Transverse instabilities of multiple vortex chains in superconductor-ferromagnet bilayers.
Using scanning tunneling microscopy and Ginzburg-Landau simulations, we explore vortex configurations in magnetically coupled NbSe{sub 2}/permalloy superconductor/ferromagnet bilayer. The permalloy film with stripe domain structure induces periodic local magnetic induction in the superconductor, creating a series of pinning-antipinning channels for externally added magnetic flux quanta. Such laterally confined Abrikosov vortices form quasi-one-dimensional arrays (chains). The transitions between multichain states occur through propagation of kinks at the intermediate fields. At high fields we show that the system becomes nonlinear due to a change in both the number of vortices and the confining potential. The longitudinal instabilities of the resulting vortex structures lead to vortices 'levitating' in the antipinning channels.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 983464
- Report Number(s):
- ANL/MSD/JA-64233
- Journal Information:
- Phys. Rev. B, Journal Name: Phys. Rev. B Journal Issue: 2009 Vol. 80; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- ENGLISH
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