Article (Scientific journals)
Direct visualization of magnetic vortex pinning in superconductors
Menghini, Mariela; Kramer, R. B. G.; Silhanek, Alejandro et al.
2009In Physical Review. B, Condensed Matter, 79 (14)
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Keywords :
flux pinning; lead compounds; magnetic domain walls; scanning probe microscopy; superconducting thin films; type I superconductors
Abstract :
[en] We study the vortex structure in a Pb film deposited on top of a periodic array of ferromagnetic square microrings by combining two high-resolution imaging techniques: Bitter decoration and scanning Hall-probe microscopy (SHPM). The periodicity and strength of the magnetic pinning potential generated by the square microrings are controlled by the magnetic history of the template. When the square rings are in the magnetized dipolar state, known as the onion state, the strong stray field generated at the domain walls prevents the decoration of vortices. SHPM images show that the stray field generated by the dipoles is much stronger than the vortex field, in agreement with the results of simulations. Real-space vortex imaging has revealed that in the onion state, the corners of the square rings act as effective pinning centers for vortices.
Disciplines :
Physics
Author, co-author :
Menghini, Mariela
Kramer, R. B. G.
Silhanek, Alejandro  ;  Katholieke Universiteit Leuven - KUL
Sautner, J.
Metlushko, V.
De Keyser, K.
Fritzsche, J.
Verellen, N.
Moshchalkov, V. V.
Language :
English
Title :
Direct visualization of magnetic vortex pinning in superconductors
Publication date :
2009
Journal title :
Physical Review. B, Condensed Matter
ISSN :
0163-1829
eISSN :
1095-3795
Publisher :
American Institute of Physics, New York, United States - New York
Volume :
79
Issue :
14
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 08 November 2011

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