Focused ion beam modification of non-local magnon-based transport in yttrium iron garnet/platinum heterostructures


Focused ion beam modification of non-local magnon-based transport in yttrium iron garnet/platinum heterostructures

Schlitz, R.; Helm, T.; Lammel, M.; Nielsch, K.; Erbe, A.; Goennenwein, S. T. B.

We study the impact of Ga ion exposure on the local and non-local magnetotransport response in heterostructures of the ferrimagnetic insulator yttrium iron garnet and platinum. In particular, we cut the yttrium iron garnet layer in between two electrically separated wires of platinum using a Ga ion beam, and study the ensuing changes in the magnetoresistive response. between the Pt wires is fully cut, although the local spin Hall magnetoresistance signal remains finite. This observation corroborates the notion that pure spin currents carried by magnons are crucial for the non-local magnetotransport effects observed in magnetic insulator/metal nanostructures and that possible substrate contributions to the non-local transport can be ruled out.

Keywords: nano magnetism; spin transport; focussed ion beam

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Publ.-Id: 29267