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Galvanometer

Galvanometer

Common devices, including car instrument panels, battery chargers, and inexpensive electrical instruments, measure potential difference (voltage), current, or resistance using a d'Arsonval galvanometer. This electromechanical instrument is also known as a moving coil galvanometer.
The galvanometer consists of two concave-shaped permanent magnets, providing a uniform radial magnetic field in the annular region. In the center, a pivoted coil of fine copper wire is placed in the uniform magnetic...

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Related Experiment Video

Updated: Jun 17, 2026

Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials

Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials

Published on: January 21, 2016

Tunable nanoscale graphene magnetometers.

Simone Pisana¹, Patrick M Braganca, Ernesto E Marinero

¹San Jose Research Center, Hitachi Global Storage Technologies, 3403 Yerba Buena Road, San Jose, California 95135, USA.

|December 25, 2009

Summary

This summary is machine-generated.

Graphene extraordinary magnetoresistance devices offer high sensitivity for nanoscale magnetic field detection. This breakthrough overcomes limitations of current technologies, enabling advanced applications in biosensing and data storage.

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Area of Science:

Physics
Materials Science
Nanotechnology

Background:

Nanoscale magnetic field detection is crucial for applications like scanning probe magnetometry, biosensing, and magnetic storage.
Existing technologies (giant magnetoresistance, tunneling magnetoresistance) face limitations due to thermal magnetic noise and spin-torque instability at small scales.
Conventional Hall sensors, while not affected by these issues, suffer from limited spatial resolution and sensitivity due to magnetic flux loss.

Purpose of the Study:

To develop a novel sensor technology for high-resolution magnetic field detection.
To overcome the limitations of existing magnetoresistive and Hall effect sensors at the nanoscale.
To leverage graphene's unique properties for enhanced magnetic sensing capabilities.

Main Methods:

Fabrication of graphene extraordinary magnetoresistance devices.
Integration of Hall effect and enhanced geometric magnetoresistance principles.
Utilizing back-gating for tunable sensor characteristics.

Main Results:

Demonstrated graphene devices with sensitivities comparable to state-of-the-art sensors.
Achieved subnanometer sense layer thickness at the sensor surface.
Showcased the ability to control sensor characteristics via back-gating to mitigate variability.

Conclusions:

Graphene extraordinary magnetoresistance sensors offer a promising solution for high-sensitivity, nanoscale magnetic field detection.
The developed technology surpasses limitations of current sensors, paving the way for improved biosensing and data storage.
Back-gating provides a method to enhance device reliability and performance by controlling material and fabrication variations.