Deeper Understanding Of The Magnetic Behavior Of Nanoparticles

This study providing a deeper understanding of the magnetic behavior of nanoparticles; but magnetic nanoparticles can serve as tiny actuators, magnetically pushing and pulling other small objects; on employing the nanoparticles to clean up chemical spills and assemble and operate nanorobotic systems.

Because of the fast method; economical and it does not require special conditions measurements that can occur at room temperature and under atmospheric pressure; or even in liquids it providing the manufacturers with a practical way to measure; but also improve their control of the properties of magnetic nanoparticles for a host of medical and environmental applications.

Magnetic Behavior Of Nanoparticles

By individual magnetic nanoparticles generate magnetic fields like the north and south poles of familiar bar magnets; but these fields create magnetic bubbles flat circles with initial diameters less than 100 nanometers on the surface of a magnetically sensitive film developed at NIST.

The bubbles surround the nanoparticle pole that points opposite to the direction of the magnetic field of the film. Although they encode information about the magnetic orientation of the nanoparticles; the tiny bubbles are not easily detected with an optical microscope.But however, like bubbles in champagne; the magnetic bubbles can be expanding to hundreds of times their initial diameter.

Optical microscope

By applying a small external magnetic field, the team enlarged the diameter of the bubbles to tens of micrometers big enough to see with an optical microscope; the brighter signal of the enlarging bubbles rapidly revealing the magnetic orientation of individual nanoparticles.

Each magnetic bubble reveals the orientation of the magnetic field of a nanoparticle at the instant that the bubble forming; for studying the orientation varrying with time; the researchers generated thousands of new bubbles every second; ongoing effort at NIST to make devices that improve the measurement capabilities of optical microscopes; an instrument available in most labs. This enables rapid measurement of the properties of single nanoparticles for both fundamental research and for nanoparticle manufacturing.