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Author Topic: one of the magnetic properties  (Read 2618 times)

Offline iolantham

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one of the magnetic properties
« on: 30/06/2007 02:05:47 »
Hello everyone :D!

I would like to ask you whether you have a handbook or a reference book with the magnetization saturation, Ms, or the magnetic moment,m, per particle for iron(or iron oxide). I've looked those values up, but the best I could find was Ms=501 A/m. As a clue, the magnetic moment should be in A m2.
Thanks a lot for your help and enjoy the weekend!


 

Offline Soul Surfer

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one of the magnetic properties
« Reply #1 on: 30/06/2007 08:44:31 »
The magnetic moment of a particle depends on its size and shape.  Shape is particularly important long thin things magnetised along their longest asis have a much bigger magnetic moment than round blobs so you have to specify the size shape and material before you can calculate that.
 

Offline iolantham

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one of the magnetic properties
« Reply #2 on: 02/07/2007 15:08:28 »
The iron (or iron oxide if you can't find data for iron) nanoparticles are 8 nm in diameter and they're round.

All the best,
Monica
 

Offline safertr

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one of the magnetic properties
« Reply #3 on: 05/07/2007 15:01:30 »
Saturation magnetization is the amount of magnetic field that a magnet can produce. Strong magnets have higher saturation.
newbielink:http://www.click2finding.com/click2.aspx?pr=Science/Physics/Particle/ [nonactive]
he spontaneous magnetization is the net magnetization that exists inside a uniformly magnetized microscopic volume in the absence of a field. The magnitude of this magnetization, at 0 K, is dependent on the spin magnetic moments of electrons.

A related term is the saturation magnetization which we can measure in the laboratory. The saturation magnetization is the maximum induced magnetic moment that can be obtained in a magnetic field (Hsat); beyond this field no further increase in magnetization occurs.
newbielink:http://www.irm.umn.edu/hg2m/hg2m_b/hg2m_b.html [nonactive]
The difference between spontaneous magnetization and the saturation magnetization has to do with magnetic domains (more about domains later). Saturation magnetization is an intrinsic property, independent of particle size but dependent on temperature.

There is a big difference between paramagnetic and ferromagnetic susceptibility. As compared to paramagnetic materials, the magnetization in ferromagnetic materials is saturated in moderate magnetic fields and at high (room-temperature) temperatures
 

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one of the magnetic properties
« Reply #3 on: 05/07/2007 15:01:30 »

 

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