Spin dynamics and relaxation in 7.6 nm thin film of La0.7Sr0.3MnO3/SrTiO3: ac magnetic susceptibility and magnetic viscosity investigations

Mottaghi, Navid; Seehra, Mohindar S.; Shi, Jianhang; Jain, Menka; Holcomb, Mikel B.

doi:10.1063/5.0017765

Title: Spin dynamics and relaxation in 7.6 nm thin film of La_0.7Sr_0.3MnO₃/SrTiO₃: ac magnetic susceptibility and magnetic viscosity investigations

Abstract

Analysis of the results from our investigations of the temperature dependence of ac susceptibilities (χ' and χ'') and magnetic viscosity in a 7.6 nm thin film of La_0.7Sr_0.3MnO₃ grown on SrTiO₃ (001) substrate is presented. The Curie temperature (T_C) of this film is magnetic field (H) dependent, varying as [T_C(H) - T_C(0)] ~ Hⁿ with T_C(0) = 270 K and n = 0.15. Temperature dependence of χ' and χ'' measured at ac frequencies f_m in the range of 0.1–10 kHz shows a broad peak near 230 K associated with the blocking temperature (T_B) of spin clusters present in the 1.4 nm surface layer and a frequency dependent peak near 270 K associated with T_C. The mean relaxation time τ determined from the Cole–Cole analysis of the temperature dependent χ' and χ'' is shown to fit the Vogel–Fulcher law: τ = τ₀ exp[ΔE/k_B (T - T₀)] with T₀ = 245 K, ΔE/k_B = 270 K = T_C and τ₀ = 1.2 x 10^-9s. Magnetic viscosity S (measured in H = 0 for a sample cooled in H = 50 Oe) determined from the fit to the magnetization: M (t)= M (0) – S ln t, with time t up to 2more »« less

Authors:

^[1];

^[2];

^[1]

West Virginia Univ., Morgantown, WV (United States)
Univ. of Connecticut, Storrs, CT (United States)

Publication Date:: Tue Aug 18 00:00:00 EDT 2020

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

Sponsoring Org.:: USDOE; National Science Foundation (NSF); National Aeronautics and Space Administration (NASA)

OSTI Identifier:: 1802852

Alternate Identifier(s):: OSTI ID: 1647891

Grant/Contract Number:: SC0016176; DMR-1608656; NNX15AK74A

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Applied Physics

Additional Journal Information:: Journal Volume: 128; Journal Issue: 7; Journal ID: ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; Physics

Citation Formats


                    Mottaghi, Navid, Seehra, Mohindar S., Shi, Jianhang, Jain, Menka, and Holcomb, Mikel B. Spin dynamics and relaxation in 7.6 nm thin film of La0.7Sr0.3MnO3/SrTiO3: ac magnetic susceptibility and magnetic viscosity investigations.  United States: N. p., 2020. 
Web.  doi:10.1063/5.0017765.

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                    Mottaghi, Navid, Seehra, Mohindar S., Shi, Jianhang, Jain, Menka, & Holcomb, Mikel B. Spin dynamics and relaxation in 7.6 nm thin film of La0.7Sr0.3MnO3/SrTiO3: ac magnetic susceptibility and magnetic viscosity investigations.  United States.  https://doi.org/10.1063/5.0017765

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                    Mottaghi, Navid, Seehra, Mohindar S., Shi, Jianhang, Jain, Menka, and Holcomb, Mikel B. Tue .  
"Spin dynamics and relaxation in 7.6 nm thin film of La0.7Sr0.3MnO3/SrTiO3: ac magnetic susceptibility and magnetic viscosity investigations".  United States.  https://doi.org/10.1063/5.0017765.  https://www.osti.gov/servlets/purl/1802852.

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@article{osti_1802852,

  title        = {Spin dynamics and relaxation in 7.6 nm thin film of La0.7Sr0.3MnO3/SrTiO3: ac magnetic susceptibility and magnetic viscosity investigations},

  author       = {Mottaghi, Navid and Seehra, Mohindar S. and Shi, Jianhang and Jain, Menka and Holcomb, Mikel B.},

  abstractNote = {Analysis of the results from our investigations of the temperature dependence of ac susceptibilities (χ' and χ'') and magnetic viscosity in a 7.6 nm thin film of La0.7Sr0.3MnO3 grown on SrTiO3 (001) substrate is presented. The Curie temperature (TC) of this film is magnetic field (H) dependent, varying as [TC(H) - TC(0)] ~ Hn with TC(0) = 270 K and n = 0.15. Temperature dependence of χ' and χ'' measured at ac frequencies fm in the range of 0.1–10 kHz shows a broad peak near 230 K associated with the blocking temperature (TB) of spin clusters present in the 1.4 nm surface layer and a frequency dependent peak near 270 K associated with TC. The mean relaxation time τ determined from the Cole–Cole analysis of the temperature dependent χ' and χ'' is shown to fit the Vogel–Fulcher law: τ = τ0 exp[ΔE/kB (T - T0)] with T0 = 245 K, ΔE/kB = 270 K = TC and τ0 = 1.2 x 10-9s. Magnetic viscosity S (measured in H = 0 for a sample cooled in H = 50 Oe) determined from the fit to the magnetization: M (t)= M (0) – S ln t, with time t up to 2 h, shows a peak at 230 K above which M (2 h) switches to negative values for temperatures up to TC(0). It is argued that this negative magnetization results from an interaction between the superparamagnetic spin clusters and the ferromagnetic phase, both being present in the temperature range of TB < T < TC.},

