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In the spirit of sharing thrilling stories during the Christmas season, I will present a scientific puzzle that has occupied multiple generations of PhD and Master's students in our labs. This scientific investigation is dedicated to unraveling the mystery of angular momentum transport between two ferromagnetic metal strips on a diamagnetic substrate. The story features a team of dedicated investigators hunting for the ultimate clue to unlock the secret of this puzzle. To this end, the (private) investigators uncover circumstantial evidence to uncover the schemes at play behind this outrageous crime of angular momentum transport in a solid-state environment. Working through the list of usual and exotic suspects, we present our compelling arguments to answer the question: who dunnit?
In more detail and less entertaining fashion, I will highlight our recent progress toward separating electronic and magnonic contributions to angular momentum transport in isolated ferromagnetic metal strips [1]. To this end, we electrically excite and detect spin transport between two parallel and electrically insulated ferromagnetic metal strips on top of a diamagnetic substrate. We observe a finite angular momentum flow to the second ferromagnetic strip across a diamagnetic substrate over micron distances. We discuss phononic and dipolar interactions as the likely cause of angular momentum transfer between the two strips. Next, I will show how different diamagnetic substrates influence the spin transport signal. Finally, I will provide an outlook on our current efforts to separate dipolar and phononic contributions in these transport experiments.
[1] R. Schlitz et al., Phys. Rev. Lett. 132, 256701 (2024).
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