Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Magnetic Fields

Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...

Atomic Nuclei: Nuclear Relaxation Processes

Atomic Nuclei: Nuclear Relaxation Processes

In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis.

Magnetic Damping

Magnetic Damping

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...

Diamagnetism

Diamagnetism

Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....

Paramagnetism

Paramagnetism

Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...

Atomic Nuclei: Nuclear Magnetic Moment

Atomic Nuclei: Nuclear Magnetic Moment

All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

An Energy Detection Algorithm with Clustering-Based False Alarm Suppression for Magnetic Anomaly Detection.

Sensors (Basel, Switzerland)·2026

Same author

Rapid atomic-signal-based in-situ magnetic compensation for unshielded spin-exchange relaxation-free atomic magnetometer.

The Review of scientific instruments·2026

Same author

In situ monitoring system for manufacturing atomic vapor cells with anti-relaxation coatings.

The Review of scientific instruments·2026

Same author

Mechanism of the AC-Light-Shift-Induced Phase Shift and a DC Compensation Strategy in Bell-Bloom Magnetometers.

Sensors (Basel, Switzerland)·2025

Same author

Crosstalk reduction in optically pumped magnetometers arrays for biomagnetic measurement.

The Review of scientific instruments·2025

Same author

Time-frequency transfer over optical fiber.

National science review·2025

Search research articles

Related Experiment Video

Updated: Dec 13, 2025

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

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

Published on: July 20, 2022

Active Magnetic-Field Stabilization with Atomic Magnetometer.

Rui Zhang^1,2, Yudong Ding², Yucheng Yang²

¹College of Liberal Arts and Sciences, and Interdisciplinary Center for Quantum Information, National University of Defense Technology, Changsha 410073, China.

Sensors (Basel, Switzerland)

|August 6, 2020

Summary

This summary is machine-generated.

Active magnetic stabilization, using magnetometers to cancel noise, achieves over 800x noise reduction. This enables sensitive magnetic field detection even in unshielded environments.

Keywords:

magnetic field stabilization optically pumped magnetometers unshielded

More Related Videos

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement

Published on: November 7, 2017

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons

Published on: July 14, 2021

Related Experiment Videos

Last Updated: Dec 13, 2025

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

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

Published on: July 20, 2022

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement

Published on: November 7, 2017

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons

Published on: July 14, 2021

Area of Science:

Physics
Instrumentation
Geophysics

Background:

Detecting faint magnetic signals requires magnetically quiet environments.
Passive magnetic shielding is common but has limitations.
Active magnetic field stabilization offers a complementary approach.

Purpose of the Study:

To present a general model for active magnetic-field stabilization.
To quantitatively optimize the performance of active stabilization systems.
To experimentally validate the model using atomic magnetometers.

Main Methods:

Developed a general quantitative model for active magnetic-field stabilization.
Employed optically-pumped atomic magnetometers for experimental verification.
Measured magnetic-field noise rejection and noise floor.

Main Results:

Demonstrated a magnetic-field noise rejection ratio exceeding 800 at low frequencies.
Achieved a magnetic-field noise floor of approximately 40 fT/Hz^1/2 in an unshielded environment.
Validated the proposed model's effectiveness in analyzing and improving active stabilization.

Conclusions:

The developed model provides guidance for enhancing active magnetic-field stabilization.
Active stabilization is a viable method for sensitive magnetic detection in natural environments.
This technique broadens possibilities for detecting weak magnetic signals without extensive shielding.