Tuning the interlayer coupling in La 0.7 Sr 0.3 Mn 0.95 Ru 0.05 O3 / LaNiO3 multilayers with perpendicular magnetic anisotropy

Schöpf, Jörg; Piva, Valentina; van Loosdrecht, Paul M.; Lindfors-Vrejoiu, Ionela; Shafer, Padraic; Kumah, Divine P.; Zhang, Xuanyi; Yao, Lide; van Dijken, Sebastiaan

doi:10.1103/physrevmaterials.8.094410

Tuning the interlayer coupling in La 0.7 Sr 0.3 Mn 0.95 Ru 0.05 O3 / LaNiO3 multilayers with perpendicular magnetic anisotropy

Journal Article · Tue Sep 24 00:00:00 EDT 2024 · Physical Review Materials

DOI:https://doi.org/10.1103/physrevmaterials.8.094410· OSTI ID:2504277

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Univ. of Cologne (Germany)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Duke Univ., Durham, NC (United States); North Carolina State University, Raleigh, NC (United States)
Aalto Univ., Otaniemi (Finland)
Aalto Univ., Otaniemi (Finland). School of Science

In ferromagnetic oxide epitaxial multilayers, magnetic properties and interlayer coupling are determined by a variety of factors. Beyond the contribution of interlayer exchange coupling, strain and interfacial effects, such as structural reconstructions or charge transfer, play significant roles, resulting in complex magnetic behavior. In this study, the interlayer coupling of ferromagnetic La_0.7⁢Sr_0.3⁢Mn_0.95⁢Ru_0.05⁢O₃ (LSMRO) layers (8 nm thick) was investigated, when separated by epitaxial spacers of paramagnetic metallic LaNiO₃ (LNO), in stacks exhibiting perpendicular magnetic anisotropy. By varying the thickness of the spacer, it was found that the coupling between two LSMRO layers changes from antiferromagnetic (with a 4-unit-cell-thick LNO spacer) to ferromagnetic (with a 6-unit-cell-thick LNO spacer). For multilayers comprising five LSMRO layers and a 4-unit-cell-thick LNO spacer, the antiferromagnetic coupling was preserved. However, the effective magnetic anisotropy changed, causing the magnetization to cant more towards the in-plane direction. Further, this behavior was corroborated by X-ray magnetic circular dichroism (XMCD) investigations at the Mn and Ni L₃ edges. The XMCD results indicated that the 4-unit-cell-thick LNO spacer in the multilayer become magnetically ordered, closely following the magnetization of adjacent LSMRO layers.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); German Research Foundation (DFG); National Science Foundation (NSF)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2504277

Alternate ID(s):: OSTI ID: 2473508

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 9 Vol. 8; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Tuning the interlayer coupling in La 0.7 Sr 0.3 Mn 0.95 Ru 0.05 O3 / LaNiO3 multilayers with perpendicular magnetic anisotropy

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