I need to know if it is possible to make a singular linear magnetic field from nano-magnets. Here's a picture of what I am talking about. By the way I crossed out all of the fields I don't need in the picture represented by arrows with lines going through them.

Wrong link here's the picture:

By the way that is suppose to be the end of one of the magnet's poles, not a side view of the manget.

kc, the picture doesn't appear on my browser -- I just get the little 'placeholder' box. so I can't tell for sure what you're interested in making.

I found this by googling 'nanomanget':

quote:

Conventional magnets act like collections of tiny bar magnets that line up into spirals, due to what scientists call magnetostatic interaction. That means the magnetic poles in a conventional magnet end up pointing in all directions.

At the distance of about 10 nanometers or less, however, the esoterically named quantum mechanical exchange interaction dominates, so each tiny bar magnet lines up in rows. The magnetic poles in nanomagnets end up pointing in the same direction...The fact nanomagnets can have their magnetic poles all point the same way helps make hard disks possible...

Data storage applications count for more than 90 percent of today's nanomagnet market, roughly $4 billion in 2004...In comparison, biotechnology and industrial products make up less than 10 percent of the nanomagnet market.

"Nanoscale objects can permeate biostructures. For example, you can inject suspensions of magnetic nanoparticles into a bloodstream, and have them go through without clogging up vessels. Depending on their size, they can even diffuse through the walls of the vessels as well"

Quotes within the quote are from physicist Denis Koltsov at Lancaster University in Britain.

I find this an interesting topic.

I'm not sure what you mean by "singular linear" field. If you lined up a lot of bar magnets between, and perpendicular to, two parallel planes (where the spacing between the planes is small compared to their size) the resulting magnetic field would behave like a sheet of paper with north on one side and south on the other, analogous to the electric field between the parallel plates of a capacitor. This ignores more complicated effects at the edges.

If by 'singular' you're referring to a magnetic monopole, an isolated north pole or south pole without its opposite anywhere around, it is classically forbidden and no such thing has ever been found. (This is quite different from electric fields, which do emanate from particles with point-like positive or negative charges.) If you cut a bar magnet halfway between N and S you get two new N-S bar magnets. Keep cutting and the result is the same, in endless regress -- like the water-carrying brooms in Fantasia .

There are superstring theories that postulate a magnetic monopole, which for some reason is predicted to be very heavy -- if it exists.

quote:

The magnetic poles in nanomagnets end up pointing in the same direction...

Is it possible to get a visual picture of that? I am still not clear what that means.

Imagine that people are bar magnets. Our heads are the north pole and our feet are the south pole.

Gather a huge crowd of people to all huddle together, standing up, in a large, flat parking lot. If you look down on them from a very high place, all you can see is a mass of heads about two meters off the pavement, which is a mass of feet. That makes the pavement like a sheet of south pole and, two meters above, heads bobbing in a sheet of north pole.

So with nanomagnets the spacing is just a few nanometers, rather than two meters.

So your saying the space between the poles are nanos, but I still don't get a visual picture of the magnetic field emanating from these nanomagets. I need to know how their fields behave at that size.

ok, I just saw your diagram. I think this is consistent with what I've said. They show N & S pointing opposite (as expected) but with no in-between directions for the field. I'm not sure if this is a classical effect, owing to the special geometry of the field, whereby the field lines not perpendicular to the sheet are weak compared to the surface fields; or if this is some kind of quantum effect, whereby field directions not perpendicular to the sheet are actually zero. What's confusing is that the diagram shows a central square where I would envision a very tall and skinny rectangle.

It's the top of the magnet showing only the top of one of the poles. It's not a side view of the magnet.