Drag Voltages in a Superconductor/Insulator/Ferromagnet Trilayer

Area of Science:

• Condensed matter physics
• Materials science
• Superconductivity and magnetism

Background:

• Investigating interactions between spatially separated systems at cryogenic temperatures is crucial for understanding unconventional physical effects.
• Multilayered systems integrating superconducting and ferromagnetic materials offer a unique platform for such studies.

Purpose of the Study:

• To investigate drag transverse voltage effects in superconductor/insulator/ferromagnet (S/I/F) trilayers.
• To analyze superconductor/ferromagnet (S/F) and superconductor/normal metal (S/N) bilayers for comparative insights.

Main Methods:

• Fabrication of S/I/F trilayer and S/F, S/N bilayer samples in a cross-wire geometry.
• Measurement of current-voltage (I-V) characteristics at a cryogenic temperature of 4.2 K.
• Application of a perpendicular magnetic field during measurements.

Main Results:

• Observed significant peculiarities in the I-V characteristics of the multilayered systems.
• These peculiarities are attributed to the interaction effects between the superconducting, insulating, and ferromagnetic layers.
• Comparative analysis of trilayer and bilayer structures provided insights into the layer-specific contributions.

Conclusions:

• The study demonstrates the presence of drag transverse voltage effects in superconductor-ferromagnet multilayered systems.
• These effects are a direct consequence of the interaction between adjacent superconducting and ferromagnetic materials.
• The findings contribute to the understanding of unconventional phenomena in hybrid material systems at low temperatures.