Effect of oxygen stoichiometry on the magnetization profiles and negative magnetization in LSMO thin films

Trappen, Robbyn; Grutter, Alexander J.; Huang, Chih-Yeh; Penn, Aubrey; Mottaghi, Navid; Yousefi, Saeed; Haertter, Allison; Kumari, Shalini; LeBeau, James; Kirby, Brian J.; Holcomb, Mikel B.

doi:10.1063/1.5111858

Title: Effect of oxygen stoichiometry on the magnetization profiles and negative magnetization in LSMO thin films

Abstract

The depth-dependent magnetization in thin film oxygen stoichiometric and oxygen-deficient La_0.7Sr_0.3MnO₃ is investigated by using polarized neutron reflectivity and DC bulk magnetometry. The polarized neutron reflectivity results reveal that the stoichiometric sample shows enhanced interfacial magnetization relative to the rest of the film. The oxygen-deficient sample exhibits a reduced average magnetization from the optimized recipe. Both films show regions of suppressed magnetization at the surface regardless of the growth pressure. The oxygen stoichiometric film does not show an interfacial dead layer, whereas the oxygen-deficient film exhibits a dead layer whose thickness changes with temperature. At a low applied field, we observe striking differences in the depth dependence of the magnetic ordering, with the oxygen-deficient film exhibiting exchange spring behavior, while the stoichiometric film shows a constant magnetization direction across the film. Furthermore, these results suggest that the incorporation of oxygen vacancies during growth leads to an accumulation of vacancies at the interface, which is enhanced at higher temperature due to increased oxygen mobility, creating a region of reduced magnetism that couples to the rest of the film. These results offer insight into the complex behavior and role of oxygen vacancies in the magnetism of these systems. Additionally, the study revealsmore »« less

Authors:

Trappen, Robbyn ^[1];

^[2]; Huang, Chih-Yeh ^[1]; Penn, Aubrey ^[3];

^[1];

^[1]; Kumari, Shalini ^[4]; LeBeau, James ^[3];

^[2]; Holcomb, Mikel B. ^[1]

West Virginia Univ., Morgantown, WV (United States)
National Inst. of Standards and Technology, Gaithersburg, MD (United States)
North Carolina State Univ., Raleigh, NC (United States)
Pennsylvania State Univ., University Park, PA (United States)

Publication Date:: Mon Sep 09 00:00:00 EDT 2019

Research Org.:: West Virginia Univ., Morgantown, WV (United States)

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

OSTI Identifier:: 1594013

Grant/Contract Number:: SC0016176; DMR-1608656

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Applied Physics

Additional Journal Information:: Journal Volume: 126; Journal Issue: 10; Journal ID: ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; interface; segregation

Citation Formats


                    Trappen, Robbyn, Grutter, Alexander J., Huang, Chih-Yeh, Penn, Aubrey, Mottaghi, Navid, Yousefi, Saeed, Haertter, Allison, Kumari, Shalini, LeBeau, James, Kirby, Brian J., and Holcomb, Mikel B. Effect of oxygen stoichiometry on the magnetization profiles and negative magnetization in LSMO thin films.  United States: N. p., 2019. 
Web.  doi:10.1063/1.5111858.

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                    Trappen, Robbyn, Grutter, Alexander J., Huang, Chih-Yeh, Penn, Aubrey, Mottaghi, Navid, Yousefi, Saeed, Haertter, Allison, Kumari, Shalini, LeBeau, James, Kirby, Brian J., & Holcomb, Mikel B. Effect of oxygen stoichiometry on the magnetization profiles and negative magnetization in LSMO thin films.  United States.  https://doi.org/10.1063/1.5111858

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                    Trappen, Robbyn, Grutter, Alexander J., Huang, Chih-Yeh, Penn, Aubrey, Mottaghi, Navid, Yousefi, Saeed, Haertter, Allison, Kumari, Shalini, LeBeau, James, Kirby, Brian J., and Holcomb, Mikel B. Mon .  
"Effect of oxygen stoichiometry on the magnetization profiles and negative magnetization in LSMO thin films".  United States.  https://doi.org/10.1063/1.5111858.  https://www.osti.gov/servlets/purl/1594013.

