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Manipulation of magnetization states of ferromagnetic nanorings by an applied azimuthal Oersted field
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10.1063/1.3599714
/content/aip/journal/apl/98/24/10.1063/1.3599714
http://aip.metastore.ingenta.com/content/aip/journal/apl/98/24/10.1063/1.3599714
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Schematic of the experiment setup. (b) A current-voltage plot generated directly from the experimental setup in (a).

Image of FIG. 2.
FIG. 2.

(a) Topographic AFM image of two identically designed sets of symmetric rings. Ring 2 and 4 have 300 nm arm width and 1200 nm outer diameter, while 1 and 3 have 300 nm arm width and 800 nm outer diameter. (b) MFM image of the initial remanent states of rings in (a), revealing the onion state as indicated schematically in (c) and (d) for rings 2 and 4. The double red dashed line indicates that we apply a stronger current and CW field (40 mA and 178 Oe) through the ring center, while the single red dashed line indicates a smaller current (30 mA, 133 Oe). (e) MFM image after applying currents, revealing ring 2 is in a vortex state while ring 4 remains in an intermediate state, and rings 1 and 3 are unchanged. (f) Schematic of the state of ring 2, and (g) ring 4. (h) Topographic AFM image of a third set of symmetric rings. (i) MFM image of initial remanent onion states, indicated schematically in (j) for ring 6. Blue circles indicate current direction opposite to red circles. (k) MFM image after applying a −25 mA (111 Oe) CCW current, revealing a 360° DW, shown schematically in (l). (m) MFM image after applying a stronger current (−35 mA and 156 Oe), revealing the vortex state, indicated schematically in (n).

Image of FIG. 3.
FIG. 3.

(a) Topographic AFM image of a set of three asymmetric rings. The offset from the center of the ring is 50 nm and outer diameters of three rings are 770 nm, 870 nm, and 1050 nm, respectively. (b) MFM images of initial onion states of the rings at zero field, indicated schematically for rings 2 and 3 in (c) and (d). Blue and red dashed lines indicate out-of-plane and into-plane applied currents, respectively. (e) MFM image after applying −18 mA (97 Oe, CCW) to ring 2 and 19 mA (90 Oe CW) to ring 3, showing different light/dark contrast indicating opposite vortex chiralities, as shown schematically in (f) and (g). (h) MFM image of ring 1 and 2 with initial CW vortex states at zero field, shown schematically in (i). (j) MFM images of rings in (h) after −30 mA (191 Oe, CCW) is applied to ring 1, revealing switched vortex chirality, as indicated schematically in (k). (l) MFM images of ring 1 and 2 with initial CCW vortex states at zero field, shown schematically in (m). (n) MFM image after applying 30 mA (162 Oe, CW) to ring 2, revealing switched chirality, as shown schematically in (o). (p) MFM image of ring 3 with initial CW vortex states at zero field, shown schematically in (q). (r) MFM image of ring 3 after −18 mA (85 Oe CCW) is applied, revealing an intermediate state with a 360° DW, indicated schematically in (s). (t) Simulated MFM image of a permalloy asymmetric ring in CW vortex state. (u) Simulated MFM image of a permalloy asymmetric ring in CCW vortex state, revealing reversed light/dark contrast.

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/content/aip/journal/apl/98/24/10.1063/1.3599714
2011-06-16
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Manipulation of magnetization states of ferromagnetic nanorings by an applied azimuthal Oersted field
http://aip.metastore.ingenta.com/content/aip/journal/apl/98/24/10.1063/1.3599714
10.1063/1.3599714
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