Emergent Ferromagnetism in CaRuO₃/CaMnO₃ (111)-Oriented Superlattices

Journal Article · Sat Feb 17 00:00:00 EST 2024 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.3c04623· OSTI ID:2311076

Kane, Margaret  ^[1]; Bhandari, Churna  ^[2]; Holtz, Megan E. ^[3]; Balakrishnan, Purnima Parvathy  ^[4]; Grutter, Alexander J.  ^[4]; Fitzsimmons, Michael ^[5]; Yang, Chao-Yao ^[6]; Satpathy, Sashi ^[7]; Paudyal, Durga ^[2]; Suzuki, Yuri  ^[1]

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1. Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials
2. Ames Lab., and Iowa State Univ., Ames, IA (United States)
3. Colorado School of Mines, Golden, CO (United States)
4. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
5. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
6. National Yang Ming Chiao Tung University, Hsinchu City (Taiwan)
7. Univ. of Missouri, Columbia, MO (United States)

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. Importantly, 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.

• Research Organization: Ames Laboratory (AMES), Ames, IA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); National Science Foundation (NSF)
• Grant/Contract Number: SC0008505; AC02-07CH11358; EECS1542152; DGE-1656518
• OSTI ID: 2311076
• Report Number(s): IS-J-11,269
• Journal Information: Nano Letters, Vol. 24, Issue 8; ISSN 1530-6984
• Publisher: American Chemical Society
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
emergent magnetism
complex oxides
superlattices
ruthenatess
manganites