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@article{osti_1594013,

  title        = {Effect of oxygen stoichiometry on the magnetization profiles and negative magnetization in LSMO thin films},

  author       = {Trappen, Robbyn and Grutter, Alexander J. and Huang, Chih-Yeh and Penn, Aubrey and Mottaghi, Navid and Yousefi, Saeed and Haertter, Allison and Kumari, Shalini and LeBeau, James and Kirby, Brian J. and Holcomb, Mikel B.},

  abstractNote = {The depth-dependent magnetization in thin film oxygen stoichiometric and oxygen-deficient La0.7Sr0.3MnO3 is investigated by using polarized neutron reflectivity and DC bulk magnetometry. The polarized neutron reflectivity results reveal that the stoichiometric sample shows enhanced interfacial magnetization relative to the rest of the film. The oxygen-deficient sample exhibits a reduced average magnetization from the optimized recipe. Both films show regions of suppressed magnetization at the surface regardless of the growth pressure. The oxygen stoichiometric film does not show an interfacial dead layer, whereas the oxygen-deficient film exhibits a dead layer whose thickness changes with temperature. At a low applied field, we observe striking differences in the depth dependence of the magnetic ordering, with the oxygen-deficient film exhibiting exchange spring behavior, while the stoichiometric film shows a constant magnetization direction across the film. Furthermore, these results suggest that the incorporation of oxygen vacancies during growth leads to an accumulation of vacancies at the interface, which is enhanced at higher temperature due to increased oxygen mobility, creating a region of reduced magnetism that couples to the rest of the film. These results offer insight into the complex behavior and role of oxygen vacancies in the magnetism of these systems. Additionally, the study reveals further details of the negative magnetization in La0.7Sr0.3MnO3 reported in previous studies, which are discussed here.},

  doi          = {10.1063/1.5111858},

  journal      = {Journal of Applied Physics},

  number       = 10,

  volume       = 126,

  place        = {United States},

  year         = {Mon Sep 09 00:00:00 EDT 2019},

  month        = {Mon Sep 09 00:00:00 EDT 2019}

}

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Title: Effect of oxygen stoichiometry on the magnetization profiles and negative magnetization in LSMO thin films

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Observation of the Strain Induced Magnetic Phase Segregation in Manganite Thin Films journal, December 2014

Impact of Dzyaloshinskii-Moriya interactions on the thermal stability factor of heavy metal/magnetic metal/oxide based nano-pillars journal, September 2019

Unconventional Transport through Graphene on SrTiO3: A Plausible Effect of SrTiO3 Phase-Transitions journal, August 2014

Interface magnetism of La0.7Sr0.3MnO3 thin films studied by neutron reflectometry journal, March 2000

The Origin of Oxygen Vacancies Controlling La 2/3 Sr 1/3 MnO 3 Electronic and Magnetic Properties journal, January 2016

Growth of GaP 1 − x − y As y N x on Si substrates by chemical beam epitaxy journal, September 2019

Electrostatic potential and valence modulation in La0.7Sr0.3MnO3 thin films journal, September 2018

Effect of Interfacial Octahedral Behavior in Ultrathin Manganite Films journal, April 2014

Surface Recombination in Ultra-Fast Carrier Dynamics of Perovskite Oxide La 0.7 Sr 0.3 MnO 3 Thin Films journal, February 2019

Physical Justification for Negative Remanent Magnetization in Homogeneous Nanoparticles journal, September 2014

Observation and interpretation of negative remanent magnetization and inverted hysteresis loops in a thin film of La 0.7 Sr 0.3 MnO 3 journal, September 2018

Physical interpretation of hysteresis loops: Micromagnetic modeling of fine particle magnetite: PHYSICAL INTERPRETATION OF HYSTERESIS LOOPS journal, October 2002

The effect of the in-plane demagnetizing field on films with weak perpendicular magnetic anisotropy journal, September 2006

