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Univ. Paris-Saclay
ZnO nanoparticles heavily doped with Mn prepared by sol-gel method
Ladislav Nádherný
Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Czech Republic
Jeudi 05/03/2020, 14:30
CIMAP Caen, Ganil Caen

Résumé :

Recent  advances  in  the  theory  and  experimental  realization  of  ferromagnetic  semiconductors  give  hope  that  a  new  generation  of  microelectronic  devices  based  on  the  spin  degree  of  freedom  of  the  electron  can  be  developed. Room-temperature ferromagnetism was firstly predicted for p-type ZnO with 5 at.% Mn [Dietl et al., Science287,  1019  (2000)]. A  large  amount  of  reports  on  „dilute  magnetic  semiconductors“  in  form  of  thin  films  and  nanoparticles  followed,  and  high-temperature  ferromagnetism  was  observed  also  in  this system  withouttransition  metal  (TM) doping.  Unfortunately,  the  data  are  plagued  by  instability  and  a  lack  of  reproducibility. Ferromagnetism in diluted doped ZnO is still far from understood. The presence or absence of ferromagnetism inMn  doped  ZnO  critically  depends  on  the  synthesis  method,  Mn–Mn  spacing,  carrier  density  and  ZnO  type[Pearton et al., J Appl Physics, 93 (2003)]. Our contribution follows the Dietl’s prediction and its main aim was to study the  solubility and  distribution  of  Mn  in  ZnO  prepared  by  the  citrate  sol-gel  method.  A  series  of  ZnO:Mn  nanopowders  with  different  Mn  content  was  prepared  and  their  structural  and  magnetic  properties  aredescribed and discussed.

 

 

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