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Magnetization-dependent shift in ferromagnet/superconductor/ferromagnet trilayers with a strong ferromagnet
Ion C Moraru1, W P Pratt, Norman O Birge
1Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-2320, USA.
Physical Review Letters
|February 21, 2006
Summary
We studied superconducting transition temperature (Tc) in Ni/Nb/Ni trilayers. A significant 41 mK difference was observed between parallel and antiparallel magnetic states, showing promise for ferromagnet/superconductor research.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Superconductivity
Background:
- Ferromagnet/superconductor heterostructures are key to understanding emergent phenomena.
- Previous studies showed limited Tc modulation with varying magnetic states.
Purpose of the Study:
- To investigate the superconducting transition temperature (Tc) in Ni/Nb/Ni trilayers.
- To explore the influence of magnetic alignment (parallel vs. antiparallel) on Tc.
- To assess the potential of strong elemental ferromagnets in superconductor heterostructures.
Main Methods:
- Fabrication of Ni/Nb/Ni trilayer heterostructures.
- Measurement of superconducting transition temperature (Tc).
- Systematic variation of Niobium (Nb) layer thickness.
Main Results:
- Observed a significant difference in Tc between parallel (P) and antiparallel (AP) magnetic states.
- The largest Tc difference (41 mK) occurred near the critical thickness of Nb.
- This represents a substantial improvement over previous findings.
Conclusions:
- Strong elemental ferromagnets are viable for ferromagnet/superconductor heterostructures.
- The observed Tc modulation highlights the interplay between magnetism and superconductivity.
- Further research into these heterostructures is warranted.
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