Ultrafast unidirectional spin Hall magnetoresistance driven by terahertz light field
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| Format: | Preprint |
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2024
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| author | Salikhov, Ruslan Ilyakov, Igor Reinold, Anneke Deinert, Jan-Christoph de Oliveira, Thales Ponomaryov, Alexey Prajapati, Gulloo Lal Pilch, Patrick Ghalgaoui, Ahmed Koch, Max Fassbender, Jürgen Lindner, Jürgen Wang, Zhe Kovalev, Sergey |
| author_facet | Salikhov, Ruslan Ilyakov, Igor Reinold, Anneke Deinert, Jan-Christoph de Oliveira, Thales Ponomaryov, Alexey Prajapati, Gulloo Lal Pilch, Patrick Ghalgaoui, Ahmed Koch, Max Fassbender, Jürgen Lindner, Jürgen Wang, Zhe Kovalev, Sergey |
| contents | The ultrafast control of magnetisation states in magnetically ordered systems is a key technological challenge for developing memory devices operable at picosecond timescales or terahertz (THz) frequencies. Despite significant efforts in ultrafast magnetic switching, convenient ultrafast readout of magnetic states remains under investigation. Currently, many experiments exploit magneto-optical effects for detecting magnetisation states, necessitating laser sources and optical components. However, energy-efficient and cost-effective electrical detection is preferred for practical applications. Unidirectional spin-Hall magnetoresistance (USMR) was proposed as a simple two-terminal geometry for the electrical detection of the magnetisation state in magnetic heterostructures. Here, we demonstrate that USMR is active at THz frequencies for picosecond time readouts, and can be initiated with light fields. We detect ultrafast USMR in various types of ferromagnet/heavy metal thin film heterostructures through THz second harmonic generation. Our studies, combined with temperature-dependent measurements of USMR, reveal a significant contribution from electron-magnon spin-flip scattering. This suggests possibilities for all-electrical detection of THz magnon modes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_16808 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Ultrafast unidirectional spin Hall magnetoresistance driven by terahertz light field Salikhov, Ruslan Ilyakov, Igor Reinold, Anneke Deinert, Jan-Christoph de Oliveira, Thales Ponomaryov, Alexey Prajapati, Gulloo Lal Pilch, Patrick Ghalgaoui, Ahmed Koch, Max Fassbender, Jürgen Lindner, Jürgen Wang, Zhe Kovalev, Sergey Mesoscale and Nanoscale Physics The ultrafast control of magnetisation states in magnetically ordered systems is a key technological challenge for developing memory devices operable at picosecond timescales or terahertz (THz) frequencies. Despite significant efforts in ultrafast magnetic switching, convenient ultrafast readout of magnetic states remains under investigation. Currently, many experiments exploit magneto-optical effects for detecting magnetisation states, necessitating laser sources and optical components. However, energy-efficient and cost-effective electrical detection is preferred for practical applications. Unidirectional spin-Hall magnetoresistance (USMR) was proposed as a simple two-terminal geometry for the electrical detection of the magnetisation state in magnetic heterostructures. Here, we demonstrate that USMR is active at THz frequencies for picosecond time readouts, and can be initiated with light fields. We detect ultrafast USMR in various types of ferromagnet/heavy metal thin film heterostructures through THz second harmonic generation. Our studies, combined with temperature-dependent measurements of USMR, reveal a significant contribution from electron-magnon spin-flip scattering. This suggests possibilities for all-electrical detection of THz magnon modes. |
| title | Ultrafast unidirectional spin Hall magnetoresistance driven by terahertz light field |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2408.16808 |