Exposure of the hidden anti-ferromagnetism in paramagnetic CdSe:Mn nanocrystals

Shou Jyun Zou, Sheng Tsung Wang, Ming Fan Wu, Wen-Bin Jian, Shun-Jen Cheng*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

We present theoretical and experimental investigations of the magnetism of paramagnetic semiconductor CdSe:Mn nanocrystals and propose an efficient approach to the exposure and analysis of the underlying anti-ferromagnetic interactions between magnetic ions therein. A key advance made here is the development of an analysis method with the exploitation of group theory technique that allows us to distinguish the anti-ferromagnetic interactions between aggregative Mn2+ ions from the overall pronounced paramagnetism of magnetic-ion-doped semiconductor nanocrystals. By using the method, we clearly reveal and identify the signatures of anti-ferromagnetism from the measured temperature-dependent magnetisms and furthermore determine the average number of Mn2+ ions and the fraction of aggregative ones in the measured CdSe:Mn nanocrystals.

Original languageEnglish
Pages (from-to)503-511
Number of pages9
JournalACS Nano
Volume9
Issue number1
DOIs
StatePublished - 27 Jan 2015

Keywords

  • CdSe
  • Mn
  • anti-ferromagnetism
  • magnetic semiconductor nanocrystals
  • paramagnetism

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