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Converting angular momentum between different degrees of freedom within amagnetic material results from a dynamic interplay between electrons, magnonsand phonons. This interplay is pivotal to implementing spintronic deviceconcepts that rely on spin angular momentum transport. We establish a newconcept for long-range angular momentum transport that further allows toaddress and isolate the magnonic contribution to angular momentum transport ina nanostructured metallic ferromagnet. To this end, we electrically excite anddetect spin transport between two parallel and electrically insulatedferromagnetic metal strips on top of a diamagnetic substrate. Charge-to-spincurrent conversion within the ferromagnetic strip generates electronic spinangular momentum that is transferred to magnons via electron-magnon coupling.We observe a finite angular momentum flow to the second ferromagnetic stripacross a diamagnetic substrate over micron distances, which is electricallydetected in the second strip by the inverse charge-to-spin current conversionprocess. We discuss phononic and dipolar interactions as the likely cause totransfer angular momentum between the two strips. Moreover, our work providesthe experimental basis to separate the electronic and magnonic spin transportand thereby paves the way towards magnonic device concepts that do not rely onmagnetic insulators.

Electrically induced angular momentum flow between separated ferromagnets