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SUMMARY:Rare-earth nitrides\; semiconductors\, spin/orbit magnetism\, tunn
 elling MRAM\, superconductivity
DTSTART:20181026T151500
DTSTAMP:20260528T175158Z
UID:7afcd088a04e2027c32be20c0d07417bba67916b3c1303159209600c
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Joe Trodahl\nRare-earth Nitrides\; Semiconductors\, Spi
 n/orbit Magnetism\, Tunnelling MRAM\, Superconductivity:\nControlling the
  flow of electronic spin in addition to the charge promises speed and pow
 er demand advantages. However\, there are as yet few “spintronic” dev
 ices on the market\, in part due to a lack of intrinsic ferromagnetic sem
 iconductors that would permit full exploitation of the coupled spin/charge
  technology. To date the only full series of such materials are the monon
 itrides of the lanthanides\, the 14 rare-earth elements. Many of the LN (
 L a lanthanide element) are intrinsic ferromagnetic dopable semiconductor
 s\, with strongly contrasting magnetic properties which result from the c
 oupled spin and orbital moments residing in the lanthanide 4f shells.[1]
  We started investigating epitaxial and polycrystalline film growth and e
 lectronic-magnetic properties of these compounds a decade ago\, motivated
  by a prediction of half metals among their number\,[2] only to discover 
 their semiconducting nature. In the past few years we advanced enough to
  begin work on LN/L’N heterostructures\, including tunnelling devices.[
 3] Furthermore we have investigated integration with both the optical II
 I-V semiconductors and superconductors of interest for their potential in
  central processors. Along the way there have been many surprises\, most
  recently that one of the series\, near-zero-magnetisation ferromagnetic 
 SmN\, is superconducting below 4 K.[4] My talk will cover the lot\, the 
 growth conditions and crystal structure\, control of their carrier concen
 tration\, investigations of their coupled magnetic/electronic properties\
 , tunnelling in device-like structures and the observation of the remark
 able superconductivity in doped SmN.\n \nReferences:\n\n[1] F. Natali et
  al\, Prog. Materials Science 58\, 1316 (2013).\n\n[2] C. M. Aerts et al.
 \, Phys. Rev. B 69\, 045115 2004.\n\n[3] H. Warring et al\, Phys. Rev. A
 ppl. 6\, 044002 (2016).\n\n[4] E.-M. Anton et al\, Phys. Rev. B 94\, 024
 106 (2016).\n\n \nAbout the research of the speaker: https://www.victori
 a.ac.nz/scps/about/staff/joe-trodahl\n \n 
LOCATION:
STATUS:CONFIRMED
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