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Torque On A Current Loop In A Magnetic Field

Torque On A Current Loop In A Magnetic Field

The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...

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High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

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Assembling Magnetic Nanoparticles on Nanomechanical Resonators for Torque Magnetometry.

Tayyaba Firdous^1,2, David K Potter¹

¹Department of Physics, University of Alberta, Edmonton, AB T6G 2E1, Canada.

International Journal of Molecular Sciences

|February 7, 2020

Summary

We developed a new method to pattern nanoparticle arrays on nanomechanical devices. This technique successfully created functional nanomechanical torque magnetometers with self-assembled nanoparticle arrays.

Keywords:

magnetic nanoparticles nanomechanical resonators self-assembly stable single domain particles superparamagnetic torque magnetometry

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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

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Area of Science:

Nanotechnology
Materials Science
Mechanical Engineering

Background:

Micro- and nanomechanical devices require precise patterning of functional materials.
Existing nanoparticle patterning methods can be complex and lack versatility.

Purpose of the Study:

To report a highly compliant process for patterning nanoparticle arrays on micro- and nanomechanical devices.
To demonstrate this process using nanomechanical torque magnetometers.

Main Methods:

Fabrication of nanomechanical devices on silicon-on-insulator substrates.
Single-layer self-assembly of nanoparticles onto released nanomechanical devices.
Utilizing a hybrid top-down and bottom-up approach for nanoparticle arrangement.

Main Results:

Successfully fabricated sizable arrays of nanomechanical devices.
Demonstrated self-assembly of nanoparticles into specific geometrical shapes.
Achieved detection of magnetic torque signals using the fabricated devices.

Conclusions:

The developed nanoparticle patterning process is highly compliant and versatile.
This method enables the creation of functional nanomechanical sensors.
The process is applicable to various nanoparticle types and device geometries.