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SUMMARY:Intrinsic Ferromagnetic Semiconductors: Rare-Earth Mononitrides
DTSTART:20131216T141500
DTSTAMP:20260916T043419Z
UID:689a9af7ed973a0526b9c5a1c3f2ef765e050b0b6e5494d57e94a5c5
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Joe Trodahl\, Victoria University of Wellington\nBio: Jo
 e's current research interests are a colourful mix of different topics inc
 luding studies of the rare-earth nitrides and Raman spectroscopy applied t
 o a wide variety of materials. Joe's work involves collaboration with nume
 rous students\, postdocs\, and academics at VUW and the MacDiarmid Institu
 te\, and at other institutions in New Zealand and around the world.\nFor a
  decade from the late 1990s there was an intense effort on diluted ferroma
 gnetic semiconductors (DMS)\, aimed largely to raise their Curie temperatu
 re to ambient. The interest continued for so long despite that the heavy d
 oping\, typically 5-10% in\, for example\, (Ga\,Mn)As rendered them degene
 rately hole doped. Intrinsic ferromagnetic semiconductors would offer even
  more hope of active devices with well-defined transport in spin-selected 
 channels. However\, there are remarkably few such semiconductors.\nThe nit
 rides of the rare earth elements are an attractive exception. The adopt th
 e NaCl structure with epitaxial compatibility both across the series and w
 ith the III-nitrides.  Most of the fourteen examples are ferromagnetic an
 d the half that have been well characterised are all semiconductors. The l
 ack of orbital quenching\, as is familiar in transition metal compounds\, 
 leads to significant and sometimes dominating orbital contributions to the
 ir magnetic moments\, which in turn gives them a range of strongly contras
 ting magnetic and magnetotransport behaviours. Like the DMS systems they d
 isplay ferromagnetism only well below ambient temperature\; but their dope
 -able transport offers promise.\nThis presentation will describe our REN p
 rogramme\, based on growth of both homogeneous and multilayered films.  T
 hey are investigated by conventional magnetic\, magnetotransport and optic
 al/X-ray spectroscopies to determine their spin-split band structure and t
 he atomic shell-resolved magnetic moments. Special attention will be given
  to the pure spin moment in GdN\, the nearly perfect cancellation of spin 
 and orbital ferromagnetic moments in SmN and the DMS behaviour of normally
  nonmagnetic EuN.
LOCATION:PH L1 503 http://plan.epfl.ch/?room=PHL1503
STATUS:CONFIRMED
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