Strain- and thickness-dependent magnetic properties of epitaxial La0.67Sr0.33CoO3/La0.67Sr0.33MnO3 bilayers

Feng, Mingzhen; Ahlm, Nolan J.; Kane, Alexander M.; Chiu, I-Ting; Sasaki, Dayne Y.; Shafer, Padraic; N'Diaye, Alpha T.; Mehta, Apurva; Takamura, Yayoi

doi:10.1063/5.0122009

Title: Strain- and thickness-dependent magnetic properties of epitaxial La_0.67Sr_0.33CoO₃/La_0.67Sr_0.33MnO₃ bilayers

Abstract

Magnetic properties and interfacial phenomena of epitaxial perovskite oxides depend sensitively on parameters such as film thickness and strain state. In this work, epitaxial La0_.67Sr_0.33CoO₃(LSCO)/La_0.67Sr_0.33MnO₃ (LSMO) bilayers were grown on NdGaO₃ (NGO) and LaAlO₃ (LAO) substrates with a fixed LSMO thickness of 6 nm, and LSCO thickness (t_LSCO) varying from 2 to 10 nm. Soft x-ray magnetic spectroscopy revealed that magnetically active Co²⁺ions that strongly coupled to the LSMO layer were observed below a critical t_LSCO for bilayers grown on both substrates. On LAO substrates, this critical thickness was 2 nm, above which the formation of Co²⁺ ions was quickly suppressed leaving only a soft LSCO layer with mixed valence Co³⁺/Co⁴⁺ ions. The magnetic properties of both LSCO and LSMO layers displayed strong t_LSCO dependence. This critical t_LSCOincreased to 4 nm on NGO substrates, and the magnetic properties of only the LSCO layer displayed t_LSCO dependence. A non-magnetic layer characterized by Co³⁺ ions and with a thickness below 2 nm exists at the LSCO/substrate interface for both substrates. Therefore, the results contribute to the understanding of interfacial exchange spring behavior needed for applications in next generation spintronic and magnetic memory devices.

Authors:

^[1]; Ahlm, Nolan J. ^[1];

^[1]; Chiu, I-Ting ^[1];

^[1];

^[2];

^[3];

^[1]

University of California, Davis, CA (United States)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
SLAC National Accelerator Laboratory, Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)

Publication Date:: Tue Nov 15 00:00:00 EST 2022

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); National Science Foundation (NSF)

OSTI Identifier:: 1908924

Grant/Contract Number:: AC02-76SF00515; AC02-05CH11231; DMR-1745450

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Applied Physics

Additional Journal Information:: Journal Volume: 132; Journal Issue: 19; Journal ID: ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE

Citation Formats


                    Feng, Mingzhen, Ahlm, Nolan J., Kane, Alexander M., Chiu, I-Ting, Sasaki, Dayne Y., Shafer, Padraic, N'Diaye, Alpha T., Mehta, Apurva, and Takamura, Yayoi. Strain- and thickness-dependent magnetic properties of epitaxial La0.67Sr0.33CoO3/La0.67Sr0.33MnO3 bilayers.  United States: N. p., 2022. 
Web.  doi:10.1063/5.0122009.

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                    Feng, Mingzhen, Ahlm, Nolan J., Kane, Alexander M., Chiu, I-Ting, Sasaki, Dayne Y., Shafer, Padraic, N'Diaye, Alpha T., Mehta, Apurva, & Takamura, Yayoi. Strain- and thickness-dependent magnetic properties of epitaxial La0.67Sr0.33CoO3/La0.67Sr0.33MnO3 bilayers.  United States.  https://doi.org/10.1063/5.0122009

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                    Feng, Mingzhen, Ahlm, Nolan J., Kane, Alexander M., Chiu, I-Ting, Sasaki, Dayne Y., Shafer, Padraic, N'Diaye, Alpha T., Mehta, Apurva, and Takamura, Yayoi. Tue .  
"Strain- and thickness-dependent magnetic properties of epitaxial La0.67Sr0.33CoO3/La0.67Sr0.33MnO3 bilayers".  United States.  https://doi.org/10.1063/5.0122009.  https://www.osti.gov/servlets/purl/1908924.

