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

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

Journal Article · Tue Aug 18 00:00:00 EDT 2020 · Journal of Applied Physics

DOI:https://doi.org/10.1063/5.0017765· OSTI ID:1802852

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

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 2 h, shows a peak at 230 K above which M (2 h) switches to negative values for temperatures up to T_C(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 T_B < T < T_C.

View Accepted Manuscript (DOE)

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

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

Grant/Contract Number:: SC0016176

OSTI ID:: 1802852

Alternate ID(s):: OSTI ID: 1647891

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 7 Vol. 128; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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