Direct Observation of Ferromagnetic State in Gold Nanorods Probed using Electron Spin Resonance Spectroscopy

Yuji Inagaki; Tatsuya Kawae; Natsuko Sakai; Yuta Makihara; Hiroaki Yonemura; Sunao Yamada

Direct Observation of Ferromagnetic State in Gold Nanorods Probed using Electron Spin Resonance Spectroscopy

Mesoscale and Nanoscale Physics 2015-02-18 v1

Authors: Yuji Inagaki , Tatsuya Kawae , Natsuko Sakai , Yuta Makihara , Hiroaki Yonemura , Sunao Yamada

Abstract

X-band electron spin resonance (ESR) spectroscopy has been performed for gold nanorods (AuNRs) of four different sizes covered with a diamagnetic stabilizing component, cetyltrimethylammmonium bromide. The ESR spectra show ferromagnetic features such as hysteresis and resonance field shift, depending on the size of the AuNRs. In addition, the ferromagnetic transition is indicated by an abrupt change in the spectra of the two smallest AuNRs studied. A large g-value in the paramagnetic region suggests that the ferromagnetism in the AuNRs originates from strong spin-orbit interaction.

Keywords

gold nanorods ferromagnetic state electron spin resonance spin-orbit interaction size dependence hysteresis

Cite

@article{arxiv.1502.04934,
  title  = {Direct Observation of Ferromagnetic State in Gold Nanorods Probed using Electron Spin Resonance Spectroscopy},
  author = {Yuji Inagaki and Tatsuya Kawae and Natsuko Sakai and Yuta Makihara and Hiroaki Yonemura and Sunao Yamada},
  journal= {arXiv preprint arXiv:1502.04934},
  year   = {2015}
}

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Direct Observation of Ferromagnetic State in Gold Nanorods Probed using Electron Spin Resonance Spectroscopy

Abstract

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