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MA: Fachverband Magnetismus
MA 46: Poster II
MA 46.54: Poster
Donnerstag, 21. März 2024, 15:00–18:00, Poster C
Magnetic order-dependent ultrafast magnetization dynamics in 4f-based intermetallics — •Abeer Arora1, Yoav Will Windsor5, Sang-Eun Lee1, Daniela Zahn1, Victoria Taylor1, Hyein Jung1, Túlio de Castro1, Kristin Kliemt2, Ch. Schüssler- Langeheine3, Niko Pontius3, Cornelius Krellner2, Denis V. Vyalikh4, and Laurenz Rettig1 — 1FHI der MPG, Berlin — 2Phy. Inst., Goethe-Uni., Frankfurt am Main — 3HZB für Materialien und Energie, Berlin — 4DIPC, Basque, Spain — 5IOAP, TU Berlin
The speed of magnetic devices is limited by the dissipation channels available for Angular Momentum Transfer (AMT). While demagnetization in ferromagnets (FMs) requires AMT to the lattice or spin transport, antiferromagnets (AFMs) offer potentially faster demagnetization through inter-sublattice AMT. Owing to the limited understanding of such channels, especially in 4f-based Lanthanides, we study the ultrafast magnetization dynamics in the LnTm2Si2 series of intermetallics (with Ln=Lanthanide, Tm=transition metal), with similar crystal structure and RKKY-mediated magnetic orders. We employ time-resolved resonant soft X-ray diffraction (trRXD) to study AFM compounds (GdTm2Si2, Tm=Co, Rh, Ir, EuRh2Si2), and trXMCD on Eu based FMs (EuRu2P2, EuFe2P2). The Gd series reveals a scaling of AMT rate with the 5d spin polarization of the conduction electrons, underscoring conduction electrons as an extra tuning parameter for Ln-based devices. Furthermore, a comparison of the AFM dynamics with Eu-FMs provides information about the AMT to the lattice.
Keywords: Ultrafast magnetism; Spintronics; Lanthanide-based Magnetism; Resonant X-ray Diffraction, XMCD