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)).
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.
NRS spectra for 4.1 Å Fe thickness measured at 10 K without (bottom) and with (top) an external magnetic field Bext = 2 T applied along the film normal.
NRS spectra (black points) and fits (red lines) measured at 10 K without an external magnetic field for different Fe thicknesses.
Two interfacial fractions, f1 and f3 (shown as red and blue points, respectively), and the bulk component, f2 (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.
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 Bext = 2 T) for t = 8.8 Å; the blue line in b is the best fit obtained, assuming in-plane fluctuations of the magnetization.
Temperature dependence of the superparamagnetic relaxation frequency νspm displayed in the logarithmic scale. The dashed line through the data is a guide to the eye.
Bi(300 K)/Bi(10 K) = bi 300 as a function of the Fe thickness for components C1 (red points), C2 (black points), and C3 (blue points).
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