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Direct observation of the vortex core magnetization and its dynamics
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10.1063/1.2738186
/content/aip/journal/apl/90/20/10.1063/1.2738186
http://aip.metastore.ingenta.com/content/aip/journal/apl/90/20/10.1063/1.2738186
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color) Illustration of the sample setup and the stroboscopic measuring technique used for the time-resolved experiments. Panel (a) shows the vortex structure on a stripline. The yellow arrows illustrate the in-plane distribution of the magnetization forming a closed flux around the out-of-plane vortex core, depicted with a red arrow. The sample is placed perpendicularly with respect to the incoming x-ray flashes. An ac is sent through the stripline, generating an alternating magnetic field . This in-plane field induces a gyrotropic motion in the vortex structure which can be imaged by probing at specific phases of the applied field [panel (b)].

Image of FIG. 2.
FIG. 2.

(Color) Panel (a) shows the static configuration of a vortex structure (sample A: , thick) with a vortex core pointing up (left column) and down (right column). In the first row, images were taken for negative polarization of the photons while images with opposite polarization are shown in the second row. The “dichroic image” is depicted in the third row. A white or black spot can be observed, corresponding to a vortex core pointing up or down, respectively. The two dichroic images were subtracted from one another and a 3D image is given in panel (b) ( cut). The distributions along sections and are plotted in panel (c) with the corresponding Gaussian fits in order to estimate the size of the vortex core.

Image of FIG. 3.
FIG. 3.

(Color) Dynamic response of a vortex structure (sample B: , thick) by applying an in-plane alternating magnetic field (, ). Panel (a) shows the out-of-plane magnetic contrast of the Landau structure at different phases with respect to the external field. The images are cuts from the complete structure. The position at the different phases is depicted in panel (b) .

Image of FIG. 4.
FIG. 4.

(Color) Dynamic response of a vortex structure (sample A: , thick) due to an in-plane alternating magnetic field (, ) with a vortex core pointing up (upper row) and down (lower row). Panel (a) shows the out-of-plane magnetic contrast of the Landau structure at different phases of the external field (uneven phases are not shown). The images are cuts from the complete structure. The position at the different phases is depicted in panel (b) .

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/content/aip/journal/apl/90/20/10.1063/1.2738186
2007-05-18
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Direct observation of the vortex core magnetization and its dynamics
http://aip.metastore.ingenta.com/content/aip/journal/apl/90/20/10.1063/1.2738186
10.1063/1.2738186
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