# Transfer of magnetic order and anisotropy through epitaxial integration of 3$d$ and 4$f$ spin systems

## TL;DR

This study demonstrates how magnetic order and anisotropy can be transferred through epitaxial interfaces in 3d-4f spin systems, revealing controllable magnetic states in oxide heterostructures.

## Contribution

It provides new insights into the manipulation of spin structures via tailored exchange interactions in epitaxial oxide superlattices.

## Key findings

- Development of a commensurate spiral state in Ni spins below 100 K.
- Induction of Dy magnetic order and Ni spin reorientation below 18 K.
- Reversible magnetic transition induced by an external 3 T magnetic field.

## Abstract

Resonant x-ray scattering at the Dy $M_5$ and Ni $L_3$ absorption edges was used to probe the temperature and magnetic field dependence of magnetic order in epitaxial LaNiO$_3$-DyScO$_3$ superlattices. For superlattices with 2 unit cell thick LaNiO$_3$ layers, a commensurate spiral state develops in the Ni spin system below 100 K. Upon cooling below $T_{ind} = 18$ K, Dy-Ni exchange interactions across the LaNiO$_3$-DyScO$_3$ interfaces induce collinear magnetic order of interfacial Dy moments as well as a reorientation of the Ni spins to a direction dictated by the strong magneto-crystalline anisotropy of Dy. This transition is reversible by an external magnetic field of 3 T. Tailored exchange interactions between rare-earth and transition-metal ions thus open up new perspectives for the manipulation of spin structures in metal-oxide heterostructures and devices.