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

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. This...

You might also read

Related Articles

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

Sort by

Same author

Observation of a Charmed Baryon Decaying to D;{0}p at a Mass Near 2.94 GeV/c;{2}.

Physical review letters·2007

Same author

Observation of CP violation in B --> eta'K0 decays.

Physical review letters·2007

Same author

Observation of time-dependent CP violation in B0 --> eta'K0 decays and improved measurements of CP asymmetries in B0 --> phiK0, KS0KS0KS0 and B0 --> J/psiK0 decays.

Physical review letters·2007

Same author

Vector-tensor and vector-vector decay amplitude analysis of B0-->phiK*0.

Physical review letters·2007

Same author

Observation of B-->eta'K* and evidence for B+-->eta'rho+.

Physical review letters·2007

Same author

Measurement of the CP asymmetry and branching fraction of B0-->rho0K0.

Physical review letters·2007

Search research articles

Related Experiment Video

Updated: May 29, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

Regulating Brownian fluctuations with tunable microscopic magnetic traps.

A Chen¹, G Vieira, T Henighan

¹Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA.

Physical Review Letters

|September 21, 2011

Summary

Researchers developed a magnetic trap to control the movement of tiny superparamagnetic beads in liquid. This innovation helps manage their random thermal motion, enabling precise manipulation for various applications.

More Related Videos

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

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

Published on: May 12, 2023

Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps

Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps

Published on: August 17, 2017

Related Experiment Videos

Last Updated: May 29, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

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

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

Published on: May 12, 2023

Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps

Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps

Published on: August 17, 2017

Area of Science:

Physics
Materials Science
Nanotechnology

Background:

Controlling the position of submicron particles in fluids is difficult due to Brownian motion.
Superparamagnetic beads are useful for various applications but their random movement poses challenges.

Purpose of the Study:

To present a novel magnetic-field-based trap for regulating Brownian fluctuations of superparamagnetic beads.
To demonstrate tunable control over particle trajectories within the trap.

Main Methods:

Utilizing local domain-wall magnetic fields generated by patterned magnetic wires.
Tuning magnetic field strength and profile with weak external fields.
Observing and simulating the trajectories of superparamagnetic beads in the trap.

Main Results:

Successfully regulated thermal fluctuations of superparamagnetic beads in suspension.
Achieved tunable control, varying bead confinement from strong localization to delocalized excursions.
Experimental results were well-described by simulation models.

Conclusions:

The magnetic trap offers effective control over Brownian motion for submicron particles.
This method provides a versatile platform for manipulating micro- and nanoparticles.
The findings have implications for microfluidics, biophysics, and nanotechnology.