16_domaintheory

16_domaintheory - Lesson 16: Domain Theory As mentioned in...

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Lesson 16: Domain Theory As mentioned in the last lesson, there are theories that we should be able to separate magnetic poles from each other, although no one has ever been able to actually do it. Instead, if a bar magnet is cut in half you get two new magnets, each with its own north and south poles. This means that any current theory of magnetism should be able to explain the dipolar nature of magnets. To do this, picture an atom as looking something like Rutherford's Planetary model, the one where electrons orbit the nucleus like little tiny planets around a sun. You can imagine the electrons as spinning around the nucleus, while at the same time spinning around on their own axis (just like the Earth as it goes around the Sun). For reasons that are not entirely understood, this induces a mini magnetic field all of its own. Enough of these individual microscopic magnetic fields add up to act as a domain . Each domain acts as a miniature magnet, with its own north and south poles. In most materials, these domains are random, pointing in all
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This note was uploaded on 12/02/2011 for the course PHYSICS 235 taught by Professor Staff during the Fall '08 term at Rutgers.

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16_domaintheory - Lesson 16: Domain Theory As mentioned in...

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