Interface reflectivity of a superdiffusive spin current in ultrafast demagnetization and THz emission
arXiv:1911.08796 · doi:10.1103/PhysRevB.101.014435
Abstract
The spin- and energy-dependent interface reflectivity of a ferromagnetic (FM) film in contact with a nonmagnetic (NM) film is calculated using a first-principles transport method and incorporated into the superdiffusive spin transport model to study the femtosecond laser-induced ultrafast demagnetization of Fe|NM and Ni|NM (NM= Au, Al & Pt) bilayers. By comparing the calculated demagnetization with transparent and real interfaces, we demonstrate that the spin-dependent reflection of hot electrons has a noticeable influence on the ultrafast demagnetization and the associated terahertz electromagnetic radiation. In particular, a spin filtering effect is found at the Fe|NM interface that increases the spin current injected into the NM metal, which enhances both the resulting demagnetization and the resulting THz emission. This suggests that the THz radiation can be optimized by tailoring the interface, indicating a very large tunability.
arXiv comment14 pages, 16 figures
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- Ultrafast demagnetization in ferromagnetic materials: Origins and progress
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- Néel-Vector Switching and THz Spin-Wave Excitation in MnAu due to Femtosecond Spin-Transfer Torques
- Element resolved evidence of superdiffusive terahertz spin current arising from ultrafast demagnetization process
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- Ultrafast magnetization enhancement and spin current injection in magnetic multilayers by exciting the nonmagnetic metal
- Optimizing spin-based terahertz emission from magnetic heterostructures