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MA: Magnetismus

MA 28: Spindynamik / Ummagnetisierungsvorg
änge

MA 28.11: Vortrag

Donnerstag, 11. März 2004, 17:45–18:00, H23

All optical probe of coherent spin waves in exchange bias systems — •B. Beschoten¹, A. Tillmanns¹, S. Oertker¹, G. Güntherodt¹, I.K. Schuller², C. Leighton³, and J. Nogués⁴ — ¹2. Physikalisches Institut, RWTH Aachen, 52056 Aachen — ²Department of Physics, UC San Diego — ³Department of Chemical Engineering and Materials Science, University of Minnesota — ⁴Departament de Fisica, Universitat Autònoma de Barcelona

Time-resolved Kerr rotation is used to generate and to probe coherent spin waves in exchange biased ferro-/antiferromagnetic bilayer films of Fe/MnF₂. The exchange bias results from an unidirectional anisotropy which is established below the Néel temperature of the antiferromagnetic layer and can be identified as a shift of the magnetic hysteresis loop. In time-resolved Kerr rotation, an ultrashort laser pump pulse generates an unidirectional anisotropy field pulse which triggers coherent precession of the magnetization in the ferromagnetic layer. This coherent precession is monitored by a time-delayed laser probe pulse yielding a quantitative method to study magnetic anisotropy, ultrafast switching and damping phenomena.

Work supported by DFG through SPP 1133, grant no. BE 2441/2-1