T
Tom H. Johansen
Researcher at University of Oslo
Publications - 343
Citations - 6957
Tom H. Johansen is an academic researcher from University of Oslo. The author has contributed to research in topics: Superconductivity & Magnetic flux. The author has an hindex of 43, co-authored 341 publications receiving 6411 citations. Previous affiliations of Tom H. Johansen include Norwegian Academy of Science and Letters & University of Wollongong.
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Logarithmic relaxation in the levitation force in a magnet‐high Tc superconductor system
TL;DR: In this article, the dynamic response of the levitation force between a permanent magnet and a bulk YBCO superconductor when subjected to a sudden motion-induced step in the magnetic field has been measured.
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Current-induced dendritic magnetic instability in superconducting MgB2 films
A. V. Bobyl,D. V. Shantsev,Tom H. Johansen,Won Nam Kang,Hyun-Jin Kim,Eun-Mi Choi,Sung-Ik Lee +6 more
TL;DR: In this article, magneto-optical imaging reveals that in superconducting films of MgB2 a pulse of transport current creates avalanche-like flux dynamics where highly branching dendritic patterns are formed.
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Lightning in superconductors
J. I. Vestgården,D. V. Shantsev,Yuri Galperin,Yuri Galperin,Tom H. Johansen,Tom H. Johansen,Tom H. Johansen +6 more
TL;DR: Numerical simulation results reveal the detailed dynamics during breakdown as within nanoseconds it develops branching structures in the electromagnetic fields and temperature, with striking resemblance of atmospheric lightning.
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Relaxation of transport current distribution in a YBaCuO strip studied by magneto-optical imaging
TL;DR: The dynamics of magnetic flux distributions across a YBa2Cu3O7−δ strip carrying transport current is measured using magneto-optical imaging at 20 K as mentioned in this paper.
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Local threshold field for dendritic instability in superconducting MgB 2 films
F. L. Barkov,D. V. Shantsev,Tom H. Johansen,P. E. Goa,Won Nam Kang,Hae Jin Kim,Eun-Mi Choi,S.-I. Lee +7 more
TL;DR: In this paper, the phenomenon of dendritic flux penetration in superconducting films was studied using magneto-optical imaging and it was shown that there exists a local threshold field controlling the nucleation and termination of the dendrite growth.