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2025
Tang, N.; Glamsch, S.; Aqeel, A.; Scheuchenpflug, L.; Schulze, M.; Liebald, C.; Rytz, D.; Guguschev, C.; Albrecht, M.; Gegenwart, P. Observation via spin Seebeck effect of macroscopic magnetic transport from emergent magnetic monopoles Unpublished (2025), arXiv:2509.18422. Abstract \| Links \| BibTeX \| Project(s): A2, B5 @unpublished{tang_observation_2025, title = {Observation via spin Seebeck effect of macroscopic magnetic transport from emergent magnetic monopoles}, author = {N. Tang and S. Glamsch and A. Aqeel and L. Scheuchenpflug and M. Schulze and C. Liebald and D. Rytz and C. Guguschev and M. Albrecht and P. Gegenwart}, url = {https://arxiv.org/abs/2509.18422}, doi = {10.48550/arXiv.2509.18422}, year = {2025}, date = {2025-09-22}, urldate = {2025-09-22}, abstract = {Magnetic monopoles, elusive in high-energy physics, have been realised as emergent quasiparticles in solid-state systems, where their unique properties hold promise for novel spintronic applications. Magnetic monopoles have been invoked in diverse platforms, including skyrmion lattices, chiral magnets, soft ferromagnets, aritifical nanomagnets. Yet, a demonstration of their role in magnetic transport has remained elusive. Here, we report such an observation via the spin Seebeck effect in the bulk insulating pyrochlore oxide, spin ice Dy2Ti2O7. By applying a thermal gradient perpendicular to a [111]-oriented magnetic field, we detect a transverse spin Seebeck voltage marked by a dominant peak at the onset of monopole proliferation, accompanied by a secondary feature and frequency-dependent behavior. Our findings establish a direct link between monopole dynamics and magnetic transport in an insulating medium, establishing a new pathway for probing fractionalized excitations and advancing towards novel spintronic applications.}, note = {arXiv:2509.18422}, keywords = {A2, B5}, pubstate = {published}, tppubtype = {unpublished} } Close Magnetic monopoles, elusive in high-energy physics, have been realised as emergent quasiparticles in solid-state systems, where their unique properties hold promise for novel spintronic applications. Magnetic monopoles have been invoked in diverse platforms, including skyrmion lattices, chiral magnets, soft ferromagnets, aritifical nanomagnets. Yet, a demonstration of their role in magnetic transport has remained elusive. Here, we report such an observation via the spin Seebeck effect in the bulk insulating pyrochlore oxide, spin ice Dy2Ti2O7. By applying a thermal gradient perpendicular to a [111]-oriented magnetic field, we detect a transverse spin Seebeck voltage marked by a dominant peak at the onset of monopole proliferation, accompanied by a secondary feature and frequency-dependent behavior. Our findings establish a direct link between monopole dynamics and magnetic transport in an insulating medium, establishing a new pathway for probing fractionalized excitations and advancing towards novel spintronic applications. Close https://arxiv.org/abs/2509.18422 doi:10.48550/arXiv.2509.18422 Close
2024
Chen, L.; Sun, Y.; Mankovsky, S.; Meier, T. N. G.; Kronseder, M.; Sun, C.; Orekhov, A.; Ebert, H.; Weiss, D.; Back, C. H. Signatures of magnetism control by flow of angular momentum Journal Article Nature 633, 548–553 (2024). Abstract \| Links \| BibTeX \| Project(s): A2 @article{chen_signatures_2024, title = {Signatures of magnetism control by flow of angular momentum}, author = {L. Chen and Y. Sun and S. Mankovsky and T. N. G. Meier and M. Kronseder and C. Sun and A. Orekhov and H. Ebert and D. Weiss and C. H. Back}, doi = {10.1038/s41586-024-07914-y}, issn = {1476-4687}, year = {2024}, date = {2024-09-04}, urldate = {2024-09-01}, journal = {Nature}, volume = {633}, number = {8030}, pages = {548–553}, abstract = {Exploring new strategies to manipulate the order parameter of magnetic materials by electrical means is of great importance not only for advancing our understanding of fundamental magnetism but also for unlocking potential applications. A well-established concept uses gate voltages to control magnetic properties by modulating the carrier population in a capacitor structure1–5. Here we show that, in Pt/Al/Fe/GaAs(001) multilayers, the application of an in-plane charge current in Pt leads to a shift in the ferromagnetic resonance field depending on the microwave frequency when the Fe film is sufficiently thin. The experimental observation is interpreted as a current-induced modification of the magnetocrystalline anisotropy ΔHA of Fe. We show that (1) ΔHA decreases with increasing Fe film thickness and is connected to the damping-like torque; and (2) ΔHA depends not only on the polarity of charge current but also on the magnetization direction, that is, ΔHA has an opposite sign when the magnetization direction is reversed. The symmetry of the modification is consistent with a current-induced spin6–8 and/or orbit9–13 accumulation, which, respectively, act on the spin and/or orbit component of the magnetization. In this study, as Pt is regarded as a typical spin current source6,14, the spin current can play a dominant part. The control of magnetism by a spin current results from the modified exchange splitting of the majority and minority spin bands, providing functionality that was previously unknown and could be useful in advanced spintronic devices.}, keywords = {A2}, pubstate = {published}, tppubtype = {article} } Close Exploring new strategies to manipulate the order parameter of magnetic materials by electrical means is of great importance not only for advancing our understanding of fundamental magnetism but also for unlocking potential applications. A well-established concept uses gate voltages to control magnetic properties by modulating the carrier population in a capacitor structure1–5. Here we show that, in Pt/Al/Fe/GaAs(001) multilayers, the application of an in-plane charge current in Pt leads to a shift in the ferromagnetic resonance field depending on the microwave frequency when the Fe film is sufficiently thin. The experimental observation is interpreted as a current-induced modification of the magnetocrystalline anisotropy ΔHA of Fe. We show that (1) ΔHA decreases with increasing Fe film thickness and is connected to the damping-like torque; and (2) ΔHA depends not only on the polarity of charge current but also on the magnetization direction, that is, ΔHA has an opposite sign when the magnetization direction is reversed. The symmetry of the modification is consistent with a current-induced spin6–8 and/or orbit9–13 accumulation, which, respectively, act on the spin and/or orbit component of the magnetization. In this study, as Pt is regarded as a typical spin current source6,14, the spin current can play a dominant part. The control of magnetism by a spin current results from the modified exchange splitting of the majority and minority spin bands, providing functionality that was previously unknown and could be useful in advanced spintronic devices. Close doi:10.1038/s41586-024-07914-y Close