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Magnon magnetoresistance of NiFe nanowires: Size dependence and domain wall detection
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) (a) SEM micrograph of a 200 nm wide NiFe nanowire, with a set of Au contacts. (b) MR curves recorded on NiFe nanowires of various widths (indicated on the curves), for a field applied along the nanowires. The usual decrease of resistance associated to the magnetization reversal measured by AMR is changed to an increase of resistance for the smallest wires.

Image of FIG. 2.
FIG. 2.

(Color online) (a) MR curve of 50 nm wide NiFe nanowire, for a field applied along the wire axis. The arrows show the relative orientations of the magnetization and of the applied field. (b), (c) Schematic of the nanowire in a partially reversed state. The magnetization of the domains is either parallel (low resistivity) or anti-parallel to the applied field (high resistivity). The total resistivity of the nanowire depends on the proportion of these domains.

Image of FIG. 3.
FIG. 3.

(Color online) (a) SEM images of a 100 nm wide permalloy nanowire with a 40 nm wide constriction. (b) Minor MR loops measured between contacts 1 and 3. According to Eq. (1), the slope of the minor MR loop correspond to the value M/MS ∼ −0.52, i.e., to the reversal of around 76% ± 5% of the length of the wire. According to SEM observations, the position of the constriction is at 12.5 μm of the 16.7 μm wire segment (i.e., ∼74% ± 2% of the segment). (d) Minor loop of MR measured between contacts 2 and 3 showing the reversal of 42% ± 5% the length of the wire. The constriction is here at 3.3 μm of the 7.5 μm long segment (i.e., ∼44% ± 2% of the segment). (c) MFM image realized after the minor loop, showing that the DW is located on the constriction.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnon magnetoresistance of NiFe nanowires: Size dependence and domain wall detection