Principal Investigator: PD Dr. habil. Oleksandr Dobrovolskiy

Scientific Staff: PhD student Sebastian Lamb-Camarena, PhD student Noura Zembaa, Master student Aram Sajdak, Dr. Khrystyna Levchenko, Dr. Sebastian Knauer, Prof. Dr. Andrii Chumak

Traditionally, the primary field where curvature has been at the heart of research was the theory of general relativity. In recent years, however, the impact of curvilinear geometry enters various disciplines ranging from solid-state physics to biology, giving rise to a plethora of emerging domains in curvilinear geometries such as plasmonics, cell biology, 2D van der Waals materials, magnetism, and superconductivity. At present, the exploration of complex-shaped nano-architectures is a rapidly developing research field with exciting novel physical phenomena stemming from the increased complexity in spin textures, frustration and magnetization dynamics, emerging because of geometry-, curvature-, and topology-induced effects.

Publications

• A Perspective on superconductivity in curved 3D nanoarchitectures
  V. M. Fomin and O. V. Dobrovolskiy
  Appl. Phys. Lett. 120, 090501 (2022)
• Complex-shaped 3D nano-architectures for magnetism and superconductivity
  O. V. Dobrovolskiy, O. V. Pylypovskyi, L. Skoric, A. Fernández-Pacheco, A. Van Den Berg, S. Ladak, M. Huth, 
  in "Curvilinear Micromagnetism: from fundamentals to applications" edited by D. Makarov and D. Sheka 
• Topological transitions in ac/dc-driven open superconductor nanotubes

V. M. Fomin, R. O. Rezaev, O. V. Dobrovolskiy
Preprint

• AC losses in macroscopic thin-walled superconducting cylinders

M. I. Tsindlekht, V. M. Genkin, I. Felner, F. Zeides, N. Katz, S. Gazi, S. Chromik, O. V. Dobrovolskiy
Preprint

• New dimension in magnetism and superconductivity: 3D and curvilinear nano-architectures

D. Makarov, O.M. Volkov, A. Kakay, O.V. Pylypovskyi, B. Budinska, O.V. Dobrovolskiy
Adv. Mater. 33 (2022) 2101758

• Merging of spin-wave modes in obliquely magnetized circular nanodots
  J. Kharlan, V. Borynskyi, S. A. Bunyaev, P. Bondarenko, O. Salyuk, V. Golub, A. A. Serga, O. V. Dobrovolskiy, A. Chumak, R. Verba, G. N. Kakazei
  Phys. Rev. B 105 (2022) 014407
• Spin-wave dispersion measurement by variable-gap propagating spin-wave spectroscopy
  M. Vanatka, K. Szulc, O. Wojewoda, C. Dubs, O. V. Dobrovolskiy, A. Chumak, M. Krawczyk, J. Klos, M. Urbanek
  Phys. Rev. Appl. 16 (2021) 054033
• Tension-free Dirac strings and steered magnetic charges in 3D artificial spin ices
  S. Koraltan, F. Slanovc, F. Bruckner, C. Nisoli, A. V. Chumak, O. V. Dobrovolskiy, C. Abert, D. Suess
  NPG Comput. Mat. 7, 125 (2021)
• Spin-wave eigenmodes in direct-write 3D nanovolcanoes
  O. V. Dobrovolskiy, N. R. Vovk, A. V. Bondarenko, S. A. Bunyaev, S. Lamb-Camarena, K. Levchenko, R. Sachser, S. Barth, A. V. Chumak, M. Huth, G. N. Kakazei
  Appl. Phys. Lett. 118, 132405 (2021)
• Engineered magnetization and exchange stiffness in direct-write Co-Fe nanoelements
  S. A. Bunyaev, B. Budinska, R. Sachser, Q. Wang, K. Levchenko, S. Knauer, A. V. Bondarenko, M. Urbanek, K. Y. Guslienko, A. V. Chumak, M. Huth, G. N. Kakazei, O. V. Dobrovolskiy
  Appl. Phys. Lett. 118, 022408 (2021)
• Writing 3D nanomagnets using focused electron beams
  A. Fernandez-Pacheco, L. Skoric, J. M. De Teresa, J. P. Navarro, M. Huth, O. V. Dobrovolskiy
  Materials 13, 3774 (2020)
• Spin-wave spectroscopy of individual ferromagnetic nanodisks
  O. V. Dobrovolskiy, S. A. Bunyaev, N. R. Vovk, D. Navas, P. Gruszecki, M. Krawczyk, R. Sachser, M. Huth, A. V. Chumak, K. Y. Guslienko, and G. N. Kakazei
  Nanoscale 12, 21207 (2020)
• Crystalline niobium carbide superconducting nanowires prepared by focused ion beam direct writing
  F. Porrati, S. Barth, R. Sachser, O. V. Dobrovolskiy, A. Seybert, A. S. Frangakis, and M. Huth
  ACS Nano 13, 6287 (2019)
• Microwave radiation detection with an ultra-thin and free standing superconducting niobium nano-helix
  S. Lösch, A. Alfonsov, O. V. Dobrovolskiy, R. Keil, V. Engemaier, S. Baunack, G. Li, O. G. Schmidt, and D. Bürger,
  ACS Nano 13, 2948 (2019)
• Microwave emission from superconducting vortices in Mo/Si superlattices
  O. V. Dobrovolskiy, V. M. Bevz, M. Yu. Mikhailov, O. I. Yuzephovich, V. A. Shklovskij, R. V. Vovk, M. I. Tsindlekht, R. Sachser, and M. Huth,
  Nature Commun. 9, 4927 (2018)