  doi          = {10.1063/5.0017765},

  journal      = {Journal of Applied Physics},

  number       = 7,

  volume       = 128,

  place        = {United States},

  year         = {Tue Aug 18 00:00:00 EDT 2020},

  month        = {Tue Aug 18 00:00:00 EDT 2020}

}

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Title: Spin dynamics and relaxation in 7.6 nm thin film of La0.7Sr0.3MnO3/SrTiO3: ac magnetic susceptibility and magnetic viscosity investigations

Abstract

Citation Formats

Observation of complete inversion of the hysteresis loop in a bimodal magnetic thin film journal, March 2017

Magnetism and structural distortion in the La 0.7 Sr 0.3 Mn O 3 metallic ferromagnet journal, June 1996

Time-resolved optical studies of spin and quasiparticle dynamics in colossal magnetoresistance materials: La 0.67 Ca 0.33 MnO 3 , La 0.67 Sr 0.33 MnO 3 , and Sr 2 FeMoO 6 journal, July 2008

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Magnetocaloric investigations show magnetic inhomogeneity in a 7.6 nm thin film of La0.7Sr0.3MnO3/SrTiO3 journal, June 2020

Nickel-silica nanocomposite: Variation of the blocking temperature with magnetic field and measuring frequency journal, April 2008

ac susceptibility studies of magnetic relaxation in nanoparticles of Ni dispersed in silica journal, April 2009

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Ising-like chain magnetism, Arrhenius magnetic relaxation, and case against 3D magnetic ordering in β -manganese phthalocyanine (C 32 H 16 MnN 8 ) journal, March 2016

Relationship between blocking temperature and strength of interparticle interaction in magnetic nanoparticle systems journal, June 2016

Mixed-valence manganites journal, March 1999

High temperature spin-glass-like transition in La 0.67 Sr 0.33 MnO 3 nanofibers near the Curie point journal, January 2017

The theory of the Vogel-Fulcher law of spin glasses journal, October 1981

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Title: Spin dynamics and relaxation in 7.6 nm thin film of La_0.7Sr_0.3MnO₃/SrTiO₃: ac magnetic susceptibility and magnetic viscosity investigations

Observation of complete inversion of the hysteresis loop in a bimodal magnetic thin film
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Time-resolved optical studies of spin and quasiparticle dynamics in colossal magnetoresistance materials: ${La}_{0.67} {Ca}_{0.33} {MnO}_{3}$ , ${La}_{0.67} {Sr}_{0.33} {MnO}_{3}$ , and ${Sr}_{2} {FeMoO}_{6}$
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journal, May 2019

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journal, November 2018

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Critical thickness and orbital ordering in ultrathin ${La}_{0.7} {Sr}_{0.3} {MnO}_{3}$ films
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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
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Studies of superspin glass state and AC-losses in La0.7Sr0.3MnO3 nanoparticles obtained by high-energy ball-milling
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Dispersion and Absorption in Dielectrics I. Alternating Current Characteristics
journal, April 1941

Effect of oxygen stoichiometry on the magnetization profiles and negative magnetization in LSMO thin films
journal, September 2019

Multiferroic properties of the PbTiO ₃ /La _2/3 Sr _1/3 MnO ₃ interface studied from first principles
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journal, January 2019

Magnetocaloric effect in La0.67Sr0.33MnO3 manganite above room temperature
journal, August 2011

Pulsed laser deposition of La _{1− x} Sr _x MnO ₃ : thin-film properties and spintronic applications
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Ising-like chain magnetism, Arrhenius magnetic relaxation, and case against 3D magnetic ordering in β -manganese phthalocyanine (C ₃₂ H ₁₆ MnN ₈ )
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Mixed-valence manganites
journal, March 1999

High temperature spin-glass-like transition in La _0.67 Sr _0.33 MnO ₃ nanofibers near the Curie point
journal, January 2017

The theory of the Vogel-Fulcher law of spin glasses
journal, October 1981

Thickness-Dependent Curie Temperatures of Ultrathin Magnetic Films: Effect of the Range of Spin-Spin Interactions
journal, March 2001

From pure superparamagnetism to glass collective state in γ-Fe2O3 nanoparticle assemblies
journal, August 1999

AC Susceptibility Studies of Phase Transitions and Magnetic Relaxation: Conventional, Molecular and Low-Dimensional Magnets
journal, December 2013

Effects of Oxygen Modification on the Structural and Magnetic Properties of Highly Epitaxial La0.7Sr0.3MnO3 (LSMO) thin films
journal, February 2020

Surface and interface properties of $L a_{2 / 3} S r_{1 / 3} Mn O_{3}$ thin films on ${SrTiO}_{3}$ (001)
journal, April 2019

Superparamagnetic behavior of La0.67Sr0.33MnO3 nanoparticles prepared via sol–gel method
journal, October 2009