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Reversal mechanisms of coupled bi-component magnetic nanostructures
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10.1063/1.4747446
/content/aip/journal/apl/101/8/10.1063/1.4747446
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/8/10.1063/1.4747446
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic diagrams showing details of structure after each fabrication step: (a) after deposition step done at an angle 45° away from normal incidence, (b) after deposition step done at normal incidence (0° deposition), (c) after photo-resist removal, and (d) after selective etching of Al2O3.

Image of FIG. 2.
FIG. 2.

SEM micrographs of (a) 3D resist profile for dots, (b) and (c) bi-component dots, (d) lens-shaped NiFe, (e) crescent-shaped Fe, (f) and (g) 3D resist profile for rectangular rings of width 350 nm and 650 nm, (h) bi-component rectangular rings, and (i) bi-component ring/wires structures.

Image of FIG. 3.
FIG. 3.

(a) Experimental MOKE loop measurements of bi-component dots (filled squares) and the normalized sum of lens-shaped NiFe and crescent-shaped Fe (filled circles). (b) The corresponding simulated hysteresis loops. The MOKE measurements and simulated loops for separate NiFe and Fe structures are shown as insets at the top left in (a) and (b). MFM images taken at remanence for bi-component dots after applying a negative saturating field of −3 kOe then cycling to (c) 0 Oe, (d) 200 Oe, (e) 250 Oe, (f) 300 Oe, (g) 350 Oe, (h) 400 Oe, (i) 500 Oe, and (j) +3 kOe. Simulated spin states of bi-component dots: (k) at negative saturation (−10 kOe), (l) at remanence (0 Oe), (m) after lens-shaped NiFe reversal (110 Oe), (n) after vortex nucleation (200 Oe), and (o) and (p) vortex annihilation (660 and 960 Oe). The shade in the color scale bar represents the component of magnetization in-plane along the field direction.

Image of FIG. 4.
FIG. 4.

(a) Experimental MOKE loop measurements of bi-component rectangular rings (filled squares) and bi-component ring/wires structure (filled circles). (b) The corresponding simulated hysteresis loops. MFM images taken at remanence after applying a negative saturating field of −3 kOe then cycling to 0 Oe and 250 Oe for bi-component rectangular rings (c), (e) and bi-component ring/wires structures (d), (f), respectively. Simulated spin states of bi-component rectangular rings showing (g) onion – O (0 Oe), (h) vortex – V (430 Oe), (i) reverse onion – RO states (760 Oe) and of bi-component ring/wires structure showing multi-step reversal (j)-(n) – (at 0, 90, 140, 350, and 440 Oe, respectively). The shade in the color scale bar represents the component of magnetization in-plane along the field direction.

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/content/aip/journal/apl/101/8/10.1063/1.4747446
2012-08-22
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Reversal mechanisms of coupled bi-component magnetic nanostructures
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/8/10.1063/1.4747446
10.1063/1.4747446
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