1887
banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
Unravelling the effect of interparticle interactions and surface spin canting in γ-Fe2O3@SiO2 superparamagnetic nanoparticles
Rent:
Rent this article for
USD
10.1063/1.3583652
/content/aip/journal/jap/109/11/10.1063/1.3583652
http://aip.metastore.ingenta.com/content/aip/journal/jap/109/11/10.1063/1.3583652

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Schematic representation of the unit cell of maghemite.

Image of FIG. 2.
FIG. 2.

(Color online) (a) Schematic representation of the silica coating steps. (b) TEM images (from Ref. 12) and schematic representation of the γ-Fe2O3 nanoparticles before and after the silica coatings.

Image of FIG. 3.
FIG. 3.

(Color online) Mössbauer spectra of (a) uncoated γ-Fe2O3 MNPs measured at RT and (b) γ-Fe2O3@SiO2−2 MNPs (silica shell thickness of ∼110 nm) measured at RT.

Image of FIG. 4.
FIG. 4.

(Color online) (a) Mössbauer spectrum of uncoated γ-Fe2O3 MNPs measured at 77 K. (b) Hyperfine field distribution.

Image of FIG. 5.
FIG. 5.

(Color online) (a) Temperature dependence of the normalized magnetization [M/M FC (5K)] for ZFC and FC curves. (b) Reciprocal susceptibility curves (normalized ZFC).

Image of FIG. 6.
FIG. 6.

(Color online) Magnetization vs applied magnetic field of γ-Fe2O3 nanoparticles at 5 K. Inset: scheme of the dead layer in the external surface of the MNPs.

Tables

Generic image for table
Table I.

Selected Mössbauer parameters at 300 K for 6.5 nm γ-Fe2O3 nanoparticles uncoated and coated with silica. δ is the isomer shift with respect to metallic iron at RT, Δ is the quadrupolar shift, Γ is the linewidth (full-width at half maximum), B hf is the hyperfine field, and Area is the area below the spectrum.

Loading

Article metrics loading...

/content/aip/journal/jap/109/11/10.1063/1.3583652
2011-06-15
2014-04-20
Loading

Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Unravelling the effect of interparticle interactions and surface spin canting in γ-Fe2O3@SiO2 superparamagnetic nanoparticles
http://aip.metastore.ingenta.com/content/aip/journal/jap/109/11/10.1063/1.3583652
10.1063/1.3583652
SEARCH_EXPAND_ITEM