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Magnetic field enhanced nano-tip fabrication for four-probe STM studies
J E McKendry1, C S Allen, K Critchley
1School of Physics and Astronomy, University of Leeds, West Yorkshire, UK.
Nanotechnology
|July 7, 2011
Summary
We improved tungsten scanning tunneling microscope (STM) tip fabrication using a magnetic field. This method reduces bubble adhesion and tip cone angle, enabling closer proximity for multiprobe measurements.
Area of Science:
- Materials Science
- Nanotechnology
- Surface Science
Background:
- Scanning tunneling microscopy (STM) is crucial for nanoscale measurements.
- Fabricating high-quality STM tips is essential for precise measurements.
- Multiprobe STM requires tips that can be brought into close proximity.
Purpose of the Study:
- To develop an improved method for fabricating tungsten STM tips.
- To enhance tip performance for multiprobe STM applications.
- To investigate the effect of magnetic fields on tip fabrication.
Main Methods:
- Utilized a 'drop-off' technique for tungsten tip fabrication.
- Applied a magnetic field during the tip etching process.
- Investigated the influence of magnetic field strength (above 150 Oe) on electrolyte behavior.
Main Results:
- Observed electrolyte rotation around the tungsten anode in a magnetic field.
- Reduced bubble adhesion to the tip during fabrication.
- Achieved a reduced cone angle for the fabricated tungsten STM tips.
Conclusions:
- The magnetic field-assisted fabrication method improves tungsten STM tip quality.
- Reduced cone angles facilitate bringing multiple tips into close proximity for multiprobe STM.
- This technique is advantageous for advanced nanoscale measurements.
