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SUMMARY:Detection and manipulation of spins in semiconductors and metals -
  Dr. Mark Hickey (Stoner Laboratory\, University of Leeds\, U.K)
DTSTART:20061120T141500Z
DTEND:20061120T151500Z
UID:TALK5899@talks.cam.ac.uk
CONTACT:K DAS GUPTA
DESCRIPTION:Magneto-electronics\, as a field of research comprises two dis
 tinct\navenues - metal spintronics and semiconductor spintronics. Spin inj
 ection\nexperiments from ferromagnetic transition metals and alloys into G
 aAs and\nInGaAs quantum wells represent a nice fusion of the two areas. In
  this talk\,\nthe non-equilibrium character of spin states injected into q
 uantum wells and\nbulk semiconductors will be explored up to room temperat
 ure. The optical\ndetection method described here is based on the Hanle ef
 fect and this\ndynamical phenomenon is described by a variation of the\nLa
 ndau-Lifshitz-Gilbert equation. In metals\, equilibrium electron spin\ncon
 figurations are computed and measured and their description relies on the\
 nsame dynamics in the presence of the exchange interaction. Competition\nb
 etween exchange energy and anisotropy energy in metals gives rise to\nmagn
 etic domains\, and the manipulation and detection of these objects by\nmag
 netic field and electric current has recently become an subject of\nfuriou
 s study.\n
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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