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

A wedge bilayer of epitaxial 4–8 nm La 0.7Sr 0.3CoO 3(LSCO)/6-nm La 0.7Sr 0.3MnO 3(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 Co 2+ ions at the interface (s-LSCO), which is biased by the underlying hard LSCO layer (h-LSCO), characterized by predominantly Co 3+/Co 4+ FM ions. For a 5.1-nm layer, the interfacial Co 2+ 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 Co 2+ 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.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [2] ;  [3] ;  [1]
  1. Univ. of California, Davis, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Grant/Contract Number:
SC0014664; AC02-05CH1123; MR-15-328528; AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 3; Journal Issue: 1; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1503452
Alternate Identifier(s):
OSTI ID: 1491944

Kane, Alexander M., Chopdekar, Rajesh V., N’Diaye, Alpha T., Scholl, Andreas, Arenholz, Elke, Mehta, Apurva, and Takamura, Yayoi. Decoupling exchange bias and coercivity enhancement in a perovskite oxide exchange spring bilayer. United States: N. p., Web. doi:10.1103/physrevmaterials.3.014413.
Kane, Alexander M., Chopdekar, Rajesh V., N’Diaye, Alpha T., Scholl, Andreas, Arenholz, Elke, Mehta, Apurva, & Takamura, Yayoi. Decoupling exchange bias and coercivity enhancement in a perovskite oxide exchange spring bilayer. United States. doi:10.1103/physrevmaterials.3.014413.
Kane, Alexander M., Chopdekar, Rajesh V., N’Diaye, Alpha T., Scholl, Andreas, Arenholz, Elke, Mehta, Apurva, and Takamura, Yayoi. 2019. "Decoupling exchange bias and coercivity enhancement in a perovskite oxide exchange spring bilayer". United States. doi:10.1103/physrevmaterials.3.014413.
@article{osti_1503452,
title = {Decoupling exchange bias and coercivity enhancement in a perovskite oxide exchange spring bilayer},
author = {Kane, Alexander M. and Chopdekar, Rajesh V. and N’Diaye, Alpha T. and Scholl, Andreas and Arenholz, Elke and Mehta, Apurva and Takamura, Yayoi},
abstractNote = {A wedge bilayer of epitaxial 4–8 nm La0.7Sr0.3CoO3(LSCO)/6-nm La0.7Sr0.3MnO3(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.},
doi = {10.1103/physrevmaterials.3.014413},
journal = {Physical Review Materials},
number = 1,
volume = 3,
place = {United States},
year = {2019},
month = {1}
}

Works referenced in this record:

Coexistence of Superconductivity and Ferromagnetism in Two Dimensions
journal, July 2011

Glassy ferromagnetism and magnetic phase separation in La 1 ? x Sr x CoO 3
journal, May 2003