SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 46: Ultrafast Magnetization Effects II

MA 46.4: Vortrag

Freitag, 31. März 2023, 10:15–10:30, HSZ 02

Magnetic field-dependent ultrafast control of an antiferromagnet — •Abeer Arora^1,6, Yoav Will Windsor², Sang-Eun Lee¹, Jit Sarkar¹, Kristin kliemt³, Ch. Schüssler- Langeheine⁴, Niko Pontius⁴, Cornelius Krellner³, Denis V. Vyalikh⁵, and Laurenz Rettig¹ — ¹FHI der MPG, Berlin — ²IOAP, TU Berlin — ³Phy. Inst., Goethe-Uni., Frankfurt am Main — ⁴HZB für Materialien und Energie GmbH, Berlin — ⁵DIPC, Basque, Spain — ⁶Fachbereich Physik, FU Berlin

Antiferromagnetic (AF) materials offer faster manipulation of spins, while making control of magnetic order challenging. A promising approach is utilizing the magnetic anisotropy (MA) to manipulate the spin arrangement on femtosecond timescales [1]. In addition, external magnetic fields can induce a spin flop (SF), providing an additional control knob for AF order. Understanding the interplay of these effects is of strong interest. Here, we present time-resolved resonant soft X-ray diffraction (RSXRD) experiments on the prototypical A-type antiferromagnet GdRh₂Si₂. We observe a coherent rotation of the AF arrangement followed by oscillations of the AF order due to light-induced change in the MA potential. Remarkably, upon increasing magnetic field, the frequency of the oscillations increases while the amplitude of reorientation upon photoexcitation decreases. These observations demonstrate the interplay of the MA potential and the SF field, and offer new ways towards deterministic control of AF spin order. [1]Windsor et al. Commun Phys 3, 139 (2020)