Speed limits of the laser-induced phase transition in FeRh
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866910688412172288 |
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| author | Mattern, Maximilian Jarecki, Jasmin Arregi, Jon Ander Uhlíř, Vojtěch Rössle, Matthias Bargheer, Matias |
| author_facet | Mattern, Maximilian Jarecki, Jasmin Arregi, Jon Ander Uhlíř, Vojtěch Rössle, Matthias Bargheer, Matias |
| contents | We use ultrafast x-ray diffraction (UXRD) and the polar time-resolved magneto-optical Kerr effect (tr-MOKE) to study the laser-induced metamagnetic phase transition in two FeRh films with thicknesses below and above the optical penetration depth. In the thin film, we identify an intrinsic timescale for the light-induced nucleation of ferromagnetic (FM) domains in the antiferromagnetic material of $8\,\text{ps}$ that is substantially slower than the speed of sound. For the inhomogeneously excited thicker film, only the optically excited near-surface part transforms within $8\,\text{ps}$. For strong excitations we observe an additional slow rise of the FM phase, which we experimentally relate to a growth of the FM phase into the depth of the layer by comparing the transient magnetization in front- and backside excitation geometry. In the lower lying parts of the film, which are only excited via near-equilibrium heat transport, the FM phase emerges significantly slower than $8\,\text{ps}$ after heating above the transition temperature. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2305_02094 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Speed limits of the laser-induced phase transition in FeRh Mattern, Maximilian Jarecki, Jasmin Arregi, Jon Ander Uhlíř, Vojtěch Rössle, Matthias Bargheer, Matias Materials Science We use ultrafast x-ray diffraction (UXRD) and the polar time-resolved magneto-optical Kerr effect (tr-MOKE) to study the laser-induced metamagnetic phase transition in two FeRh films with thicknesses below and above the optical penetration depth. In the thin film, we identify an intrinsic timescale for the light-induced nucleation of ferromagnetic (FM) domains in the antiferromagnetic material of $8\,\text{ps}$ that is substantially slower than the speed of sound. For the inhomogeneously excited thicker film, only the optically excited near-surface part transforms within $8\,\text{ps}$. For strong excitations we observe an additional slow rise of the FM phase, which we experimentally relate to a growth of the FM phase into the depth of the layer by comparing the transient magnetization in front- and backside excitation geometry. In the lower lying parts of the film, which are only excited via near-equilibrium heat transport, the FM phase emerges significantly slower than $8\,\text{ps}$ after heating above the transition temperature. |
| title | Speed limits of the laser-induced phase transition in FeRh |
| topic | Materials Science |
| url | https://arxiv.org/abs/2305.02094 |