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Ultrafast laser excitation of spin waves and the permanent modification of the exchange bias interaction in
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View: Figures


Image of FIG. 1.
FIG. 1.

Magnetization oscillations measured by pump-probe TR-MOKE for with (a) Co and (b) Co for an applied field of along the direction of the exchange bias or pinning axis. Solid lines are fits to exponentially damped sinusoidals. The insets show discrete Fourier transforms, indicating single frequency peaks. (c) Applied field dependence of frequency of magnetization oscillations for Co (squares) and Co (circles). Note that the oscillations exist well beyond the saturation field of the Co. Solid lines are fits to a FMR equation described in the text. The open symbols are FMR data points taken for a frequency of . The inset shows static MOKE curves along pinning axis, for Co and Co.

Image of FIG. 2.
FIG. 2.

A simplified thermally activated model for switching, based on Xi (Ref. 17), assuming single-domain AF grains. (a) Energy diagram for AF spins aligned anti-parallel (uncoupled) and parallel (coupled) with the FM. The FM magnetization is saturated along the direction of 0°. Bottom [(b) and (c)]: Sketch of the AF spin states. The laser pump pulse provides the energy to overcome the energy barrier (b), resulting in a coherent rotation of AF spins to the opposite direction (c). This is illustrated in (c) for the antialigned or uncoupled AF spins, although the coupled spins may also be perturbed. This rotation launches oscillations in the FM layer. Some of the spin states are permanently switched.

Image of FIG. 3.
FIG. 3.

Right: Permanent “pinning” of exchange biased bilayer by application of ultrafast laser pulses, evidenced by the shift in the hysteresis loops measured by static MOKE [(b) and (d)]. Initial hysteresis loops are solid lines, shifted loops are dotted lines. The arrow indicates direction of shift. Left: [(a) and (c)] Coherent magnetization oscillations produced as a result of the laser pinning. Fits are to damped single frequency sinusoidals. For plots (a) and (b) an external field of is applied, for (c) and (d) a field of is applied.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ultrafast laser excitation of spin waves and the permanent modification of the exchange bias interaction in IrMn∕Co