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Permanent Magnetism, Magnetic Anisotropy, and Hysteresis of Thiol-Capped Gold Nanoparticles
Open accessAbstract
We report on the experimental observation of magnetic hysteresis up to room temperature in thiol-capped Au nanoparticles with 1.4 nm size. The coercive field ranges from 860 Oe at 5 K to 250 Oe at 300 K. It is estimated that the Au atoms exhibit a magnetic moment of mu=0.036mu(B). However, Au nanoparticles with similar size but stabilized by means of a surfactant, i.e., weak interaction between protective molecules and Au surface atoms, are diamagnetic, as bulk Au samples are. The apparent ferromagnetism is consequently associated with 5d localized holes generated through Au-S bonds. These holes give rise to localized magnetic moments that are frozen in due to the combination of the high spin-orbit coupling (1.5 eV) of gold and the symmetry reduction associated with two types of bonding: Au-Au and Au-S.
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Citations
Cited by
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Fundamentals and application of magnetic particles in cell isolation and enrichment: a review
Plouffe, B. D., Murthy, S. K., & Lewis, L. H. (2015) · Reports on Progress in Physics · doi:10.1088/0034-4885/78/1/016601 · Cited by 334
Ben Dor, O., Yochelis, S., Radko, A., Vankayala, K., Capua, E., Capua, A., Yang, S.-H., Baczewski, L. T., Parkin, S. S. P., Naaman, R., et al. (2017) · Nature Communications · doi:10.1038/ncomms14567 · Cited by 218
Metadata
- Authors
- Crespo, P., Litrán, R., Rojas, T. C., Multigner, M., de la Fuente, J. M., Sánchez-López, J. C., García, M. A., Hernando, A., Penadés, S., & Fernández, A.
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2004-08-20
- Volume
- 93
- Issue
- 8
- Pages
- 087204-087204
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W2010421945
- Cited by
- 551
- References
- 0
- FWCI
- 20.44
- Type
- journal article
- Language
- en
- Open access
- green
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- Crespo, P., Litrán, R., Rojas, T. C., Multigner, M., de la Fuente, J. M., Sánchez-López, J. C., García, M. A., Hernando, A., Penadés, S., & Fernández, A. (2004). Permanent Magnetism, Magnetic Anisotropy, and Hysteresis of Thiol-Capped Gold Nanoparticles. Physical Review Letters. https://doi.org/10.1103/physrevlett.93.087204
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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