Strain-induced phase separation in La 0.7 Sr 0.3 Mn O 3 thin films journal, December 2006

Thermochemical characterization of Zr/Fe 2 O 3 pyrotechnic mixture under natural aging conditions journal, September 2019

Size effects in the formation of an uncompensated ferromagnetic moment in NiO nanoparticles journal, September 2019

Insights into the magnetic dead layer in La 0.7 Sr 0.3 MnO 3 thin films from temperature, magnetic field and thickness dependence of their magnetization journal, May 2018

Oxygen content of La1−xSrxMnO3−y thin films and its relation to electric-magnetic properties journal, April 2006

Achieving excellent metallic magnet-based absorbents by regulating the eddy current effect journal, September 2019

Step-induced uniaxial magnetic anisotropy of La0:67Sr0:33MnO3 thin films journal, December 2005

The exchange-spring magnet: a new material principle for permanent magnets journal, July 1991

Developments in rock magnetism journal, June 1990

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

Correlation between surface rumpling and structural phase transformation in SrTiO 3 journal, March 2012

Magnetic dead layers in sputtered Co40Fe40B20 films journal, April 2008

Cation Size Mismatch and Charge Interactions Drive Dopant Segregation at the Surfaces of Manganite Perovskites journal, May 2013

Optimized fabrication of high-quality La 0.67 Sr 0.33 MnO 3 thin films considering all essential characteristics journal, April 2011

Mid-wavelength infrared photo response and band alignment for sensitized PbSe thin films journal, September 2019

Magnetic properties of epitaxial CoCr films with depth-dependent exchange-coupling profiles journal, April 2017

Optimized fabrication of high quality La0.67Sr0.33MnO3 thin films considering all essential characteristics text, January 2011

Correlation between surface rumpling and structural phase transformation of SrTiO3 text, January 2011

Spatial evolution of the ferromagnetic phase transition in an exchange graded film text, January 2015

Orientation Control of Interfacial Magnetism at La _0.67 Sr _0.33 MnO ₃ /SrTiO ₃ Interfaces
journal, May 2017

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

Interface and Surface Cation Stoichiometry Modified by Oxygen Vacancies in Epitaxial Manganite Films
journal, June 2012

In situ characterization of strontium surface segregation in epitaxial La0.7Sr0.3MnO3 thin films as a function of oxygen partial pressure
journal, October 2008

Polarized neutron reflection as a probe of magnetic films and multilayers
journal, August 1992

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

Magnetoelasticity of Co25Fe75 thin films
journal, September 2019

Spatial Evolution of the Ferromagnetic Phase Transition in an Exchange Graded Film
journal, January 2016

Accelerating Markov Chain Monte Carlo Simulation by Differential Evolution with Self-Adaptive Randomized Subspace Sampling
journal, January 2009

Structural phases driven by oxygen vacancies at the La _0.7 Sr _0.3 MnO ₃ /SrTiO ₃ hetero-interface
journal, January 2015

Reversible control of magnetism in La _0.67 Sr _0.33 MnO ₃ through chemically-induced oxygen migration
journal, February 2016

Symmetry-Driven Atomic Rearrangement at a Brownmillerite-Perovskite Interface
journal, December 2015

Nanoscale magnetic localization in exchange strength modulated ferromagnets
journal, August 2018

Preparation of atomically flat SrTiO ₃ surfaces using a deionized-water leaching and thermal annealing procedure
journal, December 2012

CMR manganites: physics, thin films and devices
journal, April 2003

Reversed remanent magnetic configuration in epitaxial La _{1− x} Sr _x MnO ₃ films
journal, June 2011

Creation and Ordering of Oxygen Vacancies at WO 3−δ and Perovskite Interfaces
journal, April 2018

Melting of Oxygen Vacancy Order at Oxide–Heterostructure Interface
journal, August 2017

Structural and magnetic depth profiles of magneto-ionic heterostructures beyond the interface limit
journal, July 2016

