Structural, Magnetic and THz Emission Properties of Ultrathin Fe/L1 0 -FePt/Pt Heterostructures.
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| Title: | Structural, Magnetic and THz Emission Properties of Ultrathin Fe/L1 0 -FePt/Pt Heterostructures. |
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| Authors: | Locovei, Claudiu1 (AUTHOR), Torosyan, Garik2 (AUTHOR), Papaioannou, Evangelos Th.1,3 (AUTHOR), Crisan, Alina D.1,4 (AUTHOR), Beigang, Rene1,4 (AUTHOR), Crisan, Ovidiu1,2 (AUTHOR) |
| Source: | Nanomaterials (2079-4991). Jul2025, Vol. 15 Issue 14, p1099. 12p. |
| Subjects: | Heterostructures, Spin Hall effect, Ferromagnetic materials, Submillimeter waves, Platinum alloys, Magnetic coupling, Spintronics |
| Abstract: | Recent achievements in ultrafast spin physics have enabled the use of heterostructures composed of ferromagnetic (FM)/non-magnetic (NM) thin layers for terahertz (THz) generation. The mechanism of THz emission from FM/NM multilayers has been typically ascribed to the inverse spin Hall effect (ISHE). In this work, we probe the mechanism of the ISHE by inserting a second ferromagnetic layer in the form of an alloy between the FM/NM system. In particular, by utilizing the co-sputtering technique, we fabricate Fe/L10-FePt/Pt ultra-thin heterostructures. We successfully grow the tetragonal phase of FePt (L10-phase) as revealed by X-ray diffraction and reflection techniques. We show the strong magnetic coupling between Fe and L10-FePt using magneto-optical and Superconducting Quantum Interference Device (SQUID) magnetometry. Subsequently, by utilizing THz time domain spectroscopy technique, we record the THz emission and thus we the reveal the efficiency of spin-to-charge conversion in Fe/L10-FePt/Pt. We establish that Fe/L10-FePt/Pt configuration is significantly superior to the Fe/Pt bilayer structure, regarding THz emission amplitude. The unique trilayer structure opens new perspectives in terms of material choices for the future spintronic THz sources. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | Recent achievements in ultrafast spin physics have enabled the use of heterostructures composed of ferromagnetic (FM)/non-magnetic (NM) thin layers for terahertz (THz) generation. The mechanism of THz emission from FM/NM multilayers has been typically ascribed to the inverse spin Hall effect (ISHE). In this work, we probe the mechanism of the ISHE by inserting a second ferromagnetic layer in the form of an alloy between the FM/NM system. In particular, by utilizing the co-sputtering technique, we fabricate Fe/L10-FePt/Pt ultra-thin heterostructures. We successfully grow the tetragonal phase of FePt (L10-phase) as revealed by X-ray diffraction and reflection techniques. We show the strong magnetic coupling between Fe and L10-FePt using magneto-optical and Superconducting Quantum Interference Device (SQUID) magnetometry. Subsequently, by utilizing THz time domain spectroscopy technique, we record the THz emission and thus we the reveal the efficiency of spin-to-charge conversion in Fe/L10-FePt/Pt. We establish that Fe/L10-FePt/Pt configuration is significantly superior to the Fe/Pt bilayer structure, regarding THz emission amplitude. The unique trilayer structure opens new perspectives in terms of material choices for the future spintronic THz sources. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 20794991 |
| DOI: | 10.3390/nano15141099 |
