Lect_19_note

Lect_19_note - Chapter 30-3 Sources of the Magnetic Field Classification of Magnetic Substances Diamagnetic Ferromagnetic Paramagnetic Diamagnetism

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Chapter 30 -3 Sources of the Magnetic Field
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Substances ± Diamagnetic ± Ferromagnetic ± Paramagnetic
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Diamagnetism ± When an external magnetic field is applied to a diamagnetic substance, a weak magnetic moment is induced in the direction opposite the applied field ± Diamagnetic substances are weakly repelled by a magnet
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Diamagnetism ± All materials, except Helium, show a diamagnetic response in an applied magnetic field. ± Materials that are said to be diamagnetic are those which are usually considered by non-physicists as "non magnetic", and include water, DNA, most organic compounds, and many metals including copper, mercury and gold.
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Ferromagnetic Materials ± They contain permanent atomic magnetic moments that tend to align parallel to each other in an external magnetic field ± Even when the external magnetic field is removed, the parallel alignment of the magnetic moments remains.
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Ferromagnetic Materials ± Some examples of ferromagnetic materials are: ± iron ± cobalt ± nickel ± gadolinium
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This note was uploaded on 01/28/2011 for the course PHYS 011 taught by Professor Nianlin during the Fall '08 term at HKUST.

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Lect_19_note - Chapter 30-3 Sources of the Magnetic Field Classification of Magnetic Substances Diamagnetic Ferromagnetic Paramagnetic Diamagnetism

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