Electronic and magnetic properties of α−FeGe2 films embedded in vertical spin valve devices
| Autor: | S Gaucher, Klaus Zollner, Lars Oppermann, Jaroslav Fabian, Manfred Ramsteiner, Dietmar Czubak, Holger T. Grahn, Jens Herfort |
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| Rok vydání: | 2020 |
| Předmět: |
Phase transition
Materials science Physics and Astronomy (miscellaneous) Condensed matter physics Spin valve 02 engineering and technology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology 01 natural sciences Inductive coupling Metal Condensed Matter::Materials Science Tetragonal crystal system Ferromagnetism visual_art Metastability 0103 physical sciences Electrode visual_art.visual_art_medium Condensed Matter::Strongly Correlated Electrons General Materials Science 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review Materials. 4 |
| ISSN: | 2475-9953 |
| Popis: | We studied metastable $\ensuremath{\alpha}\text{\ensuremath{-}}\mathrm{Fe}{\mathrm{Ge}}_{2}$, a layered tetragonal material, embedded as a spacer layer in spin valve structures with ferromagnetic ${\mathrm{Fe}}_{3}\mathrm{Si}$ and ${\mathrm{Co}}_{2}\mathrm{Fe}\mathrm{Si}$ electrodes. For both types of electrodes, spin valve operation is demonstrated with A metallic transport behavior of the $\ensuremath{\alpha}\text{\ensuremath{-}}\mathrm{Fe}{\mathrm{Ge}}_{2}$ spacer layer. The spin valve signals are found to increase with both temperature and spacer thickness, which is discussed in terms of a decreasing magnetic coupling strength between the ferromagnetic bottom and top electrodes. The temperature-dependent resistances of the spin valve structures exhibit characteristic features, which are explained by ferromagnetic phase transitions between 55 and 110 K. The metallic transport characteristics as well as the low-temperature ferromagnetism are found to be consistent with the results of first-principles calculations. |
| Databáze: | OpenAIRE |
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