Issue 14, 2013

Gigantic plasmon resonance effects on magneto-optical activity of molecularly thin ferromagnets near gold surfaces

Abstract

We report on a new magneto-plasmonic material consisting of 1 nm thick ferromagnetic nanosheets and Au nanoparticles. The magneto-optical (MO) Kerr spectra of Ti0.8Co0.2O2 nanosheets near Au surfaces showed a gigantic MO response (∼106 deg cm−1) in the visible wavelength region (380–600 nm), not present in Ti0.8Co0.2O2 nanosheets on a bare glass substrate. The observed peaks correspond to intrinsic d–d* electronic transitions in Ti0.8Co0.2O2 and are consistent with the near-field enhancement of the MO response resulting from the spectral overlap of the surface-plasmon-resonance (SPR) in the Au surface with the electronic transitions in Ti0.8Co0.2O2. Similar SPR effects were also achieved in ferromagnetic nanosheet/Au with different compositions and with different separation distances (<5 nm). This demonstration of SPR-enhanced magneto-optics in the ferromagnetic/plasmonic nanosystem may enable designing of nanoarchitectures for miniaturized high-performance MO devices and for remote sensing and imaging of magnetic fields.

Graphical abstract: Gigantic plasmon resonance effects on magneto-optical activity of molecularly thin ferromagnets near gold surfaces

Supplementary files

Article information

Article type
Communication
Submitted
30 Kax 2012
Accepted
20 Nah 2013
First published
04 Cig 2013

J. Mater. Chem. C, 2013,1, 2520-2524

Gigantic plasmon resonance effects on magneto-optical activity of molecularly thin ferromagnets near gold surfaces

M. Osada, N. Hajduková-Šmídová, K. Akatsuka, S. Yoguchi and T. Sasaki, J. Mater. Chem. C, 2013, 1, 2520 DOI: 10.1039/C3TC00952A

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