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 language | English |
|---|---|
| Pages (from-to) | 792-797 |
| Number of pages | 6 |
| Journal | Nature Nanotechnology |
| Volume | 7 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - Dec 2012 |
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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
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 journal › Article
}
TY - JOUR
T1 - Long-lived photoinduced magnetization in copper-doped ZnSe-CdSe core-shell nanocrystals
AU - Pandey, A.
AU - Brovelli, S.
AU - Viswanatha, R.
AU - Li, L.
AU - Pietryga, J. M.
AU - Klimov, Victor I
AU - Crooker, S. A.
PY - 2012/12
Y1 - 2012/12
N2 - 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.
AB - 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.
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U2 - 10.1038/nnano.2012.210
DO - 10.1038/nnano.2012.210
M3 - Article
VL - 7
SP - 792
EP - 797
JO - Nature Nanotechnology
JF - Nature Nanotechnology
SN - 1748-3387
IS - 12
ER -