid; Olsen, Fredrik Kjemperud; Slöetjes, Samuel Dingeman; Retterer, Scott T; Scholl, Andreas; Arenholz, Elke; Folven, Erik; Grepstad, Jostein. (2019) Neel vector reorientation in ferromagnetic/antiferromagnetic complex oxide nanostructures. Applied Physics Letters. volum 114 (19).
Olsen, Fredrik Kjemperud; Hallsteinsen, Ingrid; Arenholtz, Elke; Tybell, Per Thomas Martin; Folven, Erik. (2019) Coexisting spin-flop coupling and exchange bias in LaFeO3/La0.7Sr0.3MnO3 heterostructures. Physical review B (PRB). volum 99 (13).
Slöetjes, Samuel Dingeman; Digernes, Einar; Klewe, Christoph; Shafer, Padraic; Li, Qian; Yang, M.; Qiu, Z.Q.; N'diaye, Alpha T; Arenholz, Elke; Folven, Erik; Grepstad, Jostein. (2019) Effects of lattice geometry on the dynamic properties of dipolar-coupled magnetic nanodisk arrays. Physical review B (PRB). volum 99 (064418).

2018

Bang, Ambjørn Dahle; Olsen, Fredrik Kjemperud; Slöetjes, Samuel Dingeman; Scholl, Andreas; Retterer, Scott T.; Vaz, Carlos; Tybell, Per Thomas Martin; Folven, Erik; Grepstad, Jostein. (2018) Magnetic domain formation in ultrathin complex oxide ferromagnetic/antiferromagnetic bilayers. Applied Physics Letters. volum 113 (13).
Jensen, Johannes Høydahl; Folven, Erik; Tufte, Gunnar. (2018) Computation in artificial spin ice. The 2018 Conference on Artificial Life.
Slöetjes, Samuel Dingeman; Digernes, Einar; Olsen, Fredrik Kjemperud; Chopdekar, Rajesh V.; Retterer, Scott T.; Folven, Erik; Grepstad, Jostein. (2018) Interplay between bulk and edge-bound topological defects in a square micromagnet. Applied Physics Letters. volum 112 (4).

2017

Hallsteinsen, Ingrid; Moreau, Magnus; Chopdekar, R.V.; Christiansen, Emil; Nord, Magnus Kristofer; Vullum, Per Erik; Grepstad, Jostein; Holmestad, Randi; Selbach, Sverre Magnus; Scholl, A; Arenholz, E; Folven, Erik; Tybell, Per Thomas Martin. (2017) Magnetic domain configuration of (111)-oriented LaFeO3 epitaxial thin films. APL Materials. volum 5 (8).
Lee, Michael S.; Wynn, Thomas A.; Folven, Erik; Chopdekar, Rajesh V.; Scholl, Andreas; Retterer, Scott; Grepstad, Jostein; Takamura, Yayoi. (2017) Temperature and Orientation Dependent Exchange Coupling in Epitaxial Oxide Micromagnets. PHYSICAL REVIEW MATERIALS. volum 1.
Slöetjes, Samuel Dingeman; Urdahl, Hans Henrik; Grepstad, Jostein; Folven, Erik. (2017) Tailoring the magnetic order in a supermagnetic metamaterial. AIP Advances. volum 7 (5).

2016

Lee, Michael S; Wynn, Thomas A; Folven, Erik; Chopdekar, Rajesh V.; Scholl, Andreas; Young, Anthony T; Retterer, Scott T; Grepstad, Jostein Kvaal; Takamura, Yayoi. (2016) Tailoring Spin Textures in Complex Oxide Micromagnets. ACS Nano. volum 10 (9).

2015

Folven, Erik; Linder, Jacob; Gomonay, Helen V.; Scholl, Andreas; Doran, Andrew; Young, Anthony; Retterer, Scott; Malik, V.K.; Tybell, Per Thomas Martin; Takamura, Yayoi; Grepstad, Jostein. (2015) Controlling the switching field in nanomagnets by means of domain-engineered antiferromagnets. Physical Review B. Condensed Matter and Materials Physics. volum 92 (9).
Hallsteinsen, Ingrid; Folven, Erik; Olsen, Fredrik Kjemperud; Chopdekar, R.V.; Rzchowski, M; Eom, C.B.; Grepstad, Jostein; Tybell, Per Thomas Martin. (2015) Crystalline symmetry controlled magnetic switching in epitaxial (111) La0.7Sr0.3MnO3 thin films. APL Materials. volum 3 (6).

2014

Folven, Erik. (2014) Skrot det gamle. Dagens næringsliv.

2013

Takamura, Yayoi; Folven, Erik; Shu, JBR; Lukes, KR; Li, Binzhi; Scholl, Andreas; Young, AT; Retterer, ST; Tybell, Thomas; Grepstad, Jostein. (2013) Spin-Flop Coupling and Exchange Bias in Embedded Complex Oxide Micromagnets. Physical Review Letters. volum 111 (10).

