Magnet Myths and Misconceptions

[tinman]

Tinman:

Good on you for stating the obvious:  There is no Bloch Wall at the center of a magnet.

  You can have situations where there is no attraction felt and there still is a magnetic field present.  It's because the magnetic field is parallel to the magnet and there is no net pull towards either pole on the ferrite or piece of metal. 

MileHigh

A magnetic field that dose not attract metal or ferrite
This is one magical magnetic field you guys have here And it cannot induce magnetic flux into an inductor either-to produce power-->although Mark seems to think it can. Well we will have a look at that next weekend,but now !once again! i must hit the road for a few days.

[MarkE]

We'll see you when you get back.

[synchro1]

@MileHigh,

"Simple Bloch walls separate domains. Their lateral dimensions estimated from neutron scattering experiments agree with micromagnetic simulations".

The Bloch Wall is more then a parallel field and has "Lateral Dimensions" measured by neutron scattering.

Once again the definition"

"A Bloch wall is a narrow transition region at the boundary between magnetic domains, over which the magnetization changes from its value in one domain to that in the next, named after the physicist Felix Bloch".

A NARROW REGION! This area has a width and thickness and has been measured with great accuracy. Below can you see where it measures at 2um from neutron scattering experiments. I can produce volumes of test data to support this fact. MileHigh, MarkE and TinselKoala are three bullshit peas in a pod..

[tinman]

I need one of them ipads for when im on the road ,this phone screen to bloody small.
I have come up with a doozy idea as to how we can see the exact field shape of a PM. This I will do right after theo's free heat generating bismuth do'hicky experiment..I am about 1100km away from my workshop ATM, but should be home by the weekend, when I will whip up a quick demo of the non generating field.
@MarkE
What are the arrows on the field lines supose to represent-the flow of what?

[TinselKoala]

I see you are still doing what you do best, Synchro: Misrepresenting the work of others, that you do not understand.

See if you can find such a photomicrograph that shows a "Bloch Wall" running along the center of a permanent magnet. Then try to explain why, when you cut a PM in half along the center, you get NOT two "monopole" magnets but rather two ordinary bipolar magnets, each with what you wrongly call a "Bloch wall" in their centers. It's a funny kind of "wall" that splits and moves just because you have cut along where you thought it was.

As MH told you earlier, Bloch walls are actually just what your photomicrographs show: Domain boundaries. And he has also told you the truth: In Permanent Magnets, most of the domains are oriented in the _same direction_ , not randomly like the images you have presented. Bloch walls exist between all the tiny magnetic domains that are randomly oriented, not along the "equator" of permanent magnets.

@MileHigh,

"Simple Bloch walls separate domains. Their lateral dimensions estimated from neutron scattering experiments agree with micromagnetic simulations".

The Bloch Wall is more then a parallel field and has "Lateral Dimensions" measured by neutron scattering.

Once again the definition"

"A Bloch wall is a narrow transition region at the boundary between magnetic domains, over which the magnetization changes from its value in one domain to that in the next, named after the physicist Felix Bloch".

A NARROW REGION! This area has a width and thickness and has been measured with great accuracy. Below can you see where it measures at 2um from neutron scattering experiments. I can produce volumes of test data to support this fact. MileHigh, MarkE and TinselKoala are three bullshit peas in a pod..