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  Yamamoto, K.; Tsuyama, T.; Ito, S.; Takubo, K.; Matsuda, I.; Pontius, N.; Schüßler-Langeheine, C.; Minohara, M.; Kumigashira, H.; Yamasaki, Y.; Nakao, H.; Murakami, Y.; Katase, T.; Kamiya, T.; Wadati, H.: Photoinduced transient states of antiferromagnetic orderings in La_1/3Sr_2/3FeO₃ and SrFeO_3-δ thin films observed through time-resolved resonant soft x-ray scattering. New Journal of Physics 24 (2022), p. 043012/1-9

10.1088/1367-2630/ac5f31
Open Access Version

Abstract:
The relationship between the magnetic interaction and photoinduced dynamics in antiferromagnetic perovskites is investigated in this study. In La1/3Sr2/3FeO3 thin films, commensurate spin ordering is accompanied by charge disproportionation, whereas SrFeO3−δ thin films show incommensurate helical antiferromagnetic spin ordering due to increased ferromagnetic coupling compared to La1/3Sr2/3FeO3. To understand the photoinduced spin dynamics in these materials, we investigate the spin ordering through time-resolved resonant soft x-ray scattering. In La1/3Sr2/3FeO3, ultrafast quenching of the magnetic ordering within 130 fs through a nonthermal process is observed, triggered by charge transfer between the Fe atoms. We compare this to the photoinduced dynamics of the helical magnetic ordering of SrFeO3−δ. We find that the change in the magnetic coupling through optically induced charge transfer can offer an even more efficient channel for spin-order manipulation