Magnetoresistance studies of $La_{2/3} Sr_{1/3} MnO_3$ - $YBa_2 Cu_3 O_7$ - $La_{2/3} Sr_{1/3} Mn O_3$ trilayers with ferromagnetic coupling along the nodal direction of $YBa_2 Cu_3 O_7$

TL;DR

This study investigates (110) trilayers of La_{2/3}Sr_{1/3}MnO_3 and YBa_2Cu_3O_7, revealing enhanced ferromagnetic coupling and unusually high anisotropic magnetoresistance due to pair breaking effects.

Contribution

It demonstrates significantly stronger ferromagnetic coupling in (110) trilayers compared to (001) orientations and reports an exceptionally high anisotropic magnetoresistance.

Findings

Stronger ferromagnetic coupling in (110) trilayers.

First order transition in magnetoresistance data.

High anisotropic magnetoresistance (~72000%)."

Abstract

I have successfully prepared (110) trilayers of \LSMO-\YBCO-\LSMO. Magnetization measurements on these samples reveal a stronger coupling between the ferromagnetic layers. The coupling is an order of magnitude higher than that seen in the case of (001) trilayers. Magnetoresistance measurements show a first order transition in the data coinciding with the antiferromagnetic regime deduced from the magnetization measurements. I have also measured the anisotropic magnetoresistance (AMR) of these samples revealing an unusually high AMR ($\sim 72000%$). I attribute such a high AMR to the pair breaking effects in these films.