ESSAY ASSIGNMENT Domains and hysteresis (Use footnotes for citing references, bo
ID: 1770217 • Letter: E
Question
ESSAY ASSIGNMENT Domains and hysteresis (Use footnotes for citing references, book page numbers or web addresses) Fig. 2 shows the appearance of a temporary (soft) magnetic material under a magnetic-force microscope (MMF), which detects the directions of the magnetic field in the areas under observation. The situa depicted is much like that in the paper clips, many little magnetic domains arranged so chaotically that their net magnetic field is just about zero. But when a magnetic field is applied from outside, from a permanent (hard) bar magnet, for example, the domain walls are able to shift enough that the magnetic directions line up. talo Write a report explaining: 1. how these facts explain your paper clip observations 2. why a temporary magnetic material can be made more permanent by methods that harden the material physically. 3. what hysteresis is and how the existence of domain alignment explains it. :7Explanation / Answer
Answer1
In many materials, aroms are arranged in such a way that the net magnetic moment is zero. This is because of the random orientation of atoms such that each one can cancels out the other thus resulting is zero or very little net magnetization. This can be compared to randomly orieented paper clips which have zero net magnetization.
But in some materials such ferromagnetic materials, atoms are grouped together in 'domains' which have non zero net magnetization. Under the action of an exteral magnetic field, all the domains align themselves in the same direction as that of the external field and the material itself becomes a permanent magnet or at least as temporary net magnetization.
This is also the same with paper clips, under the action of an external magnetic field, all the clips align themselves in one direction and have a net magnetization. But this is only present till the external magnetic field is applied.
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