magnetic domain वाक्य

Early theories of magnetization in ferromagnets assumed that ferromagnets are divided into magnetic domains and that the magnetization changed by the movement of domain walls.
In a ferromagnet for instance, solid iron the magnetic moment on each atom is aligned in the same direction ( within a magnetic domain ).
Paramagnetic and diamagnetic materials, in which the dipoles align in response to an external field but do not spontaneously align, do not have magnetic domains.
The mixed cases are possible as well when demagnetization field changes the magnetic domains ( magnetization direction in domains ) but not the domain walls.
When cooled below a temperature called the Curie temperature, the magnetization of a piece of ferromagnetic material spontaneously divides into many small regions called magnetic domains.

Some magnets, such as many fridge magnets, often contain alternating magnetic domains with the intent that the field should decay even faster than the cube law.
You can think of a magnet as the sum of lots of little magnetic domains, which may only be a few microns or smaller in size.
Is it just like a permanent iron bar magnet with magnetic domains locked in alignment ?-- talk ) 19 : 30, 9 November 2009 ( UTC)
Although this phenomenon may be exploited to study the magnetic domains of materials by " Lorentz force microscopy ", it may make crystal structure determination virtually impossible.
His most esoteric discovery, with Jose Baruchel of ILL and ESRF in Grenoble, France, is the existence of helical or chirality magnetic domains in certain antiferromagnetic materials.