Spin-orbital coupling in a triplet superconductor-ferromagnet junction

Area of Science:

• Condensed matter physics
• Superconductivity
• Spintronics

Background:

• Triplet superconductors exhibit complex electronic behaviors.
• Ferromagnet-superconductor interfaces are crucial for spintronic devices.
• Understanding spin-orbital coupling is key to novel quantum phenomena.

Purpose of the Study:

• To investigate the interplay of spin and orbital degrees of freedom in a triplet superconductor-ferromagnet junction.
• To determine how the relative orientation of magnetization and triplet order parameter affects the superconducting gap.
• To explore the emergence of preferred magnetization orientations due to orbital effects.

Main Methods:

• Self-consistent, spatially dependent mean-field theory.
• Analysis of p-wave gap modulation near the interface.
• Calculation of condensation energy to determine magnetic orientation preferences.

Main Results:

• The p-wave gap is enhanced or suppressed based on the angle between the ferromagnetic moment and the triplet vector order parameter.
• The gap's behavior depends on whether antinodes are parallel or perpendicular to the boundary.
• An orbitally dependent preferred magnetization orientation is established.
• First-order transitions in moment orientation occur in chiral superconductors with increasing exchange field strength.

Conclusions:

• The orientation of magnetization plays a critical role in modulating superconductivity at the interface.
• Orbital degrees of freedom dictate preferred magnetization alignments.
• Chiral superconductors exhibit distinct magnetic switching behaviors driven by exchange fields.