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Indication of vortex stabilization and buckling in circular shaped magnetic nanostructures
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10.1063/1.3427556
/content/aip/journal/jap/107/11/10.1063/1.3427556
http://aip.metastore.ingenta.com/content/aip/journal/jap/107/11/10.1063/1.3427556
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Schematic of the investigated triple layer system consisting of a Co layer, an insulating spacer layer and a permalloy layer. (b) SEM image of the experimentally investigated system after ion milling process. Exemplarily the sample with is shown. The diameter of the dots is approximately 300 nm. The white rings are edge effects of the SEM from residual resist.

Image of FIG. 2.
FIG. 2.

Hysteresis (Py minor) loops for the case of UA Co found by micromagnetic simulations with (a) , , (b) , , (c) , , and (d) , . Insets show corresponding spin structures of the Py layer in panel (a) at (upper) and −0.3 kOe (lower image), in (b) at and , in (c) at −0.3 and −0.45 kOe, in (d) at and . The color code “blue-white-red” refers to the x-component of the magnetization: .

Image of FIG. 3.
FIG. 3.

Phase diagrams of reversal modes depending on the Py and Co thickness for both, UA (a) and RA (b) Co. Letters mark different regions, i.e., A: reversal via direct switching (squares), B: occurrence of a vortex (full symbols), and C: buckling (open symbols). “B/C” in (a) marks a mixed phase (half filled symbols). In (b) reversal modes of both layers, Py (red diamonds) and Co (blue circles) are displayed.

Image of FIG. 4.
FIG. 4.

Hysteresis loops for the case of RA Co found by micromagnetic simulations with (a) , , (b) , , (c) , , and (d) , . Insets show corresponding spin structures of both layers, Py (red arrows, left hand side) and Co (blue arrows, right hand side). In panel (a) for Py at (upper) and 0 kOe (lower image) and for Co at (upper) and 0 kOe (lower image), in (b) for Py at and 0 kOe and for Co at 0 and −0.75 kOe, in (c) for Py at 0 and −0.15 kOe and for Co at and −0.15 kOe, in (d) for Py at and 0 kOe and for Co at and 0 kOe. The color code “blue-white-red” corresponds to the x-component of the magnetization: .

Image of FIG. 5.
FIG. 5.

Hysteresis loops measured by MOKE of triple stack dots with layer thicknesses (a) , , (b) and (c) , , (d) and (e) , . In (b) and (d), the magnetic field is applied parallel to the easy axis of the Co layer, in (c) and (e) the magnetic field is applied parallel to the hard axis.

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/content/aip/journal/jap/107/11/10.1063/1.3427556
2010-06-10
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Indication of vortex stabilization and buckling in circular shaped magnetic nanostructures
http://aip.metastore.ingenta.com/content/aip/journal/jap/107/11/10.1063/1.3427556
10.1063/1.3427556
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