Short answer for magnetic permability and ferromagnetism lab. Fe cubes were stuc

Question

Short answer for magnetic permability and ferromagnetism lab. Fe cubes were stuck into a solenoid, and there were changes to the permeability relating to when there were one, two or three cubes present.

1) What is the effect of changing the number of Fe cubes in the solenoid? Why do you suppose this change occurs?

2) What is the effect of changing the sample material? Compare your results using book values for permeability of Fe and Cr. Do the results make sense? If not, speculate as to why.

3*) How would you need to place a coil in a ferromagnetic material to have the resultant field created be exactly that given by the equations listed in this lab? *Related to the geometry

Explanation / Answer

the term ferromagnetism was used for any material that could exhibit spontaneous magnetization: a net magnetic moment in the absence of an external magnetic field. This general definition is still in common use. More recently, however, different classes of spontaneous magnetization have been identified when there is more than one magnetic ion per primitive cell of the material, leading to a stricter definition of "ferromagnetism" that is often used to distinguish it from ferrimagnetism. In particular,

These alignment effects only occur at temperatures below a certain critical temperature, called the Curie temperature (for ferromagnets and ferrimagnets) or the Néel temperature (for antiferromagnets).

Among the first investigations of ferromagnetism are the pioneering works of Aleksandr Stoletov on measurement of the magnetic permeability of ferromagnetics, known as the Stoletov curve.

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