Experimental evidence of inertial dynamics in ferromagnets
| Autor: | Neeraj, Kumar, Awari, Nilesh, Kovalev, Sergey, Polley, Debanjan, Hagström, Nanna Zhou, Arekapudi, Sri Sai Phani Kanth, Semisalova, Anna, Lenz, Kilian, Green, Bertram, Deinert, Jan-Christoph, Ilyakov, Igor, Chen, Min, Bowatna, Mohammed, Scalera, Valentino, d'Aquino, Massimiliano, Serpico, Claudio, Hellwig, Olav, Wegrowe, Jean-Eric, Gensch, Michael, Bonetti, Stefano |
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| Rok vydání: | 2019 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | The understanding of how spins move at pico- and femtosecond time scales is the goal of much of modern research in condensed matter physics, with implications for ultrafast and more energy-efficient data storage. However, the limited comprehension of the physics behind this phenomenon has hampered the possibility of realising a commercial technology based on it. Recently, it has been suggested that inertial effects should be considered in the full description of the spin dynamics at these ultrafast time scales, but a clear observation of such effects in ferromagnets is still lacking. Here, we report the first direct experimental evidence of inertial spin dynamics in ferromagnetic thin films in the form of a nutation of the magnetisation at a frequency of approximately 0.6 THz. This allows us to evince that the angular momentum relaxation time in ferromagnets is on the order of 10 ps. Comment: 10 pages, 4 figures, 1 table |
| Databáze: | arXiv |
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