Manipulation by exchange coupling in layered magnetic structures
journal, February 2014

The equation of state of TaC0.99 by X-ray diffraction in radial scattering geometry to 32 GPa and 1073 K
journal, September 2019

Suppression of the metal-insulator transition temperature in thin La0.7Sr0.3MnO3 films
journal, December 2004

Observation of the Strain Induced Magnetic Phase Segregation in Manganite Thin Films
journal, December 2014

Impact of Dzyaloshinskii-Moriya interactions on the thermal stability factor of heavy metal/magnetic metal/oxide based nano-pillars
journal, September 2019

Unconventional Transport through Graphene on SrTiO3: A Plausible Effect of SrTiO3 Phase-Transitions
journal, August 2014

Interface magnetism of La0.7Sr0.3MnO3 thin films studied by neutron reflectometry
journal, March 2000

The Origin of Oxygen Vacancies Controlling La _2/3 Sr _1/3 MnO ₃ Electronic and Magnetic Properties
journal, January 2016

Growth of GaP 1 − x − y As y N x on Si substrates by chemical beam epitaxy
journal, September 2019

Electrostatic potential and valence modulation in La0.7Sr0.3MnO3 thin films
journal, September 2018

Effect of Interfacial Octahedral Behavior in Ultrathin Manganite Films
journal, April 2014

Surface Recombination in Ultra-Fast Carrier Dynamics of Perovskite Oxide La _0.7 Sr _0.3 MnO ₃ Thin Films
journal, February 2019

Physical Justification for Negative Remanent Magnetization in Homogeneous Nanoparticles
journal, September 2014

Observation and interpretation of negative remanent magnetization and inverted hysteresis loops in a thin film of La _0.7 Sr _0.3 MnO ₃
journal, September 2018

Physical interpretation of hysteresis loops: Micromagnetic modeling of fine particle magnetite: PHYSICAL INTERPRETATION OF HYSTERESIS LOOPS
journal, October 2002

The effect of the in-plane demagnetizing field on films with weak perpendicular magnetic anisotropy
journal, September 2006

Strain-induced phase separation in ${La}_{0.7} {Sr}_{0.3} Mn O_{3}$ thin films
journal, December 2006

Thermochemical characterization of Zr/Fe 2 O 3 pyrotechnic mixture under natural aging conditions
journal, September 2019

Size effects in the formation of an uncompensated ferromagnetic moment in NiO nanoparticles
journal, September 2019

Insights into the magnetic dead layer in La 0.7 Sr 0.3 MnO 3 thin films from temperature, magnetic field and thickness dependence of their magnetization
journal, May 2018

Oxygen content of La1−xSrxMnO3−y thin films and its relation to electric-magnetic properties
journal, April 2006

Achieving excellent metallic magnet-based absorbents by regulating the eddy current effect
journal, September 2019

Step-induced uniaxial magnetic anisotropy of La0:67Sr0:33MnO3 thin films
journal, December 2005

The exchange-spring magnet: a new material principle for permanent magnets
journal, July 1991

Developments in rock magnetism
journal, June 1990

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

Correlation between surface rumpling and structural phase transformation in SrTiO $_{3}$
journal, March 2012

Magnetic dead layers in sputtered Co40Fe40B20 films
journal, April 2008

Cation Size Mismatch and Charge Interactions Drive Dopant Segregation at the Surfaces of Manganite Perovskites
journal, May 2013

Optimized fabrication of high-quality La _0.67 Sr _0.33 MnO ₃ thin films considering all essential characteristics
journal, April 2011

Mid-wavelength infrared photo response and band alignment for sensitized PbSe thin films
journal, September 2019

Magnetic properties of epitaxial CoCr films with depth-dependent exchange-coupling profiles
journal, April 2017

Optimized fabrication of high quality La0.67Sr0.33MnO3 thin films considering all essential characteristics
text, January 2011

Correlation between surface rumpling and structural phase transformation of SrTiO3
text, January 2011

Spatial evolution of the ferromagnetic phase transition in an exchange graded film
text, January 2015