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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2511.18443 |
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| _version_ | 1866915634613321728 |
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| author | Longo, Emanuele Fontcuberta, Josep Vavassori, Paolo |
| author_facet | Longo, Emanuele Fontcuberta, Josep Vavassori, Paolo |
| contents | Charge to spin (orbital) momentum conversion phenomena enclose great potential for advancing applications in spin/orbitronics. Although current-induced magnetic moment accumulation is crucial both for fundamental understanding and practical applications, direct quantifications are scarce. Optical polarization measurements, namely magneto-optical Kerr rotation (MOKE) ($θ_K$), have been used to get direct evidence of magnetic accumulation perpendicular to a current flow density ($J$) in late transition metals (Pt) as well as in light transition elements (Ti, Cr), and used to conclude evidence of spin or orbital momentum accumulation. However, discrepancies of the reported $θ_K/J$ values, exceeding one order of magnitude, together with early claims that conventional MOKE experiments were not a suitable tool, is prompting revisions of methods and results. Here, we report on a new methodology for MOKE measurements that solves known bottlenecks. We obtain a sensitivity of $(354 \pm 27)$ nV/nrad and use the designed protocol to measure $|θ_K^S/J| = (7.92 \pm 1.94)$ nrad/$(10^7$ A/cm$^2)$ and $|θ_K^P/J| = (6.89 \pm 1.74)$ nrad/$(10^7$ A/cm$^2)$ in a 50 nm thick Pt bar for S and P polarized incident light, respectively.The extracted value of $|θ_K^S/J|$ is significantly smaller, about a 7-fold reduction, than previous results on a nominally identical device. Given that differences in the microstructure of Pt films cannot account for such large discrepancy, this implies that experimental procedures and models should be revised accordingly. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_18443 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | High accuracy Spin Hall Effect Induced Spin Accumulation detection in MOKE Measurements Longo, Emanuele Fontcuberta, Josep Vavassori, Paolo Materials Science Charge to spin (orbital) momentum conversion phenomena enclose great potential for advancing applications in spin/orbitronics. Although current-induced magnetic moment accumulation is crucial both for fundamental understanding and practical applications, direct quantifications are scarce. Optical polarization measurements, namely magneto-optical Kerr rotation (MOKE) ($θ_K$), have been used to get direct evidence of magnetic accumulation perpendicular to a current flow density ($J$) in late transition metals (Pt) as well as in light transition elements (Ti, Cr), and used to conclude evidence of spin or orbital momentum accumulation. However, discrepancies of the reported $θ_K/J$ values, exceeding one order of magnitude, together with early claims that conventional MOKE experiments were not a suitable tool, is prompting revisions of methods and results. Here, we report on a new methodology for MOKE measurements that solves known bottlenecks. We obtain a sensitivity of $(354 \pm 27)$ nV/nrad and use the designed protocol to measure $|θ_K^S/J| = (7.92 \pm 1.94)$ nrad/$(10^7$ A/cm$^2)$ and $|θ_K^P/J| = (6.89 \pm 1.74)$ nrad/$(10^7$ A/cm$^2)$ in a 50 nm thick Pt bar for S and P polarized incident light, respectively.The extracted value of $|θ_K^S/J|$ is significantly smaller, about a 7-fold reduction, than previous results on a nominally identical device. Given that differences in the microstructure of Pt films cannot account for such large discrepancy, this implies that experimental procedures and models should be revised accordingly. |
| title | High accuracy Spin Hall Effect Induced Spin Accumulation detection in MOKE Measurements |
| topic | Materials Science |
| url | https://arxiv.org/abs/2511.18443 |