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Nanowire arrays, surface anisotropy, magnetoelastic effects and spintronics
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View: Figures


Image of FIG. 1.
FIG. 1.

Measured resonance field (red error bars) for all diameters (15, 50, 80, and 100 nm) versus angle at a frequency of 9.4 GHz and at room temperature. The fit is the continuous curve in black. The angle for which is minimal indicates the EA orientation: It is 90° for 15 nm and 0° for all larger diameters.

Image of FIG. 2.
FIG. 2.

Room temperature theoretical resonance frequency as a function of magnetic field for the 15 nm (top graph) and 100 nm (bottom graph) diameter with angles: and . The horizontal line is the FMR measurement frequency of 9.4 GHz. The low-field quarter of a circle shaped curve is the unsaturated case where the equilibrium magnetization angle is different from . It can be expressed as . In the 15 nm, we have a high field mode for and a low field mode at as shown in Fig. 1. It is exactly the opposite for diameter d = 100 nm as observed in Fig. 1 for all 50 nm.

Image of FIG. 3.
FIG. 3.

Experimental (crosses) and theoretical (lines) resonance field accounting for magnetoelastic contribution as a function of [4.2 K, 300 K] for the 15 nm (top graph) and 100 nm (bottom graph) diameter with both angles: (red crosses for experiment and green lines for theory) and (blue crosses for experiment and magenta lines for theory). The cyan () and yellow () curves enclosed between the theoretical and experimental results do not contain the magnetoelastic correction term. measurement error bars are not shown here for clarity; they are displayed in Fig. 1.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Nanowire arrays, surface anisotropy, magnetoelastic effects and spintronics