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Updated: Jul 12, 2026

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates
Published on: April 12, 2019
Time-Resolved Study of Polaron-Mediated Relaxation in Ferromagnetic La0.67Sr0.33MnO3/BiFeO3 Thin Films by Dual-Color
Le Thi Cam Tuyen1,2, Chi-Yen Huang1, Shin Rou Yin1
1Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan.
None:
La0.67Sr0.33MnO3/BiFeO3 (LSMO/BFO) ferromagnet/antiferromagnet heterostructure thin films were grown on SrTiO3 (100) substrates by pulsed-laser deposition, and their strain-dependent magnetic properties and ultrafast relaxation dynamics were investigated in comparison with single-layer LSMO films. For LSMO/BFO bilayers, increasing the BFO thickness from 40 to 120 nm reduces the coercive field from 8.34 to 3.52 mT and lowers the Curie temperature from 343 to 295 K, consistent with a BFO-thickness-controlled strain state in the LSMO layer that suppresses magnetization. In contrast, single-layer LSMO films exhibit increasing coercive field and Curie temperature with increasing LSMO thickness. Dual-color pump-probe spectroscopy further reveals a marked acceleration of carrier-lattice relaxation in LSMO/BFO: the electron-lattice coupling time decreases from 10.07 to 0.65 ps as BFO thickness increases, accompanied by GHz-range strain-pulse oscillations (18.99-24.48 GHz) and spin-lattice relaxation times approaching ∼100 ps. Single-layer LSMO shows much slower electron-lattice relaxation (>200 ps) and higher-frequency oscillations spanning ∼107.84-229.46 GHz, as determined from both FFT analysis and fitting of the oscillatory component, consistent with small-polaron-dominated transport. Together, these results demonstrate that BFO thickness provides an effective handle to tune strain, magnetic response, and ultrafast carrier-lattice dynamics in LSMO-based heterostructures, with implications for energy-conversion and spintronic applications through improved carrier transport efficiency and tunable magnetic functionalities.
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