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Published on: August 2, 2019
Dynamic magnetoelectric effect in ferromagnet/superconductor tunnel junctions.
Mircea Trif1, Yaroslav Tserkovnyak
1Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA.
Physical Review Letters
|September 10, 2013
Summary
We investigated magnetization dynamics in ferromagnet/insulator/superconductor junctions. Superconducting correlations significantly enhance induced electrical polarization, peaking when frequencies match the superconducting gap.
Area of Science:
- Condensed matter physics
- Spintronics
- Superconductivity
Background:
- Ferromagnet/insulator/superconductor (FI S) tunnel junctions are key for spintronic devices.
- Understanding magnetization dynamics is crucial for novel electronic applications.
Purpose of the Study:
- To investigate magnetization dynamics in FI S tunnel junctions.
- To analyze the buildup of electrical polarization.
- To explore the influence of superconducting correlations on this phenomenon.
Main Methods:
- Theoretical study of magnetization dynamics.
- Analysis of electrical polarization in open-circuit conditions.
- Examination of frequency dependence relative to superconducting gap.
Main Results:
- Induced voltage shows strong, nonmonotonic dependence on precessional frequency.
- Superconducting correlations significantly enhance electrical polarization.
- Voltage peaks when driving frequency is comparable to the superconducting gap, dropping to zero otherwise.
Conclusions:
- The observed effect offers potential for low-temperature spectroscopy of magnetic dynamics.
- FI S junctions exhibit tunable electrical polarization based on magnetic and superconducting properties.
- This research contributes to the development of advanced spintronic devices.
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