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Biasing of Metal-Semiconductor Junctions

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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Metal-Semiconductor Junctions

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Anomalous Supercurrent Modulation in Josephson Junctions With Ni-Based Barriers.

Burm Baek¹, Michael L Schneider¹, Matthew R Pufall¹

¹National Institute of Standards and Technology, Boulder, CO 80305 USA.

IEEE Transactions on Applied Superconductivity : a Publication of the IEEE Superconductivity Committee

|March 27, 2025

Summary

This summary is machine-generated.

We studied magnetic Josephson junctions with nickel barriers, observing oscillatory critical current. Anomalous features suggest unique microscopic transport effects in these magnetic devices.

Keywords:

Josephson effect Josephson junctions (JJs)magnetic devices superconducting devices

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Area of Science:

Condensed Matter Physics
Superconductivity
Spintronics

Background:

Josephson junctions are fundamental superconducting devices.
Magnetic Josephson junctions offer unique properties due to the exchange field.
Understanding transport in magnetic Josephson junctions is crucial for spintronic applications.

Purpose of the Study:

To investigate supercurrent transport characteristics in Ni-barrier Josephson junctions.
To analyze the influence of multilayer barrier structures on junction properties.
To explore anomalous features in magnetic Josephson junctions.

Main Methods:

Fabrication of Josephson junctions with varying nickel barrier multilayer structures.
Magneto-electrical measurements for detailed characterization.
Analysis of critical current oscillations and current-phase relationships.

Main Results:

Observed oscillatory critical current as a function of Ni thickness, largely matching clean-limit theory.
Identified anomalous features: phase shift due to nonmagnetic spacer, near-zero magnetic dead layer, and distorted current-phase relationship near the 0-π transition.
These results highlight the complex interplay of exchange fields and superconducting spin modulation.

Conclusions:

The study reveals unique microscopic transport phenomena in magnetic Josephson junctions.
Findings provide insights into the role of the exchange field in superconducting spin modulation.
A path towards a comprehensive understanding of realistic magnetic Josephson junctions is discussed.