Nanoparticle manipulation with a carbon fiber tip in an electron microscope forμ-SQUID magnetometry

Area of Science:

• Materials Science
• Nanotechnology
• Physics

Background:

• Precise manipulation of individual nanoparticles (NPs) is crucial for fabricating advanced nanodevices.
• Existing methods often face challenges with adhesion forces and positioning accuracy.

Purpose of the Study:

• To develop and demonstrate a nanomanipulation system for precise control of individual nanoparticles.
• To integrate this system with a scanning electron microscope (SEM) for real-time visualization and manipulation.

Main Methods:

• Utilized electrochemically etched amorphous carbon fiber tips with sub-100 nm apex radii for reduced van der Waals adhesion.
• Integrated a piezoelectric bimorph for vertical motion, a four-quadrant piezo-tube for 2D fine control, and a piezoelectric walker for coarse lateral translation.
• Employed a scanning electron microscope for high-resolution imaging and guidance during manipulation.

Main Results:

• Achieved reliable positioning of approximately 100 nm size NPs with approximately 100 nm precision.
• Successfully positioned single Fe3O4 magnetic NPs onto micron-sized superconducting quantum interference devices (SQUIDs).
• Demonstrated the ability to probe nanoparticle magnetism after precise placement.

Conclusions:

• The developed carbon-fiber-tip based nanomanipulation system offers high precision for individual NP manipulation.
• This technique facilitates optimal magnetic coupling between NPs and SQUIDs, enabling advanced magnetic studies.
• The system shows potential for fabricating nanoscale devices and exploring nanoparticle properties.