Spin dynamics in superconductor/ferromagnetic insulator hybrid structures with precessing magnetization

Area of Science:

• Condensed Matter Physics
• Spintronics
• Superconductivity

Background:

• Understanding spin dynamics at interfaces between different material types is crucial for advanced electronic devices.
• Superconducting spintronics leverages the unique properties of superconductors for spin manipulation.

Purpose of the Study:

• To investigate the dynamics of spin current and induced magnetization in a superconducting film (S) adjacent to a ferromagnetic insulator (FI).
• To analyze these phenomena both at the interface and within the superconducting film of the S/FI hybrid structure.

Main Methods:

• Theoretical modeling of spin current and magnetization dynamics.
• Analysis of the S/FI hybrid structure interface and the bulk of the superconducting film.

Main Results:

• Predicted a novel frequency dependence of induced magnetization in the superconductor, exhibiting a peak at elevated temperatures.
• Demonstrated that increasing magnetization precession frequency significantly alters the spin distribution of quasiparticles at the S/FI interface.

Conclusions:

• The findings reveal a temperature- and frequency-dependent interplay between superconductivity and magnetism.
• This work offers insights into controlling spin properties in hybrid superconductor-ferromagnet systems for potential applications.