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SM ISO690:2012 OVCHARENKO, S., YAKUSHENKOV, P., ILYIN, Nikita, BREKHOV, Kirill, SEMENOVA, E., MISHINA, E.. All-optical magnetization switching by a single femtosecond laser pulse in DyFeCo thin films using a microstructured fiber. In: Materials Science and Condensed Matter Physics, Ed. 9, 25-28 septembrie 2018, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2018, Ediția 9, p. 220. |
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Materials Science and Condensed Matter Physics Ediția 9, 2018 |
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Conferința "International Conference on Materials Science and Condensed Matter Physics" 9, Chișinău, Moldova, 25-28 septembrie 2018 | |||||
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CZU: 538.9+539.2+66 | |||||
Pag. 220-220 | |||||
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Continuous increase in the volume of stored and processed information creates a need to improve the characteristics of modern storage devices: the speed of writing and reading, the density of information storage. The currently used magnetic memory technologies make it possible to achieve a recording time of one bit on the order of hundreds of picoseconds [1]. Moreover, the use of ultrashort strong magnetic field pulses of less than 2 ps duration is incapable of switching the magnetization in the medium to a stable state [2]. The presence of a fundamental limit and technological difficulties in achieving it, stimulate the search for faster and more energy efficient approaches to magnetic recording of information. One such approach is the use of femtosecond laser pulses to control the direction of magnetization in the medium. At present, all-optical control of the magnetization has been demonstrated in various materials: thin films of rare-earth transition-metal alloys, dielectrics, including orthoferrites and garnets, semiconductors and heterostructures. Thin films of rare-earth transition-metal alloys are widely used in the production of magneto-optical disks, and are also used in magnetic memory technologies [3]. In this group of materials, the possibility of influencing the magnetic state of the medium by a femtosecond laser pulse was first demonstrated in [4], and a 180 ° reversal of the magnetization direction in a thin GdFeCo film by a femtosecond laser pulse was demonstrated in [5]. At the present time, various methods of realizing magnetic memory based on the all-optical switching of the magnetic state of the medium are actively being investigated [6]. The problem may be be the delivery of femtosecond laser radiation to the medium. One of the solutions to this problem can be the use of hollow-core fibers [7], allowing the transmission of femtosecond radiation without distortion of polarization and pulse duration. In our work, we demonstrated experimentally the local all-optical magnetization switching by single 35 fs linearly and circularly polarized laser pulses that passed through revolver hollow core optical fibers in the thin ferrimagnetic film of the rare-earth transition metal alloy DyFeCo without the application of an external magnetic field. The minimum power density magnetization switching was about 13.6 mJ / cm2. |
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