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Scanning SQUID Study of Vortex Manipulation by Local Contact

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Published on: February 1, 2017

Magnetic moment manipulation by a Josephson current.

F Konschelle¹, A Buzdin

¹Condensed Matter Theory Group, CPMOH, Université de Bordeaux and CNRS, F-33405 Talence, France.

Physical Review Letters

|March 5, 2009

Summary

Superconducting current in Josephson junctions with ferromagnetic links directly drives magnetic moments. This interaction creates magnetic precession, influencing the current and causing anomalies near ferromagnetic resonance.

Area of Science:

Condensed matter physics
Quantum phenomena
Magnetism

Background:

Josephson junctions are fundamental superconducting devices.
Noncentrosymmetric ferromagnets exhibit unique spin-dependent properties.
Understanding the interplay between superconductivity and magnetism is crucial.

Purpose of the Study:

To investigate the influence of superconducting current on magnetic dynamics in Josephson junctions.
To explore the feedback mechanism between magnetic precession and superconducting current.
To analyze anomalies in current-phase relations due to magnetic effects.

Main Methods:

Theoretical modeling of a Josephson junction with a noncentrosymmetric ferromagnetic weak link.
Analysis of the ac Josephson effect and its impact on magnetic moments.

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Investigation of magnetic precession and its feedback on the superconducting current.

Main Results:

Superconducting current directly drives magnetic moment precession.
The ac Josephson effect generates a feedback loop influencing the current.
Anomalies in current-phase relations, including second harmonic and dissipative current, are observed.
These anomalies are significantly enhanced near the ferromagnetic resonance frequency.

Conclusions:

The coupling between superconducting current and magnetic moment in these junctions leads to novel phenomena.
The ac Josephson effect provides a route to control and probe magnetic dynamics.
Observed anomalies offer potential for new applications in superconducting spintronics.