期刊
PHYSICAL REVIEW LETTERS
卷 125, 期 15, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.157201
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资金
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)
- European Research Council ERC [339813]
- ERC [852050]
- Russian Science Foundation [18-12-00022]
- RSF [18-12-00022, 16-12-10456]
- Russian Science Foundation [19-12-13020] Funding Source: Russian Science Foundation
- European Research Council (ERC) [852050] Funding Source: European Research Council (ERC)
The microscopic origin of ultrafast modification of the ratio between the symmetric (J) and antisymmetric (D) exchange interaction in antiferromagnetic iron oxides is revealed, using femtosecond laser excitation as a pump and terahertz emission spectroscopy as a probe. By tuning the photon energy of the laser pump pulse we show that the effect of light on the D/J ratio in two archetypical iron oxides FeBO3 and ErFeO3 is maximized when the photon energy is in resonance with a spin and parity forbidden d-d transition between the crystal-field split states of Fe3+ ions. The experimental findings are supported by a multielectron model, which accounts for the resonant absorption of photons by Fe3+ ions. Our results reveal the importance of the parity and spin-change forbidden, and therefore often underestimated, d-d transitions in ultrafast optical control of magnetism.
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