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Cryogenic Liquid Jets for High Repetition Rate Discovery Science

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Published on: May 9, 2020

Cryogenic current-in-plane tunneling apparatus.

Nicolas Weiss¹, Ute Drechsler, Michel Despont

¹IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120-6099, USA.

The Review of Scientific Instruments

|January 7, 2009

Summary

We developed a new cryogenic apparatus to precisely measure magnetoresistance in magnetic tunnel junction wafers across a wide temperature range. This tool enables detailed analysis of magnetic properties for advanced materials research.

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Area of Science:

Materials Science
Condensed Matter Physics
Electrical Engineering

Background:

Magnetic tunnel junctions (MTJs) are crucial for spintronic devices.
Characterizing MTJ wafer properties at variable temperatures is essential for device optimization.
Existing measurement techniques may lack the precision or temperature range required.

Purpose of the Study:

To design and fabricate a novel cryogenic variable-temperature current-in-plane tunneling apparatus.
To enable precise measurement of magnetoresistive properties in unpatterned MTJ wafers.
To facilitate temperature-dependent characterization from 7 K to 330 K.

Main Methods:

Fabrication of a micromachined silicon probe head with 20 measuring and 4 leveling probes.
Integration of the probe head with a liquid helium continuous flow cryostat for temperature control.
Utilizing a nonmagnetic x-y stage for precise sample positioning and probe approach.

Main Results:

Successful design and fabrication of the cryogenic tunneling apparatus.
Demonstration of measurements at both room temperature and cryogenic temperatures.
Characterization of probe dimensions, pitch variation, and stage repeatability.

Conclusions:

The developed apparatus provides a versatile platform for temperature-dependent magnetoresistance measurements.
The micromachined probe head design allows for precise contact with MTJ wafers.
This tool is suitable for detailed analysis of magnetic tunnel junction wafer properties.