Ferromagnetic bubble clusters in Y$_{0.67}$Ca$_{0.33}$MnO$_3$ thin films

TL;DR

This study investigates the magnetic structure of Y$_{0.67}$Ca$_{0.33}$MnO$_3$ thin films, revealing temperature-dependent ferromagnetic clusters and interface frustration that influence spin-glass behavior.

Contribution

It provides new insights into the magnetic topology and cluster behavior in this manganite thin film system, linking microscopic structure to magnetic properties.

Findings

Identification of ferromagnetic clusters via magnetic force microscopy

Temperature-dependent changes in magnetic topology

Attribution of spin-glass behavior to frustrated interfaces

Abstract

We studied the ferromagnetic topology in a Y$_{0.67}$Ca$_{0.33}$MnO$_3$ thin film with a combination of magnetic force microscopy and magnetization measurements. Our results show that the spin-glass like behavior, reported previously for this system, could be attributed to frustrated interfaces of the ferromagnetic clusters embedded in a non-ferromagnetic matrix. We found temperature dependent changes of the magnetic topology at low temperatures, which suggests a non-static Mn$^{3+}$/Mn$^{4+}$ ratio.