Giant Magnetic Susceptibility of Gold Nanorods Detected by Magnetic Alignment

P. G. van Rhee, P. Zijlstra, T. G. A. Verhagen, J. Aarts, M. I. Katsnelson, J. C. Maan, M. Orrit, and P. C. M. Christianen

Phys. Rev. Lett. 111, 127202 – Published 17 September 2013

Abstract

We have determined the magnetic properties of single-crystalline Au nanorods in solution using an optically detected magnetic alignment technique. The rods exhibit a large anisotropy in the magnetic volume susceptibility ( $Δ χ_{V}$ ). $Δ χ_{V}$ increases with decreasing rod size and increasing aspect ratio and corresponds to an average volume susceptibility ( $χ_{V}$ ), which is drastically enhanced relative to bulk Au. This high value of $χ_{V}$ is confirmed by SQUID magnetometry and is temperature independent (between 5 and 300 K). Given this peculiar size, shape, and temperature dependence, we speculate that the enhanced $χ_{V}$ is the result of orbital magnetism due to mesoscopic electron trajectories within the nanorods.

Received 19 July 2013

DOI:https://doi.org/10.1103/PhysRevLett.111.127202

Authors & Affiliations

P. G. van Rhee¹, P. Zijlstra², T. G. A. Verhagen³, J. Aarts³, M. I. Katsnelson⁴, J. C. Maan¹, M. Orrit², and P. C. M. Christianen^1,*

¹High Field Magnet Laboratory, Institute of Molecules and Materials, Radboud University Nijmegen, Toernooiveld 7, 6525 ED Nijmegen, Netherlands
²Institute of Physics, Leiden University, P.O. Box 9504, 2300 RA Leiden, Netherlands
³Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, Netherlands
⁴Institute of Molecules and Materials, Radboud University Nijmegen, Heyendaalseweg 135, 6525 AJ Nijmegen, Netherlands

^*P.Christianen@science.ru.nl

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Vol. 111, Iss. 12 — 20 September 2013

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