Magnetic proximity effect in $\mathbf{YBa_2Cu_3O_7/La_{2/3}Ca_{1/3}MnO_3}$ and $\mathbf{YBa_2Cu_3O_7/LaMnO_{3+\delta}}$ superlattices

TL;DR

This study investigates the magnetic proximity effect in YBa2Cu3O7 superlattices with different manganite layers, revealing a strong dependence on the electronic state of the manganite and providing detailed magnetic profiles.

Contribution

It demonstrates how the magnetic proximity effect varies with the electronic state of manganite layers in superlattices, using neutron reflectometry and resonant x-ray techniques.

Findings

MPE is pronounced in superlattices with ferromagnetic-metallic LCMO.

MPE is almost absent in superlattices with ferromagnetic-insulating LMO.

The magnetic depth profile changes due to the MPE, indicating its intrinsic nature.

Abstract

Using neutron reflectometry and resonant x-ray techniques we studied the magnetic proximity effect (MPE) in superlattices composed of superconducting YBa$_2$Cu$_3$O$_7$ (YBCO) and ferromagnetic-metallic (FM-M) La$_{0.67}$Ca$_{0.33}$MnO$_{3}$ (LCMO) or ferromagnetic-insulating (FM-I) LaMnO$_{3+\delta}$ (LMO). We find that the MPE strongly depends on the electronic state of the manganite layers, being pronounced for the FM-M LCMO and almost absent for FM-I LMO. We also detail the change of the magnetic depth profile due to the MPE and provide evidence for its intrinsic nature.