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Terahertz spinplasmonics in random ensembles of Ni and Co microparticles
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10.1063/1.4765028
/content/aip/journal/jap/112/10/10.1063/1.4765028
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/10/10.1063/1.4765028

Figures

Image of FIG. 1.
FIG. 1.

Circuit analogy for the interaction between a THz electromagnetic pulse and a subwavelength metallic particle. Here, is a surface current density and the particle impedance is magnetic field dependent such that is a function of the spherical coordinates and . Note that relative dimensions are not to scale.

Image of FIG. 2.
FIG. 2.

Scanning electron microscope images of (a) Ni and (b) Co particles. Note that the particles are spatially dispersed for imaging purposes only.

Image of FIG. 3.
FIG. 3.

VSM measurements of an ensemble of (a) Ni and (b) Co particles. The Ni sample saturates at an applied magnetic field strength of approximately ±200 mT, whereas the Co sample magnetization appears to saturate at a much larger field. Both samples show negligible hysteresis and remanence.

Image of FIG. 4.
FIG. 4.

THz time-domain waveforms transmitted through the Ni ensemble ((a) and (b)) and Co ensemble ((c) and (d)) when the magnetic field is applied perpendicular ((a) and (c)) and parallel ((b) and (d)) to the THz electric field. The solid lines correspond to zero applied magnetic field while the dashed lines correspond to an applied field of +500 mT.

Image of FIG. 5.
FIG. 5.

Delay times of THz pulses transmitted through the Ni (a) and Co (b) ensembles for (solid) and (dashed). The black arrows in (a) show the sweep direction of the magnetic field. A representative error bar for each curve is shown on the data point at +500 mT. Note that the lines are meant to guide the eye.

Image of FIG. 6.
FIG. 6.

Peak amplitude of the THz electric field transmitted through the Ni (a) and Co (b) ensembles for (solid) and (dashed). The black arrows in (a) show the sweep direction of the magnetic field. A representative error bar for each curve is shown on the data point at +500 mT. Note that the lines are meant to guide the eye.

Image of FIG. 7.
FIG. 7.

Peak amplitude of the THz electric field transmitted through the Ni (a) and Co (b) ensembles with no coating (black, solid), Ag coating (blue, dashed), Al coating (green, dotted), and Au coating (red, dashed-dotted) where each coating is 45 nm thick. The black arrows in (a) show the sweep direction of the magnetic field. A representative error bar for each curve is shown on the data point at +500 mT. Note that the lines are meant to guide the eye.

Tables

Generic image for table
Table I.

Samples under investigation for the spin plasmonic experiment. The first element represents the particle while the second element represents the deposited thin-film layer. The numbers in brackets correspond to the thickness of the non-ferromagnetic metal layer in nm.

Generic image for table
Table II.

Change in the electric field amplitude of the THz waveforms transmitted through each sample under the influence of a +500 mT magnetic field, relative to the transmitted amplitude of particles with no N film.

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/content/aip/journal/jap/112/10/10.1063/1.4765028
2012-11-21
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Terahertz spinplasmonics in random ensembles of Ni and Co microparticles
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/10/10.1063/1.4765028
10.1063/1.4765028
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