Coherent suppression of picosecond magnetization precession in the presence of spin waves in a Ni81Fe19 microstripe

We present the experimental and micromagnetic simulation studies of coherent suppression of picosecond magnetization precession in Ni81Fe19 (Permalloy) microstripes with widths of 5, 10, and 12 μm and length of 100 μm in the presence of multiple spin wave modes. The lateral confinement of the microstripes causes spin wave modes of frequencies adjacent to each other, and the local suppression of the modes was experimentally achieved with field pulses of slightly different durations but with same rise time and fall time. Micromagnetic simulations show that application of the pulse field causes a large angle (∼135°) reorientation of the magnetization, followed by a precession. At a particular value of pulse duration (suppression time), the magnetization returns back to the equilibrium position and suddenly becomes parallel to the effective field so that the torque on the magnetization vanishes. However, this applies to localized regions due to the presence of spin wave modes of slightly different frequencies...

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