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SUMMARY:New Directions for Organic Spintronics - Professor Ezekiel Johnsto
 n-Halperin
DTSTART:20160212T140000Z
DTEND:20160212T150000Z
UID:TALK64467@talks.cam.ac.uk
CONTACT:Stuart Higgins
DESCRIPTION:The study of magnetism dates back to at least the 6th century 
 BCE with the discovery of  lodestone  in  Ancient  Greece  and  its  immed
 iate  implementation  as  a  primitive navigational   aid.   This   genesi
 s   sets   the   tone   for   over   2\,500   years   of   practical appli
 cations  that  significantly  lead  fundamental  understanding  of  the  u
 nderlying principles. Even today\, our ability to predict magnetic interac
 tions in new materials substantially  lags  our  ability  to  predict  oth
 er  materials  properties  while  magnetic phenomena    form    the    fou
 ndation    of    applications    ranging    from    automotive engineering
    to   information   technology.   This   tension   creates   an   exciti
 ng   and somewhat   unusual   opportunity   for   fundamental   research\,
  where   advances   in understanding have the potential to both open up ne
 w directions at the frontiers of science and reflect back through well est
 ablished technologies.\n\nHere\,  I  will  present  work  that  exploits  
 this  potential  through  the  development  of organic-based    magnetic  
   materials    based     on    vanadium    tetracyanoethelyne (V[TCNE]2)  
 and  its  derivatives. The  magnetic  ordering  in  V[TCNE]2 is  surprisin
 gly robust and complex\, with a Curie temperature of over 600 K and a low 
 temperature transition  to  a  spin-glass  like  state  known  as  a  sper
 rimagnet  at  150  K.  Leveraging this  magnetic  functionality  we  have 
  demonstrated  DC  spintronic  functionality  in hybrid   V[TCNE]2/III-V  
  semiconductor   heterostructures\,   and   inspired   by   the developmen
 t   of   ferromagnetic   resonance   (FMR)   driven   spin   pumping in   
 both inorganic  and  non-magnetic  organic  materials\,  we  have  recentl
 y begun  exploring the  extension  of  this  spin  functionality  into  th
 e  microwave  regime.  These  studies reveal that in our optimized thin fi
 lms we are able to achieve FMR line widths as low as  1  G\,  comparable  
 to  the  best  thin-films  of  the Dzgold  standarddz  inorganic  system y
 ittrium iron garnet (YIG). These results are promising for the development
  of next generation all organic spintronic devices\, but may in fact have 
 an equal if not greater impact on  established  microwave  frequency  magn
 etoelectronics.  When  combined with  our  recent  demonstration  of  enca
 psulation  technologies  that  allow  for  device operation  under  ambien
 t  conditions\,  these  results  promise  dramatic  advances  in our  abil
 ity  to  construct  topologically  complex  microwave  devices and  the  a
 bility  to integrate magnetic functionality into existing flexible electro
 nic architectures. 
LOCATION:MRC Building Seminar Room\, Cavendish Laboratory\, Department of 
 Physics
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