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High Ferromagnetic Transition Temperature in PbS and PbS:Mn Nanowires.
MedLine Citation:
PMID:  22141428     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Spontaneous magnetization measured in the temperature range 5-300 K with high ferromagnetic transition temperature (Tc) has been observed in both undoped and Mn doped (2 to 8 mol%) PbS nanowires (diameter 30 nm) in polymer. For undoped sample, we find Tc ~ 290 K while for doped samples Tc varies between 310-340 K depending on Mn concentrations. Both Tc and coercive fields are critically dependent on Mn concentrations. Coercive fields show a T0.5 dependence with temperature for a moderate concentration of Mn (4 mol%) in PbS while it deviates from T0.5 behavior for higher Mn concentrations. Anionic defects arising out of nonstoichiometric growth is solely responsible for the observed magnetism in undoped PbS nanowires. The role of intrinsic strain along with reduced dimensionality in determining such high Tc and overall magnetizations has been discussed.
Authors:
Swapan K Mandal; Arup Ratan Mandal; Sangam Banerjee
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-12-5
Journal Detail:
Title:  ACS applied materials & interfaces     Volume:  -     ISSN:  1944-8252     ISO Abbreviation:  -     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2011-12-6     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101504991     Medline TA:  ACS Appl Mater Interfaces     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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