| 1. |
- Kovalev, S., et al.
(author)
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Selective THz control of magnetic order : new opportunities from superradiant undulator sources
- 2018
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In: Journal of Physics D. - : IOP Publishing. - 0022-3727 .- 1361-6463. ; 51:11
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Journal article (peer-reviewed)abstract
- Recent advancements of accelerator technology enable the generation of carrier-envelope-phase stable THz pulses with high fields at adjustable high repetition rates. The appropriate choice of THz radiator allows generation of narrow-band, spectrally dense, multicycle THz transients of tunable THz frequency which are ideally suited to selectively excite low-energy excitations such as magnons or phonons. They also allow one to study the frequency dependence of nonresonant THz-field interactions with various order parameters with high dynamic range. In this paper, we discuss the future prospects of this new type of THz light source for studying the coherent control of magnetic order based on recent results.
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| 2. |
- Willems, F., et al.
(author)
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Magneto-Optical Functions at the 3p Resonances of Fe, Co, and Ni : Ab initio Description and Experiment
- 2019
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In: Physical Review Letters. - : American Physical Society. - 0031-9007 .- 1079-7114. ; 122:21
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Journal article (peer-reviewed)abstract
- We present experimental data and a complete theoretical description of the magneto-optical contributions to the complex refractive index in the extreme ultraviolet (XUV) range covering the 3p resonances of Fe, Co, and Ni. The direct comparison of the two allows us to conclude that many-body corrections to the ground state and local field effects are crucial for an accurate description of M-edge spectra. Our results are relevant for investigation of static magnetization, via XUV spectroscopy of multielement systems, as well as the dynamics of magnetization, as needed in the study of femtomagnetism and spintronics.
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| 3. |
- Schmising, C. vonKorff, et al.
(author)
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Nonlocal ultrafast demagnetization dynamics of Co/Pt multilayers by optical field enhancement
- 2015
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In: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 17
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Journal article (peer-reviewed)abstract
- The influence on ultrafast demagnetization dynamics of metallic nano-structured gratings deposited on thin films of magnetic Co/Pt multilayers is investigated by the time-resolved optical Kerr effect. Depending on the polarization of the pump pulse, a pronounced enhancement of the demagnetization amplitude is found. Calculation of the inhomogeneous optical field distribution due to plasmon interaction and time-dependent solutions of the coupled electron, lattice, and spin temperatures in two dimensions show good agreement with the experimental data, as well as giving evidence of non-local demagnetization dynamics due to electron diffusion.
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| 4. |
- von Korff Schmising, C., et al.
(author)
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Imaging Non-Local Magnetization Dynamics
- 2016
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In: Synchrotron Radiation News. - : Informa UK Limited. - 0894-0886 .- 1931-7344. ; 29:3, s. 26-31
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Journal article (peer-reviewed)abstract
- Many fundamental processes in magnetism take place on a nanometer length and sub-picosecond time scale. An important example of such phenomena in magnetism is ultrafast, spin-polarized transport of laser-excited hot electrons, which is now being recognized as playing a crucial role for novel spintronic devices and for optically induced magnetic switching. Recent experimental examples include the demonstration of all-optical helicity dependent control of spin-polarized currents at interfaces [1], the design of novel and efficient terahertz emitters [2], and nanoscale spin reversal in chemically heterogeneous GdFeCo driven by non-local transfer of angular momentum [3]. In particular, for advanced information technologies with bit densities already exceeding 1 terabit per square inch with bit cell dimensions of (15 × 38 nm2) [4], it is of fundamental importance to understand and eventually control the mechanisms responsible for optically induced spin dynamics on the nanoscale.
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