Independence of the inverse spin Hall effect with the magnetic phase in thin NiCu films

TL;DR

This study shows that the inverse spin Hall effect in NiCu thin films is comparable to platinum and remains unaffected by magnetic phase changes, indicating independence from ferromagnetic order.

Contribution

It demonstrates that large spin Hall effects in 3d ferromagnets can be independent of their magnetic phase, challenging previous assumptions about their origin.

Findings

Inverse spin Hall effect comparable to platinum in NiCu films

Insensitivity of the effect to magnetic phase transitions

Supports a localized Heisenberg model for the transition

Abstract

Large spin Hall angles have been observed in 3d ferromagnets, but their origin, and especially their link with the ferromagnetic order, remain unclear. Here, we investigate the inverse spin Hall effect of Ni60Cu40 and Ni50Cu50 across their Curie temperature using spin pumping experiments. We evidence that the inverse spin Hall effect in these samples is comparable to that of platinum, and that it is insensitive to the magnetic order. These results points towards a Heisenberg localized model of the transition, and suggest that the large spin Hall effects in 3d ferromagnets can be independent of the magnetic phase.