Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 35: Poster 2

MA 35.24: Poster

Donnerstag, 8. September 2022, 16:00–18:00, P4

Magnetic field-dependent ultrafast control of an antiferromagnet — •A. Arora^1,4, Y.W. Windsor⁶, S.E. Lee¹, J. Sarkar¹, K. Kliemt³, Ch. Schüssler-Langeheine², N. Pontius², C. Krellner³, D.V. Vyalikh⁵, and L. Rettig¹ — ¹FHI der MPG, Berlin — ²HZB für Materialien und Energie GmbH, Berlin — ³Phy. Inst., Goethe-Uni., Frankfurt am Main — ⁴Fach. Phy., FU Berlin — ⁵DIPC, Basque, Spain — ⁶IOAP, TU Berlin

Antiferromagnets, due to their zero net magnetization, offer faster manipulation of spins and more robust devices. But this also makes the interaction with magnetic order challenging. One way to achieve this is to utilize the magnetic anisotropy to manipulate the spin arrangement which we demonstrated recently using ultrafast optical excitation [1]. For practical applications, understanding the interaction of this effect with external magnetic fields is of strong interest. To this end, we perform time-resolved resonant soft X-ray diffraction in the prototypical A-type antiferromagnet GdRh₂Si₂. Consistent with our previous study, we observe a coherent rotation of the antiferromagnetic (AF) arrangement of Gd 4f spins followed by oscillations of the AF order as a consequence of a light-induced change in the anisotropy potential. Surprisingly, upon increasing magnetic field, the frequency of the oscillations as well as the extent of demagnetization upon photoexcitation increases. These observations indicate a change in the magnetic anisotropy potential and may offer a new way towards deterministic control of spin order using combined electromagnetic and magnetic fields. [1] Windsor et al. Commun Phys 3, 139 (2020)