Long-lived photoinduced magnetization in copper-doped ZnSe-CdSe core-shell nanocrystals

A. Pandey, S. Brovelli, R. Viswanatha, L. Li, J. M. Pietryga, Victor I Klimov, S. A. Crooker

Research output: Contribution to journalArticle

72 Citations (Scopus)

Abstract

Nanoscale materials have been investigated extensively for applications in memory and data storage. Recent advances include memories based on metal nanoparticles1, nanoscale phase-change materials2 and molecular switches3. Traditionally, magnetic storage materials make use of magnetic fields to address individual storage elements. However, new materials with magnetic properties addressable via alternative means (for example, electrical or optical) may lead to improved flexibility and storage density and are therefore very desirable. Here, we demonstrate that copper-doped chalcogenide nanocrystals exhibit not only the classic signatures of diluted magnetic semiconductors4 - namely, a strong spin-exchange interaction between paramagnetic Cu2+ dopants and the conduction/valence bands of the host semiconductor - but also show a pronounced and long-lived photoinduced enhancement of their paramagnetic response. Magnetic circular dichroism studies reveal that paramagnetism in these nanocrystals can be controlled and increased by up to 100% when illuminated with above-gap (blue/ultraviolet) light. These materials retain a memory of the photomagnetization for hour-long timescales in the dark, with effects persisting up to ~80 K.

Original languageEnglish
Pages (from-to)792-797
Number of pages6
JournalNature Nanotechnology
Volume7
Issue number12
DOIs
Publication statusPublished - Dec 2012

Fingerprint

Nanocrystals
Copper
Magnetization
nanocrystals
Data storage equipment
copper
magnetization
magnetic storage
paramagnetism
spin exchange
Magnetic storage
data storage
Paramagnetism
ultraviolet radiation
dichroism
Exchange interactions
flexibility
Dichroism
Valence bands
signatures

ASJC Scopus subject areas

  • Bioengineering
  • Biomedical Engineering
  • Materials Science(all)
  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics

Cite this

Pandey, A., Brovelli, S., Viswanatha, R., Li, L., Pietryga, J. M., Klimov, V. I., & Crooker, S. A. (2012). Long-lived photoinduced magnetization in copper-doped ZnSe-CdSe core-shell nanocrystals. Nature Nanotechnology, 7(12), 792-797. https://doi.org/10.1038/nnano.2012.210

Long-lived photoinduced magnetization in copper-doped ZnSe-CdSe core-shell nanocrystals. / Pandey, A.; Brovelli, S.; Viswanatha, R.; Li, L.; Pietryga, J. M.; Klimov, Victor I; Crooker, S. A.

In: Nature Nanotechnology, Vol. 7, No. 12, 12.2012, p. 792-797.

Research output: Contribution to journalArticle

Pandey, A, Brovelli, S, Viswanatha, R, Li, L, Pietryga, JM, Klimov, VI & Crooker, SA 2012, 'Long-lived photoinduced magnetization in copper-doped ZnSe-CdSe core-shell nanocrystals', Nature Nanotechnology, vol. 7, no. 12, pp. 792-797. https://doi.org/10.1038/nnano.2012.210
Pandey, A. ; Brovelli, S. ; Viswanatha, R. ; Li, L. ; Pietryga, J. M. ; Klimov, Victor I ; Crooker, S. A. / Long-lived photoinduced magnetization in copper-doped ZnSe-CdSe core-shell nanocrystals. In: Nature Nanotechnology. 2012 ; Vol. 7, No. 12. pp. 792-797.
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