# Detection of induced paramagnetic moments in Pt on Y$_3$Fe$_5$O$_{12}$ via x-ray magnetic circular dichroism

## TL;DR

This study uses X-ray magnetic circular dichroism to detect induced paramagnetic moments in ultra-thin Pt films on YIG, revealing magnetic behavior beyond simple Pauli paramagnetism and shedding light on the unconventional Hall effect.

## Contribution

It demonstrates the presence of induced paramagnetic moments in Pt on YIG using element-specific XMCD measurements, a novel insight into the magnetic interactions at play.

## Key findings

- XMCD signal increases with magnetic field beyond YIG saturation
- Induced paramagnetic moments in Pt are larger than expected from Pauli paramagnetism
- Results help explain the unconventional Hall effect in Pt/YIG systems

## Abstract

Magnetic moments in an ultra-thin Pt film on a ferrimagnetic insulator Y$_3$Fe$_5$O$_{12}$ (YIG) have been investigated at high magnetic fields and low temperatures by means of X-ray magnetic circular dichroism (XMCD). We observed an XMCD signal due to the magnetic moments in a Pt film at the Pt $L_{3}$- and $L_{2}$-edges. By means of the element-specific magnetometry, we found that the XMCD signal at the Pt $L_{3}$-edge gradually increases with increasing the magnetic field even when the field is much greater than the saturation field of YIG. Importantly, the observed XMCD intensity was found to be much greater than the intensity expected from the Pauli paramagnetism of Pt when the Pt film is attached to YIG. These results imply the emergence of induced paramagnetic moments in Pt on YIG and explain the characteristics of the unconventional Hall effect in Pt/YIG systems.