Testing spin-flip scattering as a possible mechanism of ultrafast demagnetization in ordered magnetic alloys

Stefan Guenther , Carlo Spezzani , Roberta Ciprian , Cesare Grazioli , Barbara Ressel , Marcello Coreno , Luca Poletto , Paolo Miotti , Maurizio Sacchi (1) , Giancarlo Panaccione , Vojtech Uhlir , Eric E. Fullerton , Giovanni de Ninno , Christian H. Back

1 INSP - Institut des Nanosciences de Paris

We use element-resolved IR-pump/extreme ultraviolet-probe experiments to disentangle the ultrafast interplay of the magnetic sublattices of an ordered crystalline magnetic alloy. As a paradigmatic example, we investigate the case of the FeRh alloy, which shows a delayed response for the different components. Furthermore, a detailed time-resolved magneto-optic study shows that the data can be analyzed by only assuming Elliot-Yafet-like scattering, as the underlying mechanism for ultrafast demagnetization, resulting in an unexpected nonmonotonic dependence of the spin-flip rate, as a function of quenching.

Domaines: Matière Condensée [cond-mat]

Stefan Guenther, Carlo Spezzani, Roberta Ciprian, Cesare Grazioli, Barbara Ressel, et al.. Testing spin-flip scattering as a possible mechanism of ultrafast demagnetization in ordered magnetic alloys. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2014, 90 (18), pp.180407. ⟨10.1103/PhysRevB.90.180407⟩. ⟨hal-01240508⟩