Spin–torque dynamics for noise reduction in vortex-based sensors
| Autor: | Claude Fermon, Ursula Ebels, Shinji Yuasa, Vincent Cros, Kay Yakushiji, Myriam Pannetier-Lecoeur, Akio Fukushima, Steffen Wittrock, Aurélie Solignac, Paolo Bortolotti, J. Moulin, Sumito Tsunegi, Hitoshi Kubota, Mafalda Jotta Garcia, Romain Lebrun |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Physics Condensed Matter - Mesoscale and Nanoscale Physics Physics and Astronomy (miscellaneous) Condensed matter physics Magnetoresistance Noise reduction FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Noise (electronics) Vortex state Vortex Magnetization Condensed Matter::Superconductivity Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences 0210 nano-technology Order of magnitude Spin-½ |
| Zdroj: | Applied Physics Letters. 118:122401 |
| ISSN: | 1077-3118 0003-6951 |
| DOI: | 10.1063/5.0040874 |
| Popis: | The performance of magnetoresistive sensors is today mainly limited by their 1/f low-frequency noise. Here, we study this noise component in vortex-based TMR sensors. We compare the noise level in different magnetization configurations of the device, i.e., vortex state or uniform parallel or antiparallel states. We find that the vortex state is at least an order of magnitude noisier than the uniform states. Nevertheless, by activating the spin-transfer-induced dynamics of the vortex configuration, we observe a reduction of the 1/f noise, close to the values measured in the AP state, as the vortex core has a lower probability of pinning into defect sites. Additionally, by driving the dynamics of the vortex core by a non-resonant rf field or current, we demonstrate that the 1/f noise can be further decreased. The ability to reduce the 1/f low-frequency noise in vortex-based devices by leveraging their spin-transfer dynamics thus enhances their applicability in the magnetic sensors' landscape. |
| Databáze: | OpenAIRE |
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