Strong Paramagnetism of Gold Nanoparticles Deposited on a Sulfolobus acidocaldarius S Layer

J. Bartolomé, F. Bartolomé, L. M. García, A. I. Figueroa, A. Repollés, M. J. Martínez-Pérez, F. Luis, C. Magén, S. Selenska-Pobell, F. Pobell, T. Reitz, R. Schönemann, T. Herrmannsdörfer, M. Merroun, A. Geissler, F. Wilhelm, and A. Rogalev
Phys. Rev. Lett. 109, 247203 – Published 10 December 2012

Abstract

Magnetic properties of Au nanoparticles deposited on an archaeal S layer are reported. X-ray magnetic circular dichroism and superconducting quantum interference device magnetometries demonstrate that the particles are strongly paramagnetic, without any indication of magnetic blocking down to 16 mK. The average magnetic moment per particle is Mpart=2.36(7) μB. This contribution originates at the particle’s Au 5d band, in which an increased number of holes with respect to the bulk value is observed. The magnetic moment per Au atom is 25 times larger than any measured in other Au nanoparticles or any other configurations up to date.

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  • Received 28 June 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.247203

© 2012 American Physical Society

Authors & Affiliations

J. Bartolomé1,2,*, F. Bartolomé1,2, L. M. García1,2, A. I. Figueroa1,2, A. Repollés1,2, M. J. Martínez-Pérez1,2, F. Luis1,2, C. Magén2,3, S. Selenska-Pobell4, F. Pobell4, T. Reitz4, R. Schönemann4, T. Herrmannsdörfer4, M. Merroun5, A. Geissler4, F. Wilhelm6, and A. Rogalev6

  • 1Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC—Universidad de Zaragoza, E-50009 Zaragoza, Spain
  • 2Departamento de Física de la Materia Condensada, Universidad de Zaragoza, E-50009 Zaragoza, Spain
  • 3Laboratorio de Microscopías Avanzadas (LMA), Instituto de Nanociencia de Aragón (INA)—ARAID, Universidad de Zaragoza, E-50018 Zaragoza, Spain
  • 4Institute of Resource Ecology and Dresden High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf, D-01328 Dresden, Germany
  • 5Department of Microbiology, University of Granada, E-18071 Granada, Spain
  • 6European Synchrotron Radiation Facility (ESRF)- BP 220, F-38043 Grenoble, France

  • *barto@unizar.es

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Vol. 109, Iss. 24 — 14 December 2012

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