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Confinement of magnetic nanoparticles inside multisegmented nanotubes by means of magnetic field gradients
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10.1063/1.3676285
/content/aip/journal/jap/111/1/10.1063/1.3676285
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/1/10.1063/1.3676285
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Illustration of the different tube geometries considered, depicting the magnetic (light) and non-magnetic (dark) regions. Here, we show tubes with  = 1, 2, and 3 segments, separated by non-magnetic spacers of thickness . The arrows (solid and open) represent the magnetization direction in each segment.

Image of FIG. 2.
FIG. 2.

(Color online) Magnetic field along the -axis of single tubes, , made of (a) iron (solid lines) and (b) nickel (dashed line). The discontinuities of the magnetization at the ends generate peaks on the field profile that attract the magnetic particle, impeding its encapsulation for longer times.

Image of FIG. 3.
FIG. 3.

(Color online) Magnetic field components along the tube’s axis and on the internal walls for double tubes ( segments) with (a) parallel and (b) anti-parallel magnetic configuration separated by a thick spacer.

Image of FIG. 4.
FIG. 4.

(Color online) Typical trajectory inside a double tube () in a parallel configuration. We show one every 5 steps for the sake of visualization. (a) Frontal profile; (b) cross sectional view over the spacer; (c) cross sectional view over the magnetic segment.

Image of FIG. 5.
FIG. 5.

(Color online) Typical trajectory inside a double tube () in an anti-parallel configuration. We show one every 35 steps for clarity. (a) Frontal profile; (b) cross sectional view over the spacer; (c) cross sectional view over the magnetic segment.

Image of FIG. 6.
FIG. 6.

(Color online) Magnetic field along the tube’s axis as obtained from Eq. (2) for tubes with different number of segments using (a) parallel and (b) anti-parallel magnetic configuration. The spacer thickness was .

Image of FIG. 7.
FIG. 7.

(Color online) Magnetic field near the tube’s internal wall as obtained from Eq. (2) for tubes with different number of segments using (a) parallel and (b) anti-parallel magnetic configuration. The spacer thickness was .

Image of FIG. 8.
FIG. 8.

(Color online) Magnetic field along the tube’s axis as obtained from Eq. (2) for tubes with different number of segments using (a) parallel and (b) anti-parallel magnetic configuration. The spacer thickness was .

Image of FIG. 9.
FIG. 9.

(Color online) Magnetic field near the tube’s internal wall as obtained from Eq. (2) for tubes with different number of segments using (a) parallel and (b) anti-parallel magnetic configuration. The spacer thickness was .

Image of FIG. 10.
FIG. 10.

(Color online) Magnetic field components along the tube’s axis for triple () segmented tubes with parallel and anti-parallel configurations and different materials. (a) Parallel Fe/Fe/Fe and Fe/Ni/Fe; (b) anti-parallel Fe/Fe/Fe and Fe/Ni/Fe; (c) parallel Ni/Ni/Ni and Ni/Fe/Ni; (d) anti-parallel Ni/Ni/Ni and Ni/Fe/Ni. All spacers are thick.

Image of FIG. 11.
FIG. 11.

(Color online) Dependence of the average departure time on the relative number of Ni and Fe segments. The values of are shown relative to mcs, which is the average departure time for a non-segmented Fe tube. The statistical error bars are smaller than the points.

Image of FIG. 12.
FIG. 12.

(Color online) ratio between the departure times in multisegmented and simple tubes as a function of the number of segments . mcs is the average departure time for a single () Fe tube. The statistical error bars are smaller than the points, and the dotted lines are guides for the eyes. Panel (a) corresponds to the results obtained using as spacer thickness and (b) to .

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/content/aip/journal/jap/111/1/10.1063/1.3676285
2012-01-12
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Confinement of magnetic nanoparticles inside multisegmented nanotubes by means of magnetic field gradients
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/1/10.1063/1.3676285
10.1063/1.3676285
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