A comparative study of spin Hall magnetoresistance in Fe2O3-based systems
| Autor: | Xingye Chen, Feng Pan, Y. J. Zhou, Xisong Zhou, Ruyi Chen, Hailin Bai, Cheng Song |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics Magnetoresistance Spintronics Bilayer General Physics and Astronomy 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Ferrimagnetism 0103 physical sciences Antiferromagnetism 0210 nano-technology Spin (physics) |
| Zdroj: | Journal of Applied Physics. 127:163904 |
| ISSN: | 1089-7550 0021-8979 |
| Popis: | Spin Hall magnetoresistance (SMR) provides a unique opportunity for the signal readout of magnetic ordering, especially for magnetic insulators. However, the magnitude of SMR signals is quite small, generally lower than one in a thousand, which is a persistent challenge in the field of spintronics. Here, we investigate SMR at room temperature in α-Fe2O3/Pt and γ-Fe2O3/Pt bilayers as well as the α-Fe2O3/Pt/γ-Fe2O3 trilayer, where α-Fe2O3 and γ-Fe2O3 are antiferromagnetic and ferrimagnetic materials, respectively. In contrast to the positive SMR in the γ-Fe2O3/Pt bilayer, an unprecedentedly large negative SMR with the magnitude of ∼0.35% is observed in the α-Fe2O3/Pt bilayer due to the spin-flop. The α-Fe2O3/Pt/γ-Fe2O3 trilayer shows features of a combination of positive and negative SMR. A comparative study of SMR in the Fe2O3 family not only enriches spin physics, but also makes Fe2O3 a versatile candidate in spintronic devices. |
| Databáze: | OpenAIRE |
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