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Magnetism dynamics driven by phase separation in Pr-doped manganite thin films: A ferromagnetic resonance study...

by Elizabeth M Skoropata, Michael R Fitzsimmons
Publication Type
Journal
Journal Name
Physical Review Materials
Publication Date
Page Number
124413
Volume
5
Issue
12

We performed ferromagnetic resonance measurements of a (La1−xPrx)1−yCayMnO3−δ with x=0.52±0.05, y=0.23±0.04, and δ=0.14±0.10 thin single crystalline film which, in combination with micromagnetic simulations, reveal three temperature regions consistent with (i) a ferromagnetic-paramagnetic transition in which ferromagnetic domains nucleate and grow, (ii) followed by a filamentary fluidlike percolation of magnetic domains exhibiting dynamic processes and finally, iii) the existence of a blocking temperature below which the magnetism is a metastable glassy-like state with strong decoherence of the uniform resonance mode. Our results suggest a strain-liquid to strain-glass spin order transition in which the magnetism and fluidlike dynamics of the separated phases freeze at low temperatures. We show the magnetism dynamics depend strongly on the phase-separated state and morphology of the magnetic domains suggesting a route to control of phase separation and realization of spintronic and magnonic devices.