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Magnetism of ultrathin Fe films in MgO/Fe/MgO in epitaxial structures probed by nuclear resonant scattering of synchrotron radiation
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10.1063/1.4809657
/content/aip/journal/jap/113/21/10.1063/1.4809657
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/21/10.1063/1.4809657
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Figures

Image of FIG. 1.
FIG. 1.

Representative longitudinal (left panel) and polar (right panel) MOKE loops measured at room temperature for Fe thicknesses of 5.5 Å ((a) and (b)) and 8.5 Å ((c) and (d)).

Image of FIG. 2.
FIG. 2.

Geometry of the grazing incident nuclear resonance scattering experiment: the angles θ and φ give relative orientation of the magnetization M to the incident synchrotron beam wave vector k.

Image of FIG. 3.
FIG. 3.

NRS spectra for 4.1 Å Fe thickness measured at 10 K without (bottom) and with (top) an external magnetic field B = 2 T applied along the film normal.

Image of FIG. 4.
FIG. 4.

NRS spectra (black points) and fits (red lines) measured at 10 K without an external magnetic field for different Fe thicknesses.

Image of FIG. 5.
FIG. 5.

Two interfacial fractions, f and f (shown as red and blue points, respectively), and the bulk component, f (shown as black points) as a function of the Fe film thickness; the dashed lines show the predicted behavior for perfect layer-by-layer growth.

Image of FIG. 6.
FIG. 6.

NRS spectra (black points) and fits (red lines) as a function of temperature (a—100 K, b—200 K, c—300 K, d—300 K at B = 2 T) for t = 8.8 Å; the blue line in b is the best fit obtained, assuming in-plane fluctuations of the magnetization.

Image of FIG. 7.
FIG. 7.

Temperature dependence of the superparamagnetic relaxation frequency displayed in the logarithmic scale. The dashed line through the data is a guide to the eye.

Image of FIG. 8.
FIG. 8.

B(300 K)/B(10 K) = b as a function of the Fe thickness for components C (red points), C (black points), and C (blue points).

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/content/aip/journal/jap/113/21/10.1063/1.4809657
2013-06-07
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetism of ultrathin Fe films in MgO/Fe/MgO in epitaxial structures probed by nuclear resonant scattering of synchrotron radiation
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/21/10.1063/1.4809657
10.1063/1.4809657
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