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Effect of cold working in a magnetic field on the shape of a ferromagnetic nanocontact
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Mechanically controlled break-junction device in magnetic field H. The device can be rotated around the center axis. (b) Conductance vs. piezo voltage of a polycrystalline yttrium wire during opening and closing the contact in zero magnetic field at T = 4.2 K. Inset shows a semilogarithmic plot of in the tunneling regime when closing the contact. (c) in a magnetic field  = 1 T applied parallel to the wire. Grey curve represents the data obtained in H = 0 with the piezo voltage shifted by −1.6 V for better comparison.

Image of FIG. 2.
FIG. 2.

Conductance curves vs. electrode distance for (a,b) polycrystalline, (c,d) a-, and (e,f) c-axis oriented dysprosium wires in zero field and in magnetic field applied parallel or perpendicularly to the long wire axis. Grey lines represent the midpoints between the curves for opening and closing.

Image of FIG. 3.
FIG. 3.

Calculated contact shapes according to the model of Ref. 17. (a)-(c) Double-logarithmic plot of the plastic deformation length vs. . Light-color lines represent data in zero field, dark-color lines represent data obtained in magnetic field, cf. Fig. 2. Dashed lines indicate . (d)-(f) Contact shape in parallel and perpendicular magnetic field.

Image of FIG. 4.
FIG. 4.

(a)-(c) Magnetization curves M(H) of Dy wires in magnetic fields oriented parallel and perpendicularly to the long wire axis. (d) Calculated anhysteretic M(H) and (e) curves (solid lines) for different stresses . Broken lines indicate the experimental M(H) curve of the polycrystalline Dy wire in parallel magnetic field.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effect of cold working in a magnetic field on the shape of a ferromagnetic nanocontact