Tuning the magneto-optical response of iron oxide nanocrystals in Au- and Ag-based plasmonic media.

We investigated the magneto-optical response of chemically synthesized iron oxide magnetic nanocrystals, optically coupled with ordered planar arrays of plasmonic nanoparticles. We compare the signals from two classes of systems, featuring either Au or Ag as the plasmonic counterpart. The localized surface plasmon resonance of the Ag and Au nanoparticles arrays were superimposed or detuned, respectively, with respect to the dominant magneto-optical transitions of the magnetic material. Under resonance, a significant enhancement of the magneto-optical signal was observed. In both cases, we could separate the purely plasmonic and the magnetic contributions in the magneto-optical spectrum of the optically coupled composite based on their different magnetic-field dependence.

[1]  Álvaro Somoza,et al.  Synthesis and surface modification of uniform MFe2O4 (M = Fe, Mn, and Co) nanoparticles with tunable sizes and functionalities , 2012, Journal of Nanoparticle Research.

[2]  R. Fujikawa,et al.  Contribution of the surface plasmon resonance to optical and magneto-optical properties of a Bi:YIG-Au nanostructure , 2008 .

[3]  George C. Schatz,et al.  Electrodynamics of Noble Metal Nanoparticles and Nanoparticle Clusters , 1999 .

[4]  C. Ross,et al.  Microstructure and optical properties of pulsed-laser-deposited iron oxide films , 2004, IEEE Transactions on Magnetics.

[5]  E. Tronc,et al.  Magnetic order in ? - Fe 2 O 3 nanoparticles: a XMCD study , 2005 .

[6]  Š. Višňovský,et al.  Magneto-optical Kerr spectra of nickel , 1993 .

[7]  Ronald Walsworth,et al.  Surface plasmon resonance enhanced magneto-optics (SuPREMO): Faraday rotation enhancement in gold-coated iron oxide nanocrystals. , 2009, Nano letters.

[8]  E. Stern,et al.  Magneto-optic Kerr Effect in Ni, Co, and Fe , 1973 .

[9]  Taeghwan Hyeon,et al.  Ultra-large-scale syntheses of monodisperse nanocrystals , 2004, Nature materials.

[10]  R. Metselaar,et al.  Optical and magneto-optical polar Kerr spectra of Fe3O4 and Mg2+- or Al3+-substituted Fe3O4 , 1997 .

[11]  R. Miranda,et al.  Controlled synthesis of uniform magnetite nanocrystals with high-quality properties for biomedical applications , 2012 .

[12]  Achanta Venu Gopal,et al.  Enhanced magneto-optical effects in magnetoplasmonic crystals. , 2011, Nature nanotechnology.

[13]  F. Monte,et al.  Faraday rotation in magnetic γ-Fe2O3/SiO2 nanocomposites , 1997 .

[14]  A. Sugawara,et al.  Surface morphology of epitaxial LiF(110) and CaF2(110) layers , 2005 .

[15]  U. Kreibig,et al.  OPTICAL ABSORPTION OF SMALL METALLIC PARTICLES , 1985 .

[16]  Jordan A. Katine,et al.  Magnetic recording at 1.5 Pb m −2 using an integrated plasmonic antenna , 2010 .

[17]  M. Gurioli,et al.  Photocoercivity of Nano‐Stabilized Au:Fe Superparamagnetic Nanoparticles , 2010, Advanced materials.

[18]  Duane C. Karns,et al.  Heat-assisted magnetic recording by a near-field transducer with efficient optical energy transfer , 2009 .

[19]  S. Bonetti,et al.  Designer Magnetoplasmonics with Nickel Nanoferromagnets , 2011, Nano letters.

[20]  Shin Saito,et al.  Evidence of localized surface plasmon enhanced magneto-optical effect in nanodisk array , 2010 .

[21]  M. El-Sayed,et al.  Some interesting properties of metals confined in time and nanometer space of different shapes. , 2001, Accounts of chemical research.

[22]  E. Coronado,et al.  The Optical Properties of Metal Nanoparticles: The Influence of Size, Shape, and Dielectric Environment , 2003 .

[23]  L M Lechuga,et al.  Plasmon-induced magneto-optical activity in nanosized gold disks. , 2010, Physical review letters.

[24]  Borja Sepúlveda,et al.  Plasmonic Au/Co/Au nanosandwiches with enhanced magneto-optical activity. , 2008, Small.

[25]  B. Kalska,et al.  Magnetite particles studied by Mssbauer and magneto-optical Kerr effect , 2004 .

[26]  José Miguel García-Martín,et al.  Localized surface plasmon resonance effects on the magneto-optical activity of continuous Au/Co/Au trilayers. , 2008, Optics express.

[27]  C. Noguez.  Surface Plasmons on Metal Nanoparticles: The Influence of Shape and Physical Environment , 2007 .

[28]  A. Sugawara,et al.  Optical second-harmonic spectroscopy of Au nanowires , 2004 .

[29]  S. Melle,et al.  Magneto-optical properties of nickel nanowire arrays , 2003 .

[30]  Satoshi Tomita,et al.  Magneto-optical Kerr effects of yttrium-iron garnet thin films incorporating gold nanoparticles. , 2006, Physical review letters.

[31]  M. Canepa,et al.  Flexible Tuning of Shape and Arrangement of Au Nanoparticles in 2-Dimensional Self-Organized Arrays: Morphology and Plasmonic Response , 2011 .

[32]  A. Brun,et al.  Magnetically textured γ-Fe2O3 nanoparticles in a silica gel matrix: Optical and magneto-optical properties , 1999 .

[33]  P. Hui,et al.  Theory of Faraday rotation by dilute suspensions of small particles , 1987 .

[34]  Lei Wang,et al.  Plasmonics and enhanced magneto-optics in core-shell co-ag nanoparticles. , 2011, Nano letters.

[35]  B. Sepúlveda,et al.  Cobalt dependence of the magneto-optical response in magnetoplasmonic nanodisks , 2010 .

[36]  Werner Gillijns,et al.  Plasmons reveal the direction of magnetization in nickel nanostructures. , 2011, ACS nano.

[37]  Lei Wang,et al.  Localized surface plasmon resonance enhanced magneto-optical activity in core-shell Fe–Ag nanoparticles , 2010 .

[38]  Gabriel Shemer,et al.  Enhancement of Magneto-Optical Effects in Magnetite Nanocrystals Near Gold Surfaces , 2002 .

[39]  A. Nurmikko,et al.  Enhanced magnetooptical response in dumbbell-like Ag-CoFe2O4 nanoparticle pairs. , 2005, Nano letters.