Magnetic moment jumps in flat and nanopatterned Nb thin-walled cylinders
| Autor: | Š. Chromik, Michael Huth, Š. Gazi, Nadav Katz, Roland Sachser, M. I. Tsindlekht, Felix Zeides, V.M. Genkin, Oleksandr V. Dobrovolskiy, Israel Felner |
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| Rok vydání: | 2017 |
| Předmět: |
Superconductivity
Materials science Condensed matter physics Magnetic moment Energy Engineering and Power Technology 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Magnetic flux Electronic Optical and Magnetic Materials Vortex Cylinder (engine) law.invention Magnetic field Magnetization Magnetic anisotropy law Condensed Matter::Superconductivity 0103 physical sciences Electrical and Electronic Engineering 010306 general physics 0210 nano-technology |
| Zdroj: | Physica C: Superconductivity and its Applications. 533:101-104 |
| ISSN: | 0921-4534 |
| Popis: | Penetration of magnetic flux into hollow superconducting cylinders is investigated by magnetic moment measurements. The magnetization curves of a flat and a nanopatterned thin-walled superconducting Nb cylinders with a rectangular cross section are reported for the axial field geometry. In the nanopatterned sample, a row of micron-sized antidots (holes) was milled in the film along the cylinder axis. Magnetic moment jumps are observed for both samples at low temperatures for magnetic fields not only above H c 1 , but also in fields lower than H c 1 , i. e., in the vortex-free regime. The positions of the jumps are not reproducible and they change from one experiment to another, resembling vortex lattice instabilities usually observed for magnetic fields larger than H c 1 . At temperatures above 0.66 T c and 0.78 T c the magnetization curves become smooth for the patterned and the as-prepared sample, respectively. The magnetization curve of a reference flat Nb film in the parallel field geometry does not exhibit jumps in the entire range of accessible temperatures. |
| Databáze: | OpenAIRE |
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