2012

Boschker, Jos Emiel; Folven, Erik; Monsen, Åsmund Fløystad; Wahlström, Erik; Grepstad, Jostein; Tybell, Thomas. (2012) Consequences of High Adatom Energy during Pulsed Laser Deposition of La0.7Sr0.3MnO3. Crystal Growth & Design. volum 12 (2).
Folven, Erik; Scholl, Andreas; Young, Anthony; Retterer, Scott; Boschker, Jos Emiel; Tybell, Thomas; Takamura, Yayoi; Grepstad, Jostein. (2012) Crossover from spin-flop coupling to collinear spin alignment in antiferromagnetic/ferromagnetic thin film nanostructures. Nano Letters. volum 12 (5).
Folven, Erik; Takamura, Yayoi; Grepstad, Jostein. (2012) X-PEEM study of antiferromagnetic domain patterns in LaFeO3 thin films and embedded nanostructures. Journal of Electron Spectroscopy and Related Phenomena. volum 185 (10).

2011

Boschker, Jos Emiel; Folkman, Chad; Bark, C.W.; Monsen, Åsmund Fløystad; Folven, Erik; Grepstad, Jostein; Wahlström, Erik; Eom, C.B.; Tybell, Thomas. (2011) Structural coupling across the LaAlO3/SrTiO3 interface: High-resolution x-ray diffraction study. Physical Review B. Condensed Matter and Materials Physics. volum 84 (20).
Folven, Erik; Scholl, Andreas; Young, Anthony; Retterer, Scott; Boschker, Jos Emiel; Tybell, Thomas; Takamura, Yayoi; Grepstad, Jostein. (2011) Effects of nanostructuring and substrate symmetry on antiferromagnetic domain structure in LaFeO3 thin films. Physical Review B. Condensed Matter and Materials Physics. volum 84 (22).

2010

Folven, Erik; Tybell, Thomas; Scholl, Andreas; Young, Anthony; Retterer, Scott T; Takamura, Yayoi; Grepstad, Jostein. (2010) Antiferromagnetic Domain Reconfiguration in Embedded LaFeO3 Thin Film Nanostructures. Nano Letters. volum 10 (11).
Nordseth, Ørnulf; You, Chang Chuan; Folven, Erik; Gariglio, S; Sambri, A; Triscone, JM; Reiner, JW; Ahn, CH; Tybell, Thomas; Grepstad, Jostein. (2010) Growth and characterization of (Pb,La)(Zr,Ti)O-3 thin film epilayers on SrTiO3-buffered Si(001). Thin Solid Films. volum 518 (19).
Takahashi, Ryota; Valset, K.; Folven, Erik; Eberg, Espen; Grepstad, Jostein; Tybell, Thomas. (2010) Long-range spontaneous structural ordering in barium stannate thin films. Applied Physics Letters. volum 97 (8).