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@article{osti_1908924,

  title        = {Strain- and thickness-dependent magnetic properties of epitaxial La0.67Sr0.33CoO3/La0.67Sr0.33MnO3 bilayers},

  author       = {Feng, Mingzhen and Ahlm, Nolan J. and Kane, Alexander M. and Chiu, I-Ting and Sasaki, Dayne Y. and Shafer, Padraic and N'Diaye, Alpha T. and Mehta, Apurva and Takamura, Yayoi},

  abstractNote = {Magnetic properties and interfacial phenomena of epitaxial perovskite oxides depend sensitively on parameters such as film thickness and strain state. In this work, epitaxial La0.67Sr0.33CoO3(LSCO)/La0.67Sr0.33MnO3 (LSMO) bilayers were grown on NdGaO3 (NGO) and LaAlO3 (LAO) substrates with a fixed LSMO thickness of 6 nm, and LSCO thickness (tLSCO) varying from 2 to 10 nm. Soft x-ray magnetic spectroscopy revealed that magnetically active Co2+ions that strongly coupled to the LSMO layer were observed below a critical tLSCO for bilayers grown on both substrates. On LAO substrates, this critical thickness was 2 nm, above which the formation of Co2+ ions was quickly suppressed leaving only a soft LSCO layer with mixed valence Co3+/Co4+ ions. The magnetic properties of both LSCO and LSMO layers displayed strong tLSCO dependence. This critical tLSCOincreased to 4 nm on NGO substrates, and the magnetic properties of only the LSCO layer displayed tLSCO dependence. A non-magnetic layer characterized by Co3+ ions and with a thickness below 2 nm exists at the LSCO/substrate interface for both substrates. Therefore, the results contribute to the understanding of interfacial exchange spring behavior needed for applications in next generation spintronic and magnetic memory devices.},

  doi          = {10.1063/5.0122009},

  journal      = {Journal of Applied Physics},

  number       = 19,

  volume       = 132,

  place        = {United States},

  year         = {Tue Nov 15 00:00:00 EST 2022},

  month        = {Tue Nov 15 00:00:00 EST 2022}

}

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Title: Strain- and thickness-dependent magnetic properties of epitaxial La0.67Sr0.33CoO3/La0.67Sr0.33MnO3 bilayers

Abstract

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

Ultrathin oxide films and interfaces for electronics and spintronics journal, February 2011

Quantifying strain dependence in “colossal” magnetoresistance manganites journal, February 1998

Tuning magnetic anisotropy by interfacially engineering the oxygen coordination environment in a transition metal oxide journal, March 2016

Interrelation between Structure - Magnetic Properties in La 0.5 Sr 0.5 CoO 3 journal, July 2014

Octahedral rotations in strained LaAlO 3 /SrTiO 3 (001) heterostructures journal, February 2014

Title: Strain- and thickness-dependent magnetic properties of epitaxial La_0.67Sr_0.33CoO₃/La_0.67Sr_0.33MnO₃ bilayers

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

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

Research Update: Conductivity and beyond at the LaAlO ₃ /SrTiO ₃ interface
journal, June 2016

Lattice mismatch accommodation via oxygen vacancy ordering in epitaxial La _0.5 Sr _0.5 CoO _3-δ thin films
journal, July 2013

Ferroelastic twins in LaAlO3 polycrystals
journal, April 1999

Metal-insulator transitions
journal, October 1998

Spin Blockade, Orbital Occupation, and Charge Ordering in ${La}_{1.5} {Sr}_{0.5} {CoO}_{4}$
journal, March 2009

