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Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 36: Magnetization and Demagnetization Dynamics III

MA 36.3: Vortrag

Mittwoch, 9. März 2016, 15:30–15:45, H34

Relevance of the exchange coupling in ultrafast demagnetization of ferromagnetic alloys — •Stefan Günther1,12, Carlo Spezzani2,11, Roberta Ciprian3, Cesare Grazioli2,4, Barbara Ressel4, Marcello Coreno2,5, Luca Poletto6, Paolo Miotti6, Maurizio Sacchi7,8,9, Giancarlo Panaccione3, Vojtěch Uhlíř10, Eric E. Fullerton10, Giovanni De Ninno2,4, Christian H. Back1, and Manfred Fiebig121University of Regensburg — 2Elettra Sincrotrone Trieste — 3IOM-CNR, Triest — 4University of Nova Gorica — 5CNR-IMIP, Rome — 6CNR-IFN, Padova — 7Sorbonne Universités, Paris — 8Centre national de la recherche scientifique, Paris — 9Synchrotron SOLEIL, Saint-Aubin — 10University of California, San Diego — 11University Paris Sud — 12ETH Zürich

We use element-resolved infrared-pump/extreme ultraviolet-probe experiments to disentangle the ultrafast interplay of magnetic alloys during ultrafast demagnetization. As paradigmatic examples, we investigate the cases of the FeRh alloy (crystalline and ordered), FeCo alloy (crystalline but disordered) and FeNi alloy (polycrystalline). All three systems reveal different dynamics for the alloy's components and a distinct time difference in the onset of the demagnetization is observed. The magnitude of this temporal delay is related to the interatomic exchange interaction for all three systems where the mismatch of the demagnetization traces decreases with stronger coupling.

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