Emergent Ferromagnetism in CaRuo3/CaMnO3 (111)-Oriented Superlattices

Published

February 17, 2024

Author(s)

Margaret Kane, Churna Bhandari, Megan Holtz, Purnima Balakrishnan, Alexander Grutter, Michael R. Fitzsimmons, Chao-Yao Yang, Sashi Satpathy, Durga Paudyal, Yuri Suzuki

Abstract

The boundary between CaRuO3 and CaMnO3 is an ideal test bed for emergent magnetic ground states stabilized through interfacial electron interactions. In this system, nominally antiferromagnetic and paramagnetic materials combine to yield interfacial ferromagnetism in CaMnO3 due to electron leakage across the interface. In this work, we show that the crystal symmetry at the surface is a critical factor determining the nature of the interfacial interactions. Specifically, by growing CaRuO3/CaMnO3 heterostructures along the (111) instead of the (001) crystallographic axis, we achieve a 3-fold enhancement of the magnetization and involve the CaRuO3 layers in the ferromagnetism, which now spans both constituent materials. The stabilization of a net magnetic moment in CaRuO3 through strain effects has been long-sought but never consistently achieved, and our observations demonstrate the importance of interface engineering in the development of new functional heterostructures.

Citation

Nano Letters

Volume

24

Issue

8

Pub Type

Journals

Download Paper

https://doi.org/10.1021/acs.nanolett.3c04623

Local Download

Keywords

Magnetism, Thin Film, Superlattice, Neutron Reflectometry

Citation

Kane, M. , Bhandari, C. , Holtz, M. , Balakrishnan, P. , Grutter, A. , Fitzsimmons, M. , Yang, C. , Satpathy, S. , Paudyal, D. and Suzuki, Y. (2024), Emergent Ferromagnetism in CaRuo3/CaMnO3 (111)-Oriented Superlattices, Nano Letters, [online], https://doi.org/10.1021/acs.nanolett.3c04623, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=957167 (Accessed October 2, 2025)