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Ultrafast magnetization dynamics probed by anisotropic magnetoresistance
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View: Figures


Image of FIG. 1.
FIG. 1.

Magnetotransport devices. (a) Electron micrograph of a typical device with pulse line (PL) and sense line (SL). The buried Permalloy disk is marked by the dotted circle. (b) Currents and magnetic field configurations during the experiment. (c) AMR vs field angle for a full rotation of and (gray dots). The data fit the characteristic dependence (black line). The four points of maximum AMR sensitivity are marked by the arrows.

Image of FIG. 2.
FIG. 2.

Time resolved AMR signal. (a) Applied magnetic field pulse . [(b)–(e)] Time resolved voltage signal measured by the oscilloscope due to AMR change of the Permalloy disk. Gray dots: experimental data, black line: simulation. Static field amplitude . The data in (b)–(e) are taken at the four angles of maximum AMR sensitivity marked in Fig. 1(c). The angles are indicated. The spikes in the experimental data at the pulse inset are artifacts from reference subtraction.

Image of FIG. 3.
FIG. 3.

(Color online) Angular dependence of the AMR signal. Static field . Static field angle is varied from to 180° in 1° steps. (a) Measured data. (b) Simulated data. At 0° and 180° no AMR signal is observed. the measured frequency doubles due to oscillation about the AMR minimum (arrow).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ultrafast magnetization dynamics probed by anisotropic magnetoresistance