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Mesoscopic conductance effects in InMnAs structures
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Image of FIG. 1.
FIG. 1.

(a) Resistivity of sample 1 shows its Curie temperature around . (b) Hall resistance measurement for sample 1 at 60 (dashed line), 40 (gray line), and (black line) showing magnetic hysteresis upon cooling, as expected for the paramagnetic to ferromagnetic transition. (c) Resistivity for sample 2 shows its Curie temperature lies . (d) Hall resistance for sample 2 at 50 (dashed line), 25 (gray line), and (black line). Inset: scanning electron microscopy image of etched sample.

Image of FIG. 2.
FIG. 2.

Normalized noise powers as a function of external magnetic field for (a) sample 1, and (b) sample 2 are shown at three different temperatures, (solid black lines), (solid light gray lines), and (dashed gray lines). The closed symbols are for perpendicular configuration, and the open symbols are for parallel configuration. The inset shows the temperature dependence of noise power for sample 2 at (solid symbol) and (open symbol). The error bars are not shown in these plots because they are comparable to the symbol size.

Image of FIG. 3.
FIG. 3.

MFUCF measurements of for sample 1 in (a) perpendicular and (c) parallel configurations were done using the five-terminal bridge technique. Measurements were performed at three different temperatures. 2, 4, and for the field span of . The curves are offset for clarity and a smooth background magnetoresistance due to imperfect symmetry between the two sides of the bridge is subtracted from each curve. (b) and (d) are zoomed-in version for the marked area in (a) and (c), respectively.


Generic image for table
Table I.

Parameters for both samples used in the experiments. Resistivity, carrier density, and mobility are calculated from the sample resistance and the Hall resistance measured at , . All samples have wires of width and thickness is , and composed of six segments with length of each.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Mesoscopic conductance effects in InMnAs structures