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377b - — — I Below magnetic saturation the...

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Unformatted text preview: —+— I Below magnetic saturation the susceptibility of paramagnetic substances to magnetization by an external magnetic field obeys Curie's law: M = magnetization M-Ci C = Curic's otmstant _ H - entomnlm netin finld so‘en th T 13 E T = lemperaturn The magnetization is directly proportional to the applied field and inversely proportional to the temperature. Higher temperature tends to randomize the dipole orientation. I WI'IE'I'! the temperature is high enough for the thermal energy to overcome the organized spin coupling within magnetic domains, ferromagnetic substances become paramagnetic and obeyr Eurie's Law. Below this Curie temperature, though, ferromagnetisrn deviates from Curie's Law, allowing permanent magnetization, for example. In other words, for ferromagnetic substances below the lIIurie temperature, the magnetization depends on the history of the substance as well as the applied field. UN AT'I'PIEAL lIIIIIII.F’REHEN5|"II"E ENAM, ANSWERING IIIMPLEI LEDIIINE MAGNEI'IIATIDN QUESTIIDIIE IEIENERALL'i!r DDESN'T REQUIRE HIIEIHL‘iIr AWANEED RNDWLEDEE. WITH MENETISM IT'S EASYTD PUT BASIC PRINCIPLES IHTEI A DIFFICULT LflflKIHG [WEI-IT. c zoos .J wrrzct ...
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