Enhanced interfacial ferromagnetism and exchange bias in (111)-oriented LaNiO3/CaMnO3 superlattices

Flint, C. L.; Yi, D.; Karapetrova, E.; N'Diaye, A. T.; Shafer, P.; Arenholz, E.; Suzuki, Y.

doi:10.1103/physrevmaterials.3.064401

Title: Enhanced interfacial ferromagnetism and exchange bias in (111)-oriented ${LaNiO}_{3} / {CaMnO}_{3}$ superlattices

Journal Article · Mon Jun 03 00:00:00 EDT 2019 · Physical Review Materials

DOI:https://doi.org/10.1103/physrevmaterials.3.064401· OSTI ID:1532381

Flint, C. L. ^[1]; Yi, D. ^[1]; Karapetrova, E. ^[2]; N'Diaye, A. T. ^[3]; Shafer, P. ^[3]; Arenholz, E. ^[3]; Suzuki, Y. ^[1]

Stanford Univ., CA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

© 2019 American Physical Society. Emergent properties of complex oxide interfaces are based on interface reconstruction that is driven by mismatch of electronic bands, valence states, interaction lengths, and even crystal symmetry of the interface. In particular, emergent ferromagnetism at the interface of two materials that do not exhibit ferro- or ferrimagnetism in the bulk has been stabilized as a result of competing exchange interactions. When LaNiO3 and CaMnO3, which are a paramagnetic metal and antiferromagnetic insulator in the bulk, respectively, are brought together, ferromagnetism emerges at the interface. Here we show that in (111)-oriented LaNiO3/CaMnO3 (LNO/CMO) superlattices, Ni2+-Mn4+ superexchange interactions due to polar mismatch at the LNO/CMO interfaces are responsible for the emergent ferromagnetism. Compared to (001)-oriented LNO/CMO superlattices, (111)-oriented LNO/CMO superlattices exhibit enhanced interfacial ferromagnetism with a TC>200 K, greater than the bulk antiferromagnetic transition temperature of CaMnO3 and a saturated magnetic moment enhanced by up to a factor of 3. Furthermore, we observe exchange bias in (111)-oriented superlattices. The strong exchange interactions along the (111) interface, manifest in the enhanced Tc and exchange bias, make this class of CMO-based materials with (111)-oriented interfaces good candidates for low-dimensional spin-polarized materials in spintronic applications.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Stanford Univ., CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0008505; AC02-76SF00515; AC02-05CH11231; AC02-06CH11357; ECCS-1542152

OSTI ID:: 1532381

Alternate ID(s):: OSTI ID: 1524116; OSTI ID: 1559868; OSTI ID: 1634046; OSTI ID: 1635665

Journal Information:: Physical Review Materials, Vol. 3, Issue 6; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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Title: Enhanced interfacial ferromagnetism and exchange bias in (111)-oriented ${LaNiO}_{3} / {CaMnO}_{3}$ superlattices