Chapter Eleven Diamagnetism and Paramagn

Chapter Eleven

Diamagnetism and Paramagnetism

The story of magnetism begins with a mineral called magnetite “Fe3O4”.
The first truly scientific study of magnetism was made by William Gilbert.
His book “On the magnet” was published in 1600.
In 1820 Hans Christian Oersted discovered that
an electric current produces a magnetic field.
In 1825 the first electromagnet was made by Sturgeon.

Each stores the same
magnetic energy ~0.4J.
1

ferromagnetism

diamagnetism

M (emu/cm3)

M (emu/cm3)

paramagnetism

H (Oe)

H (Oe)

Magnetic susceptibility per unit volume

M
χ≡
H

M : magnetization, magnetic moment per unit volume
B : macroscopic magnetic field intensity

CGS

In general, paramagnetic material has a positive susceptibility (χ >0).

diamagnetic material has a negative susceptibility (χ

Chapter Eleven Diamagnetism and Paramagn

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