Title: Locally probing the magnetization of hybrid magnet-superconductor systems (invited talk)
Authors: Van Bael, Margriet
Couet, Sebastien
Trekels, Maarten
rüffer, Rudolf
Cuppens, Jo
Petermann, Claire
Vantomme, André
Temst, Kristiaan
Issue Date: 2012
Conference: 1st World Congress on Advanced Materials edition:1 location:Beijing, China date:5-8 June 2012
Abstract: Locally probing the magnetization of hybrid magnet-superconductor systems

Margriet J. Van Bael*1, S. Couet2, M. Trekels2, R. Rüffer3, J. Cuppens1, C. Petermann2, A. Vantomme2, K. Temst2
1KU Leuven, Laboratory of Solid State Physics and Magnetism, Belgium
2KU Leuven, Instituut voor Kern-en Stralingsfysica, Belgium
3European Synchrotron Radiation Facility, France


Hybrid magnetic/superconductor systems attract a lot of interest due to the proximity effects at a superconductor/ferromagnet (S/F) interface or because of the interactions between magnetic nanostructures and quantized flux lines in a superconducting film. It was shown, e.g., by global transport and magnetization measurements and local magnetic imaging at the surface, that the flux pinning depends on the magnetization polarity and domain state of nanoscale ferromagnetic dots. In most studies, the influence of the magnet on the superconductor is considered, while the reverse, the influence of the superconductor on the magnet is much less investigated. Moreover, it has always remained a challenge to probe the magnetization inside the superconductor, especially in S/F hybrids. Here, we use hybrid Nb/Fe/Nb trilayers to demonstrate that ultrathin 57Fe layers can be used to probe the magnetization inside a superconducting film. The proposed isotope-specific method is based on nuclear resonant scattering of synchrotron radiation and probes the local hyperfine field present at the nucleus of specific Mössbauer isotopes such as 57Fe. We demonstrate this approach by measuring the magnetic response of a Nb/Fe/Nb trilayer, allowing to investigate the magnetization within the superconducting layer. It is found that entering the superconducting state leads to a change in the Fe hyperfine field angle below Tc. This proof of principle experiment opens opportunities, particularly for the study of ferromagnet/superconductor hybrids.
Publication status: published
KU Leuven publication type: IMa
Appears in Collections:Solid State Physics and Magnetism Section
Nuclear and Radiation Physics Section

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