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Friday, 4 November 2016

THE HYSTERESIS LOOP AND MAGNETIC PROPERTIES.

A great deal of information can be learned about the magnetic properties of a materials by studying it's hysteresis loop. A hysteresis loop shows the relationship between the induced magnetic flux density (B) and the magnetizing force (H). It is often referred to as the B-H loop.
The loop is generated by measuring the magnetic flux of a ferromagnetic material while the magnetizing force is changed. A ferromagnetic material that has never been previously magnetized or has been throughly demagnetized will follow the dashed line as H is increased. As the line demonstrates the greater the amount of current applied (H+), the stronger the magnetic field in the component ((B+). At point  "a" almost all of the magnetic Domains are aligned andante additional increase in the magnetizing force will produce very little increase in magnetic flux. The material has reached the point of magnetic saturation. When H is reduced to zero, the curve will move from point "a" to point "b" At this point, it can ne seen that some magnetic flux remains in the material even though the magnetizing force is zero. This is referred to as the point of retentive on the graph and indicates the remanence or level of residual magnetism in the material. (Some of the magnetic domains remain aligned but some have lost their alignment)  As the magnetizing force is reversed, the curve moves to point "c" where the flux has been reduced zero.This is Allen the point of coercivity on the curve.( The revised magnetizing force has flipped enough of the domains so that the net flux within the material is zero.)  The force required to remove the residual magnetism from the material is called the coercive force or coercivity of the material.