Journal publications

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). volum 106 (6).
Digernes, Einar Standal; Strømberg, Anders; Vaz, Carlos A. F.; Kleibert, Armin; Grepstad, Jostein; Folven, Erik. (2021) Anisotropy and domain formation in a dipolar magnetic metamaterial. Applied Physics Letters. volum 118.
Oakes, kelly; Folven, Erik; Digernes, Einar Standal. (2021) A new way to look at the inner workings of tiny magnets. Norwegian SciTech News.
Slöetjes, Samuel Dingeman; Digernes, Einar; Strømberg, Anders; Olsen, Fredrik Kjemperud; Bang, Ambjørn Dahle; N'diaye, Alpha T; Chopdekar, Rajesh V.; Folven, Erik; Grepstad, Jostein. (2021) Effects of array shape and disk ellipticity in dipolar-coupled magnetic metamaterials. Physical review B (PRB). volum 104 (13).
Digernes, Einar; Leliaert, Jonathan; Weigand, Markus; Folven, Erik; Van Waeyenberge, Bartel. (2020) Direct observation of temperature dependent vortex dynamics in a La0.7Sr0.3MnO3 micromagnet. Physical Review Research (PRResearch). volum 2 (4).
Digernes, Einar; Slöetjes, Samuel Dingeman; Strømberg, Anders; Bang, Ambjørn Dahle; Olsen, Fredrik Kjemperud; Arenholz, Elke; Chopdekar, Rajesh V.; Grepstad, Jostein; Folven, Erik. (2020) Direct imaging of long-range ferromagnetic and antiferromagnetic order in a dipolar metamaterial. Physical Review Research (PRResearch). volum 2 (1).
Jensen, Johannes H.; Folven, Erik; Tufte, Gunnar. (2020) Computation in artificial spin ice. ALIFE : Proceedings of the Artificial Life Conference.
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.
Olsen, Fredrik Kjemperud; Bang, Ambjørn Dahle; Digernes, Einar; Slöetjes, Samuel Dingeman; Andreas, Scholl; Chopdekar, Rajesh V.; Tybell, Per Thomas Martin; Grepstad, Jostein; Folven, Erik. (2020) Enhanced magnetic signal along edges of embedded epitaxial La0.7Sr0.3MnO3 nanostructures. Journal of Magnetism and Magnetic Materials. volum 521 (1).
Slöetjes, Samuel Dingeman; Folven, Erik; Grepstad, Jostein. (2020) Exchange explosions of topological edge defects in a square micromagnet. Physical review B (PRB). volum 101 (1).
Bang, Ambjørn Dahle; Hallsteinsen, Ingrid; Chopdekar, Rajesh V.; Olsen, Fredrik Kjemperud; Slöetjes, Samuel Dingeman; Kjærnes, Kristoffer; Arenholz, Elke; Folven, Erik; Grepstad, Jostein. (2019) Shape-imposed anisotropy in antiferromagnetic complex oxide nanostructures. Applied Physics Letters. volum 115 (11).
Bang, Ambjørn Dahle; Hallsteinsen, Ingrid; Olsen, Fredrik Kjemperud; Slöetjes, Samuel Dingeman; Retterer, Scott T; Scholl, Andreas; Arenholz, Elke; Folven, Erik; Grepstad, Jostein. (2019) Neel vector reorientation in ferromagnetic/antiferromagnetic complex oxide nanostructures. Applied Physics Letters. volum 114 (19).
Olsen, Fredrik Kjemperud; Hallsteinsen, Ingrid; Arenholtz, Elke; Tybell, Per Thomas Martin; Folven, Erik. (2019) Coexisting spin-flop coupling and exchange bias in LaFeO3/La0.7Sr0.3MnO3 heterostructures. Physical review B (PRB). volum 99 (13).
Slöetjes, Samuel Dingeman; Digernes, Einar; Klewe, Christoph; Shafer, Padraic; Li, Qian; Yang, M.; Qiu, Z.Q.; N'diaye, Alpha T; Arenholz, Elke; Folven, Erik; Grepstad, Jostein. (2019) Effects of lattice geometry on the dynamic properties of dipolar-coupled magnetic nanodisk arrays. Physical review B (PRB). volum 99 (064418).
Bang, Ambjørn Dahle; Olsen, Fredrik Kjemperud; Slöetjes, Samuel Dingeman; Scholl, Andreas; Retterer, Scott T.; Vaz, Carlos; Tybell, Per Thomas Martin; Folven, Erik; Grepstad, Jostein. (2018) Magnetic domain formation in ultrathin complex oxide ferromagnetic/antiferromagnetic bilayers. Applied Physics Letters. volum 113 (13).
Slöetjes, Samuel Dingeman; Digernes, Einar; Olsen, Fredrik Kjemperud; Chopdekar, Rajesh V.; Retterer, Scott T.; Folven, Erik; Grepstad, Jostein. (2018) Interplay between bulk and edge-bound topological defects in a square micromagnet. Applied Physics Letters. volum 112 (4).
Hallsteinsen, Ingrid; Moreau, Magnus; Chopdekar, R.V.; Christiansen, Emil; Nord, Magnus Kristofer; Vullum, Per Erik; Grepstad, Jostein; Holmestad, Randi; Selbach, Sverre Magnus; Scholl, A; Arenholz, E; Folven, Erik; Tybell, Per Thomas Martin. (2017) Magnetic domain configuration of (111)-oriented LaFeO3 epitaxial thin films. APL Materials. volum 5 (8).
Lee, Michael S.; Wynn, Thomas A.; Folven, Erik; Chopdekar, Rajesh V.; Scholl, Andreas; Retterer, Scott; Grepstad, Jostein; Takamura, Yayoi. (2017) Temperature and Orientation Dependent Exchange Coupling in Epitaxial Oxide Micromagnets. PHYSICAL REVIEW MATERIALS. volum 1.
