Spontaneous Currents in a Ferromagnet-Normal Metal-Superconductor Trilayer

• Authors: M Krawiec , J Annett , B Györffy
• Languages of publication: EN

Abstracts

EN

We discuss the ground state properties of the system composed of a normal metal sandwiched between ferromagnet and superconductor within a tight binding Hubbard model. We solved the spin-polarized Hartree-Fock-Gorkov equations together with the Maxwell equation (Ampere's law) and found a proximity induced Fulde-Ferrell-Larkin-Ovchinnikov state in this system. Here we show that the inclusion of the normal metal layer in between those subsystems does not necessarily lead to the suppression of the Fulde-Ferrell-Larkin-Ovchinnikov phase. Moreover, we found that depending on the thickness of the normal metal slab the system can be switched periodically between the state with the spontaneous current flowing to that one with no current. All these effects can be explained in terms of the Andreev bound states formed in such structures.

Keywords

EN

72.25.-b; 74.50.+r; 75.75.+a

Discipline

• 74.50.+r: Tunneling phenomena; Josephson effects(for SQUIDs, see 85.25.Dq; for Josephson devices, see 85.25.Cp; for Josephson junction arrays, see 74.81.Fa)
• 72.25.-b: Spin polarized transport(for spin polarized transport devices, see 85.75.-d)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2006
• Volume: 109
• Issue: 4-5
• Pages: 507-512

Dates

published

2006-04

received

2005-09-25

Contributors

author

M Krawiec

• Institute of Physics and Nanotechnology Center, M. Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

author

J Annett

• H.H. Wills Physics Laboratory, University of Bristol, Tyndal Ave., Bristol BS8 1TL, UK

author

B Györffy

• H.H. Wills Physics Laboratory, University of Bristol, Tyndal Ave., Bristol BS8 1TL, UK

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Identifiers

DOI

10.12693/APhysPolA.109.507