Decoupling exchange bias and coercivity enhancement in a perovskite oxide exchange spring bilayer

Kane, Alexander M.; Chopdekar, Rajesh V.; N’Diaye, Alpha T.; Scholl, Andreas; Arenholz, Elke; Mehta, Apurva; Takamura, Yayoi

doi:10.1103/physrevmaterials.3.014413

Title: Decoupling exchange bias and coercivity enhancement in a perovskite oxide exchange spring bilayer

Journal Article · 24 January 2019 · Physical Review Materials

DOI: https://doi.org/10.1103/physrevmaterials.3.014413 · OSTI ID:1503452

Kane, Alexander M. ^[1]; Chopdekar, Rajesh V. ^[2]; N’Diaye, Alpha T. ^[2]; Scholl, Andreas ^[2]; Arenholz, Elke ^[2]; Mehta, Apurva ^[3]; Takamura, Yayoi ^[1]

Univ. of California, Davis, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States)

A wedge bilayer of epitaxial 4–8 nm La_0.7Sr_0.3CoO₃(LSCO)/6-nm La_0.7Sr_0.3MnO₃(LSMO), hard and soft ferromagnets (FM) respectively, was studied using soft x-ray magnetic spectroscopy to elucidate the interplay between the magnetic and electronic properties of the constituent layers. This system exhibits magnetic and electronic segregation within the LSCO layer characterized by soft FM Co²⁺ ions at the interface (s-LSCO), which is biased by the underlying hard LSCO layer (h-LSCO), characterized by predominantly Co³⁺/Co⁴⁺ FM ions. For a 5.1-nm layer, the interfacial Co²⁺ ion concentration is maximized and the h-LSCO coercivity is minimized, while the opposite is true for a 7.8-nm LSCO layer. Furthermore these dual trends in Co²⁺ ion concentration and h-LSCO coercivity within the LSCO serve to independently affect the exchange bias and coercivity of the soft FM layer, resulting in inverse trends between these properties that typically vary simultaneously.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

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

Grant/Contract Number:: AC02-05CH11231; AC02-76SF00515; SC0014664

OSTI ID:: 1503452

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 1 Vol. 3; ISSN PRMHAR; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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