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Issue 14, 2013
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Gigantic plasmon resonance effects on magneto-optical activity of molecularly thin ferromagnets near gold surfaces

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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

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Publication details

The article was received on 30 Dec 2012, accepted on 20 Feb 2013 and first published on 04 Mar 2013


Article type: Communication
DOI: 10.1039/C3TC00952A
Citation: J. Mater. Chem. C, 2013,1, 2520-2524

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    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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