# Threshold Interface Magnetization Required to Induce Magnetic Proximity Effect

## TL;DR

This paper investigates the relationship between proximity-induced magnetization in platinum and the temperature-dependent magnetization of an adjacent ferromagnet, revealing a non-linear scaling and the importance of magnetic susceptibilities in trilayer structures.

## Contribution

It demonstrates that PIM does not linearly scale with FM interface magnetization and highlights the role of heavy metal susceptibilities in asymmetric PIM effects.

## Key findings

- PIM vanishes before FM interface magnetization disappears.
- PIM does not follow expected linear scaling with FM magnetization.
- Heavy metal susceptibilities explain asymmetric PIM in trilayers.

## Abstract

Proximity-induced magnetization (PIM) has broad implications across interface-driven spintronics applications employing spin-currents. We directly determine the scaling between PIM in Pt and the temperature-dependent interface magnetization in an adjacent ferromagnet (FM) using depth-resolved magnetometry. The magnetization due to PIM does not follow the generally expected linear scaling with the FM interface magnetization, as a function of temperature. Instead, it vanishes whilst the FM interface magnetization remains. The effective magnetic susceptibilities of heavy metal (HM) layers are shown to give rise to the previously unexplained asymmetric PIM found in HM/FM/HM trilayers.