Strong paramagnetism of Gold nanoparticles deposited on a Sulfolobus acidocaldarius S-layer

Strong paramagnetism of Gold nanoparticles deposited on a Sulfolobus acidocaldarius S-layer

Bartolome, J.; Bartolome, F.; Garcia, L. M.; Figueroa, A. I.; Repolles, A.; Martinez, M. J.; Luis, F.; Magen, C.; Selenska-Pobell, S.; Pobell, F.; Reitz, T.; Schönemann, T.; Herrmannsdörfer, T.; Merroun, M.; Geissler, A.; Wilhelm, F.; Rogalev, A.

Abstract

Magnetic properties of Au nanoparticles deposited on an archaeal S-layer are reported. XMCD and SQUID 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 2.36(7) mkB. This contribution originates at the particles 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.

Keywords: Au nanoparticles; archaeal S-layer; XMCD; SQUID; paramagnetism

Involved research facilities

  • High Magnetic Field Laboratory (HLD)

Permalink: https://www.hzdr.de/publications/Publ-17545