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Time dependence of isothermal magnetization in single-phase B1 MoCy encapsulated in multiwall carbon nanocages
Authors:Yositaka Yosida
Institution:Department of Life and Environmental Science, College of Science and Engineering, Iwaki Meisei University, Iwaki Fukushima 970-8551, Japan
Abstract:Isothermal magnetization M(t) in nanocrystalline single-phase B1 MoCy encapsulated in multiwall carbon nanocages is studied within the time window of 100 < t < 5000 s. The current density J exhibits a linear logarithmic time decay. The effective activation energy Ueff increases linearly with increasing temperature T, and decreases linearly with increasing J. The behaviors of J(t), Ueff(T), and Ueff(J) can be described by the Anderson–Kim flux-creep model for thermally activated motion of uncorrelated vortices or vortex bundles over a net potential barrier Ueff. The slower relaxation of current density above the broad peak field in the isothermal magnetization curves suggests that the peak is a result of vortex dynamics.
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