Slöetjes, Samuel Dingeman; Urdahl, Hans Henrik; Grepstad, Jostein; Folven, Erik. (2017) Tailoring the magnetic order in a supermagnetic metamaterial. AIP Advances. volum 7 (5).
Lee, Michael S; Wynn, Thomas A; Folven, Erik; Chopdekar, Rajesh V.; Scholl, Andreas; Young, Anthony T; Retterer, Scott T; Grepstad, Jostein Kvaal; Takamura, Yayoi. (2016) Tailoring Spin Textures in Complex Oxide Micromagnets. ACS Nano. volum 10 (9).
Folven, Erik; Linder, Jacob; Gomonay, Helen V.; Scholl, Andreas; Doran, Andrew; Young, Anthony; Retterer, Scott; Malik, V.K.; Tybell, Per Thomas Martin; Takamura, Yayoi; Grepstad, Jostein. (2015) Controlling the switching field in nanomagnets by means of domain-engineered antiferromagnets. Physical Review B. Condensed Matter and Materials Physics. volum 92 (9).
Hallsteinsen, Ingrid; Folven, Erik; Olsen, Fredrik Kjemperud; Chopdekar, R.V.; Rzchowski, M; Eom, C.B.; Grepstad, Jostein; Tybell, Per Thomas Martin. (2015) Crystalline symmetry controlled magnetic switching in epitaxial (111) La0.7Sr0.3MnO3 thin films. APL Materials. volum 3 (6).
Folven, Erik. (2014) Skrot det gamle. Dagens næringsliv.
Takamura, Yayoi; Folven, Erik; Shu, JBR; Lukes, KR; Li, Binzhi; Scholl, Andreas; Young, AT; Retterer, ST; Tybell, Thomas; Grepstad, Jostein. (2013) Spin-Flop Coupling and Exchange Bias in Embedded Complex Oxide Micromagnets. Physical Review Letters. volum 111 (10).
Boschker, Jos Emiel; Folven, Erik; Monsen, Åsmund Fløystad; Wahlström, Erik; Grepstad, Jostein; Tybell, Thomas. (2012) Consequences of High Adatom Energy during Pulsed Laser Deposition of La0.7Sr0.3MnO3. Crystal Growth & Design. volum 12 (2).
Folven, Erik; Scholl, Andreas; Young, Anthony; Retterer, Scott; Boschker, Jos Emiel; Tybell, Thomas; Takamura, Yayoi; Grepstad, Jostein. (2012) Crossover from spin-flop coupling to collinear spin alignment in antiferromagnetic/ferromagnetic thin film nanostructures. Nano Letters. volum 12 (5).
Folven, Erik; Takamura, Yayoi; Grepstad, Jostein. (2012) X-PEEM study of antiferromagnetic domain patterns in LaFeO3 thin films and embedded nanostructures. Journal of Electron Spectroscopy and Related Phenomena. volum 185 (10).
Boschker, Jos Emiel; Folkman, Chad; Bark, C.W.; Monsen, Åsmund Fløystad; Folven, Erik; Grepstad, Jostein; Wahlström, Erik; Eom, C.B.; Tybell, Thomas. (2011) Structural coupling across the LaAlO3/SrTiO3 interface: High-resolution x-ray diffraction study. Physical Review B. Condensed Matter and Materials Physics. volum 84 (20).
Folven, Erik; Scholl, Andreas; Young, Anthony; Retterer, Scott; Boschker, Jos Emiel; Tybell, Thomas; Takamura, Yayoi; Grepstad, Jostein. (2011) Effects of nanostructuring and substrate symmetry on antiferromagnetic domain structure in LaFeO3 thin films. Physical Review B. Condensed Matter and Materials Physics. volum 84 (22).
Folven, Erik; Tybell, Thomas; Scholl, Andreas; Young, Anthony; Retterer, Scott T; Takamura, Yayoi; Grepstad, Jostein. (2010) Antiferromagnetic Domain Reconfiguration in Embedded LaFeO3 Thin Film Nanostructures. Nano Letters. volum 10 (11).
Nordseth, Ørnulf; You, Chang Chuan; Folven, Erik; Gariglio, S; Sambri, A; Triscone, JM; Reiner, JW; Ahn, CH; Tybell, Thomas; Grepstad, Jostein. (2010) Growth and characterization of (Pb,La)(Zr,Ti)O-3 thin film epilayers on SrTiO3-buffered Si(001). Thin Solid Films. volum 518 (19).
Takahashi, Ryota; Valset, K.; Folven, Erik; Eberg, Espen; Grepstad, Jostein; Tybell, Thomas. (2010) Long-range spontaneous structural ordering in barium stannate thin films. Applied Physics Letters. volum 97 (8).

Part of book/report

Jensen, Johannes Høydahl; Folven, Erik; Tufte, Gunnar. (2018) Computation in artificial spin ice. The 2018 Conference on Artificial Life.

Teaching

Courses

Media

2017

Sævik, Bjørnar Torvholm; Folven, Erik; Jahre, Magnus; Skaar, Johannes. (2017) Ein æra er omm. nrk.no [Internett]. 2017-02-24.

2014

Folven, Erik. (2014) Jakten på fremtidens datamaskiner. Gemini [Fagblad]. 2014-10-10.
Folven, Erik. (2014) Teknisk sett - Spørsmål om spinntronikk. Teknisk Ukeblad [Fagblad]. 2014-10-30.

Språkvelger

Erik Folven

Erik Folven

About

Publications

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

Journal publications

Part of book/report

Teaching

Courses

Media

2017

2014