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SUMMARY: Tuneable interface exchange for optical magnetisation control - D
 r Theo Trypiniotis (TFM)
DTSTART:20111110T143000Z
DTEND:20111110T153000Z
UID:TALK33982@talks.cam.ac.uk
CONTACT:Kimberly Cole
DESCRIPTION:Beyond studies of spin dependent transport which have traditio
 nally dominated the field of spintronics\, an increasing number of investi
 gations of more 'exotic' spin related phenomena are being reported in the 
 last few years. In this talk I will present the extension of our work in s
 pin transport\, into the use of spin accumulation for the optical control 
 of magnetisation.\n\nWe can routinely use optical spin orientation in III-
 V semiconductors as a reliable spin source for spin transport investigatio
 ns. We have recently successfully combined the above with ferromagnetic re
 sonance (FMR) measurements on epitaxial ferromagnetic-metal/semiconductor 
 interfaces. The optically controlled spin polarised carrier population at 
 the interface affects the ferromagnet magnetisation via an interface excha
 nge interaction the signature of which is measured in the FMR response. We
  have demonstrated an effective exchange field of the order of tens of Gau
 ss at room temperature\, which offers a new method for the optical control
  of magnetization.\n\n
LOCATION:Mott Seminar Room\, Cavendish Laboratory
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