quiz12sp02 - ENSC 3313, Spring 2002 Quiz 12 Name 3~ .nswer...

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Unformatted text preview: ENSC 3313, Spring 2002 Quiz 12 Name 3~ .nswer anv 4 Questions onlv, 1 point each 1 Describe the half band concept with reference to paramagnetism. In an energy band, there can be 2 electrons at any energy level with opposite spins. Accordingly, conceptually the band can be split up into 2 half bands. In an applied electric field, a halfband shift occurs; it being favorable to spin with the field. This leads to electron transfer across partially filled half bands such that more electrons spin with the field, until match up again occurs at the Fermi energy level. -Ref. overhead projector. diagram 26-1. Illustrate, by means of a plot, how the extent of magnetization varies with temperature. Add explanatory comments. 2. Magnetism is due to unpaired electrons aligning their spins. Thermal energy promotes spin randomization that eventually wins out. -Ref. overhead projector diagram 26-2. FERROMAGNETISM CURIE TEMPERATURE T....
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This note was uploaded on 01/10/2012 for the course ENSC 3313 taught by Professor Staff during the Fall '11 term at Oklahoma State.

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quiz12sp02 - ENSC 3313, Spring 2002 Quiz 12 Name 3~ .nswer...

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