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

Abstract

© 2019 American Physical Society. 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. 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.

Authors:

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)

Publication Date:: Thu Jan 24 00:00:00 EST 2019

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

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

OSTI Identifier:: 1503452

Alternate Identifier(s):: OSTI ID: 1491944; OSTI ID: 1634041

Grant/Contract Number:: SC0014664; AC02-05CH1123; MR-15-328528; AC02-76SF00515; AC02-05CH11231

Resource 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)

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE

Citation Formats


                    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., 2019. 
Web.  doi:10.1103/physrevmaterials.3.014413.

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                    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.  https://doi.org/10.1103/physrevmaterials.3.014413

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                    Kane, Alexander M., Chopdekar, Rajesh V., N’Diaye, Alpha T., Scholl, Andreas, Arenholz, Elke, Mehta, Apurva, and Takamura, Yayoi. Thu .  
"Decoupling exchange bias and coercivity enhancement in a perovskite oxide exchange spring bilayer".  United States.  https://doi.org/10.1103/physrevmaterials.3.014413.  https://www.osti.gov/servlets/purl/1503452.

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@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 = {© 2019 American Physical Society. 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. 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         = {Thu Jan 24 00:00:00 EST 2019},

  month        = {Thu Jan 24 00:00:00 EST 2019}

}

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

Abstract

Citation Formats

Antiferromagnetic exchange-bias in epitaxial ferromagnetic La0.67Sr0.33MnO3∕SrRuO3 bilayers journal, May 2005

Colossal magnetoresistant materials: the key role of phase separation journal, April 2001

Hidden Magnetic Configuration in Epitaxial La 1 − x Sr x MnO 3 Films journal, December 2010

Unconventional switching behavior in La 0.7 Sr 0.3 MnO 3 /La 0.7 Sr 0.3 CoO 3 exchange-spring bilayers journal, November 2014

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Exchange biasing in La2/3Ca1/3MnO3/La1/3Ca2/3MnO3 multilayers journal, April 1999

Coercivity enhancement in the SrRuO3∕SrMnO3 superlattices journal, June 2006

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Photoemission electron microscope for the study of magnetic materials journal, October 1999

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Nearly total spin polarization in La2/3Sr1/3MnO3 from tunneling experiments journal, January 2003

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Intrinsic luminescence excitation spectrum and extended x-ray absorption fine structure above the K edge in Ca F 2 journal, February 1978

Exchange bias in LaNiO3–LaMnO3 superlattices journal, January 2012

Resonant x-ray reflectivity study of perovskite oxide superlattices journal, November 2011

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A high-mobility electron gas at the LaAlO3/SrTiO3 heterointerface journal, January 2004

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Structural “ δ Doping” to Control Local Magnetization in Isovalent Oxide Heterostructures journal, November 2017

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Unconventional switching behavior in La _0.7 Sr _0.3 MnO ₃ /La _0.7 Sr _0.3 CoO ₃ exchange-spring bilayers
journal, November 2014

Strain-dependent magnetic phase diagram of epitaxial La0.67Sr0.33MnO3 thin films
journal, April 2000

Exchange biasing in La2/3Ca1/3MnO3/La1/3Ca2/3MnO3 multilayers
journal, April 1999

Coercivity enhancement in the SrRuO3∕SrMnO3 superlattices
journal, June 2006

GenX : an extensible X-ray reflectivity refinement program utilizing differential evolution
journal, November 2007

Misfit strain accommodation in epitaxial $A B O_{3}$ perovskites: Lattice rotations and lattice modulations
journal, February 2011

Reversible electric control of exchange bias in a multiferroic field-effect device
journal, July 2010

Strain engineering to control the magnetic and magnetotransport properties of La0.67Sr0.33MnO3 thin films
journal, August 2010

Magnetic correlation between La _0.7 Sr _0.3 MnO ₃ and La _0.7 Sr _0.3 CoO ₃ layers in artificial superlattices
journal, April 2013

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

Interface Physics in Complex Oxide Heterostructures
journal, March 2011

Exchange anisotropy in coupled films of Ni ₈₁ Fe ₁₉ with NiO and Co _x Ni _{1− x} O
journal, June 1992