Thickness-dependent ferromagnetic metal to paramagnetic insulator transition in ${La}_{0.6}$ ${Sr}_{0.4}$ ${MnO}_{3}$ thin films studied by x-ray magnetic circular dichroism
journal, June 2014

Concurrent magnetic and structural reconstructions at the interface of (111)-oriented $L a_{0.7} S r_{0.3} Mn O_{3} / LaFe O_{3}$
journal, November 2016

Interface Physics in Complex Oxide Heterostructures
journal, March 2011

Separation of the strain and finite size effect on the ferromagnetic properties of La0.5Sr0.5CoO3 thin films
journal, October 2007

Engineered superlattices with crossover from decoupled to synthetic ferromagnetic behavior
journal, December 2017

Oxygen Evolution Activity and Stability of Ba ₆ Mn ₅ O ₁₆ , Sr ₄ Mn ₂ CoO ₉ , and Sr ₆ Co ₅ O ₁₅ : The Influence of Transition Metal Coordination
journal, November 2013

X-ray absorption and magnetic circular dichroism of ${LaCoO}_{3}$ , ${La}_{0.7} {Ce}_{0.3} {CoO}_{3}$ , and ${La}_{0.7} {Sr}_{0.3} {CoO}_{3}$ films: Evidence for cobalt-valence-dependent magnetism
journal, November 2010

The crystal structure of NdGaO3 at 100 K and 293 K based on synchrotron data
journal, February 2000

X-ray magnetic circular dichroism—A versatile tool to study magnetism
journal, October 2014

Effect of biaxial strain on the electrical and magnetic properties of (001) La0.7Sr0.3MnO3 thin films
journal, September 2009

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

Intermediate-spin state and properties of ${LaCoO}_{3}$
journal, August 1996

Atomic-resolution in-situ cooling study of oxygen vacancy ordering in La _0.5 Sr _0.5 CoO _3−δ thin films
journal, June 2019

Controlled lateral anisotropy in correlated manganite heterostructures by interface-engineered oxygen octahedral coupling
journal, March 2016

Coercivity enhancement driven by interfacial magnetic phase separation in SrTiO $_{3}$ (001)/Nd $_{0.5}$ Sr $_{0.5}$ CoO $_{3}$
journal, July 2011

Secondary electron emission from surfaces with small structure
journal, September 2015

Tuning the magnetic properties of $La Co O_{3}$ thin films by epitaxial strain
journal, January 2008

Microstructure and magnetic properties of strained La[sub 0.7]Sr[sub 0.3]MnO[sub 3] thin films
journal, January 2000

The classification of tilted octahedra in perovskites
journal, November 1972

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

Thickness-dependent magnetotransport in ultrathin manganite films
journal, May 1999

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

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

Tuning the entanglement between orbital reconstruction and charge transfer at a film surface
journal, February 2014

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

Decoupling exchange bias and coercivity enhancement in a perovskite oxide exchange spring bilayer
journal, January 2019

Perpendicular magnetic anisotropy via strain-engineered oxygen vacancy ordering in epitaxial $L a_{1 - x} S r_{x} Co O_{3 - δ}$
journal, November 2018

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

Controlling Magnetization Vector Depth Profiles of La _0.7 Sr _0.3 CoO ₃ /La _0.7 Sr _0.3 MnO ₃ Exchange Spring Bilayers via Interface Reconstruction
journal, August 2020

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

Ultrathin oxide films and interfaces for electronics and spintronics
journal, February 2011

Quantifying strain dependence in “colossal” magnetoresistance manganites
journal, February 1998

Tuning magnetic anisotropy by interfacially engineering the oxygen coordination environment in a transition metal oxide
journal, March 2016

Interrelation between Structure - Magnetic Properties in La _0.5 Sr _0.5 CoO ₃
journal, July 2014

Octahedral rotations in strained LaAlO ₃ /SrTiO ₃ (001) heterostructures
journal, February 2014