Nanoscale Confinement Enhances Ultrafast Demagnetization
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arXiv
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| Natura: | Preprint |
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2026
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| author | Windsor, Yoav William Lojewski, Tobias Kundu, Moumita Sokolowski-Tinten, Klaus Rothenbach, Nico Eschenlohr, Andrea Gruner, Markus Ernst Ollefs, Katharina Schmitz-Antoniak, Carolin Salamon, Soma Zahn, Daniela Rettig, Laurenz Schüßler-Langeheine, Christian Pontius, Niko Li, Renkai Mo, Mianzhen Park, Suji Shen, Xiaoshe Weathersby, Stephen Wang, Xijie Pentcheva, Rossitza Wende, Heiko Nowak, Ulrich Bovensiepen, Uwe |
| author_facet | Windsor, Yoav William Lojewski, Tobias Kundu, Moumita Sokolowski-Tinten, Klaus Rothenbach, Nico Eschenlohr, Andrea Gruner, Markus Ernst Ollefs, Katharina Schmitz-Antoniak, Carolin Salamon, Soma Zahn, Daniela Rettig, Laurenz Schüßler-Langeheine, Christian Pontius, Niko Li, Renkai Mo, Mianzhen Park, Suji Shen, Xiaoshe Weathersby, Stephen Wang, Xijie Pentcheva, Rossitza Wende, Heiko Nowak, Ulrich Bovensiepen, Uwe |
| contents | Nanoscale miniaturization has revolutionized the field of spintronics by enabling exponential growth in areal bit density. A similar leap is also expected in device speeds through successfully harnessing femtosecond magnetization dynamics. However, combining this with the miniaturization of realistic devices is challenging. To address this, we studied the effect of dimensional confinement on the femtosecond demagnetization of Fe. By gradually increasing the level of confinement while keeping excitation conditions constant, we found that Fe layers thinner than 10 nm exhibit enlarged demagnetization amplitudes, reaching a $\sim75\%$ increase at 2 nm. By combining ultrafast experiments sensitive to the spins, the charge carriers, and the phonons, we establish that this finite$\text{-}$size effect is magnetic in origin and is not phonon$\text{-}$driven. With the support of ab$\text{-}$initio calculations and atomistic spin dynamics simulations, we identify the enhancement effect as due to local weakening of spin order at the Fe$\text{'}$s interface, which becomes significant upon increased confinement. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_28307 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Nanoscale Confinement Enhances Ultrafast Demagnetization Windsor, Yoav William Lojewski, Tobias Kundu, Moumita Sokolowski-Tinten, Klaus Rothenbach, Nico Eschenlohr, Andrea Gruner, Markus Ernst Ollefs, Katharina Schmitz-Antoniak, Carolin Salamon, Soma Zahn, Daniela Rettig, Laurenz Schüßler-Langeheine, Christian Pontius, Niko Li, Renkai Mo, Mianzhen Park, Suji Shen, Xiaoshe Weathersby, Stephen Wang, Xijie Pentcheva, Rossitza Wende, Heiko Nowak, Ulrich Bovensiepen, Uwe Mesoscale and Nanoscale Physics Strongly Correlated Electrons Nanoscale miniaturization has revolutionized the field of spintronics by enabling exponential growth in areal bit density. A similar leap is also expected in device speeds through successfully harnessing femtosecond magnetization dynamics. However, combining this with the miniaturization of realistic devices is challenging. To address this, we studied the effect of dimensional confinement on the femtosecond demagnetization of Fe. By gradually increasing the level of confinement while keeping excitation conditions constant, we found that Fe layers thinner than 10 nm exhibit enlarged demagnetization amplitudes, reaching a $\sim75\%$ increase at 2 nm. By combining ultrafast experiments sensitive to the spins, the charge carriers, and the phonons, we establish that this finite$\text{-}$size effect is magnetic in origin and is not phonon$\text{-}$driven. With the support of ab$\text{-}$initio calculations and atomistic spin dynamics simulations, we identify the enhancement effect as due to local weakening of spin order at the Fe$\text{'}$s interface, which becomes significant upon increased confinement. |
| title | Nanoscale Confinement Enhances Ultrafast Demagnetization |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2605.28307 |