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Magneto-optical enhancement by surface plasmon resonance in magnetic “nano-onions” with multicore-shell structures

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2 Author(s)
Abe, Masanori ; Department of Physical Electronics, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan ; Takeshi, Suwa

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Calculations based on the Maxwell–Garnett theory revealed a remarkable enhancement of the magneto-optical effect due to surface plasmon resonance excited in nanometer sized magnetic particles (“nano-onions”) with n-fold core-shell structures consisting of shell(s) and/or a core of noble metals such as Au and Ag. The Kerr effect was found to be greatly enhanced in a composite containing nano-onions of threefold Fe(or CoFe2O4)(core)/dielectric(shell)/Ag(shell) structure and also in a composite containing twofold Bi-YIG(core)/Ag(shell) nano-onions. In the latter case, the Kerr rotation angle as large as 13.5° was obtained with a figure of merit,

, (R is the reflectivity) at ħω=2.6 eV, which is much larger than the highest values of θK=19° and
, reported for PtMnSb.

Published in:

Journal of Applied Physics  (Volume:97 ,  Issue: 10 )

Date of Publication:

May 2005

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