Temperature-dependent proximity magnetism in Pt

TL;DR

This paper demonstrates temperature-dependent magnetic coupling in a Pt spacer between ferromagnets, attributed to proximity-induced magnetism in Pt, challenging traditional coupling mechanisms.

Contribution

It provides experimental evidence of proximity-induced magnetism in Pt and its temperature dependence, a novel insight into magnetic coupling mechanisms.

Findings

Magnetic coupling persists across Pt thicknesses.

Coupling strength varies significantly with temperature.

Proximity-induced magnetism explains the observed phenomena.

Abstract

We experimentally demonstrate the existence of magnetic coupling between two ferromagnets separated by a thin Pt layer. The coupling remains ferromagnetic regardless of the Pt thickness, and exhibits a significant dependence on temperature. Therefore, it cannot be explained by the established mechanisms of magnetic coupling across nonmagnetic spacers. We show that the experimental results are consistent with the presence of magnetism induced in Pt in proximity to ferromagnets, in direct analogy to the well-known proximity effects in superconductivity.