Ultrafast demagnetization of ferromagnetic semiconductor InMnAs by dual terahertz and infrared excitations
| Autor: | Hiro Munekata, K. A. Grishunin, Alexey Kimel, E. A. Mashkovich |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Physics and Astronomy (miscellaneous) Condensed matter physics Condensed Matter::Other business.industry Terahertz radiation Demagnetizing field 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Molecular electronic transition Condensed Matter::Materials Science Semiconductor Atomic electron transition Condensed Matter::Superconductivity Spectroscopy of Solids and Interfaces 0103 physical sciences Charge carrier 0210 nano-technology business Ultrashort pulse Excitation |
| Zdroj: | Applied Physics Letters, 117, 12, pp. 1-5 Applied Physics Letters, 117, 1-5 |
| ISSN: | 0003-6951 |
| Popis: | Subpicosecond pumping of ferromagnetic semiconductor InMnAs in the ranges of intra- and interband electronic transitions can result in an efficient demagnetization of the medium up to 60% of the initial magnetic moment. Here, we report about the efficiency of ultrafast demagnetization by a duo of terahertz and infrared pulses that trigger intra- and interband electronic transitions, respectively. Varying the intensities of the pulses and the delay between them, we study the degree of demagnetization caused by the pulse duo. It is shown that the result of the excitation does not depend on the pulse sequence. Our findings indicate that both intra- and interband electronic transitions result in ultrafast demagnetization of the semiconductor via the very same mechanism, which evolves at a ps timescale. Independent of the origin of the electronic transition, ultrafast demagnetization is a result of a temperature increase in the free charge carriers (holes). |
| Databáze: | OpenAIRE |
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