Thickness dependence of magnetic domain formation in La0.6Sr0.4MnO3 epitaxial thin films studied by XMCD–PEEM
journal, October 2007

Photoemission electron microscope for the study of magnetic materials
journal, October 1999

Strain engineering induced interfacial self-assembly and intrinsic exchange bias in a manganite perovskite film
journal, August 2013

Critical thickness and orbital ordering in ultrathin ${La}_{0.7} {Sr}_{0.3} {MnO}_{3}$ films
journal, September 2008

Positive exchange bias in ferromagnetic La0.67Sr0.33MnO3∕SrRuO3 bilayers
journal, June 2004

Correlation between epitaxial strain and magnetic properties in La _0.7 Sr _0.3 CoO ₃ /La _0.7 Sr _0.3 MnO ₃ bilayers
journal, February 2019

Exchange-bias effect at La $_{0.75}$ Sr $_{0.25}$ MnO $_{3}$ /LaNiO $_{3}$ interfaces
journal, March 2012

Nearly total spin polarization in La2/3Sr1/3MnO3 from tunneling experiments
journal, January 2003

Unidirectional anisotropy in nickel-iron films by exchange coupling with antiferromagnetic films
journal, September 1978

Intrinsic luminescence excitation spectrum and extended x-ray absorption fine structure above the $K$ edge in Ca $F_{2}$
journal, February 1978

Exchange bias in LaNiO3–LaMnO3 superlattices
journal, January 2012

Resonant x-ray reflectivity study of perovskite oxide superlattices
journal, November 2011

Coercivity Enhancement in Exchange Biased Systems Driven by Interfacial Magnetic Frustration
journal, April 2000

An interpretation of the magnetic properties of the perovskite-type mixed crystals La1−xSrxCoO3−λ
journal, August 1958

A high-mobility electron gas at the LaAlO3/SrTiO3 heterointerface
journal, January 2004

Thickness-dependent magnetic and electrical transport properties of epitaxial La _0.7 Sr _0.3 CoO ₃ films
journal, April 2017

Structural “ $δ$ Doping” to Control Local Magnetization in Isovalent Oxide Heterostructures
journal, November 2017

Direct observation of pinned/biased moments in magnetic superlattices
journal, September 2005

Glassy ferromagnetism and magnetic phase separation in ${La}_{1 - x} {Sr}_{x} {CoO}_{3}$
journal, May 2003

Insulator-metal transition and giant magnetoresistance in ${La}_{1 - x}$ ${Sr}_{x}$ ${MnO}_{3}$
journal, May 1995

Exchange bias
journal, February 1999

Interface Ferromagnetism and Orbital Reconstruction in ${BiFeO}_{3} − {La}_{0.7} {Sr}_{0.3} {MnO}_{3}$ Heterostructures
journal, July 2010

Tuning interfacial exchange interactions via electronic reconstruction in transition-metal oxide heterostructures
journal, October 2016

Chemically Driven Nanoscopic Magnetic Phase Separation at the SrTiO3(001)/La1-xSrxCoO3 Interface
journal, April 2011

Colossal magnetoresistance
journal, September 1997

Hard/soft magnetic heterostructures: model exchange-spring magnets
journal, October 1999

Recent advances in pulsed-laser deposition of complex oxides
journal, June 2008

Exchange bias in La _0.7 Sr _0.3 MnO ₃ /NiO and LaMnO ₃ /NiO interfaces
journal, June 2013

Multiple magnetic phases of ${La}_{2} {CoMnO}_{6 - δ}$ $(0 <~ δ <~ 0.05)$
journal, January 2003

Exchange-spring behavior in epitaxial hard/soft magnetic bilayers
journal, November 1998

Interfacial Ferromagnetism and Exchange Bias in ${CaRuO}_{3} / {CaMnO}_{3}$ Superlattices
journal, November 2012

Inverted hysteresis and giant exchange bias in La0.7Sr0.3MnO3/SrRuO3 superlattices
journal, August 2010