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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Colloquium: Experiments in vortex avalanches
TL;DR: Avalanche dynamics are found in many phenomena, from earthquakes to the evolution of species as mentioned in this paper, and they can also be found in vortex matter when a type-II superconductor is externally driven, for example, by an increasing magnetic field.
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Direct observation of the current distribution in thin superconducting strips using magneto-optic imaging
Tom H. Johansen,M. Baziljevich,H. Bratsberg,Yu. M. Galperin,Poul Erik Lindelof,Y. Shen,P. Vase +6 more
TL;DR: Results on the behavior of the Bi-doped YIG film with in-plane anisotropy which the authors use as field indicator are presented, explaining why previous measurements of flux density profiles have displayed surprisingly large deviations from the expected behavior.
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Dendritic magnetic instability in superconducting MgB2 films
Tom H. Johansen,M. Baziljevich,D. V. Shantsev,P. E. Goa,Y. M. Gal pe rin,Won Nam Kang,Hyun-Jin Kim,Eun-Mi Choi,M. S. Kim,Seungseok Lee +9 more
TL;DR: In this paper, it was shown that below 10 K the penetration of magnetic flux in MgB2 films is dominated by dendritic structures abruptly formed in response to an applied field, and that these structures show a temperature-dependent morphology ranging from quasi-1D at 4 K to large tree-like structures near 10 K.
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Very strong intrinsic flux pinning and vortex avalanches in (Ba,K)Fe2As2 superconducting single crystals
Xiaolin Wang,Shaban Reza Ghorbani,Sung-Ik Lee,Shi Xue Dou,Chengtian Lin,Tom H. Johansen,Tom H. Johansen,Karl-Heinz Müller,Zhenxiang Cheng,Germanas Peleckis,M. Shabazi,Atle Jorstad Qviller,V. V. Yurchenko,G. L. Sun,D. L. Sun +14 more
TL;DR: In this article, it was shown that the (Ba,K)Fe2As2 single crystals become isotropic at low temperatures and high magnetic fields, resulting in a very rigid vortex lattice, even in fields very close to Hc2.
Journal ArticleDOI
Dendritic magnetic instability in superconducting MgB2 films
Tom H. Johansen,M. Baziljevich,D. V. Shantsev,P. E. Goa,Yu. M. Galperin,Won Nam Kang,Hyun-Jin Kim,Eun-Mi Choi,M. S. Kim,Sung-Ik Lee +9 more
TL;DR: In this paper, magneto-opitcal studies of a c-oriented epitaxial MgB2 film show that below 10 K the global penetration of vortices is dominated by complex dendritic structures abruptly entering the film.