Magnetic-field-dependent ultrafast carrier dynamics and spin–lattice interaction in Au nanopillar/La0.67Sr0.33MnO3 film composites
Abstract
We investigate the carrier and spin dynamics of nanocomposite thin films with Au nanopillars vertically aligned in the La0.67Sr0.33MnO3 matrix using ultrafast optical spectroscopy at 10 K in a magnetic field up to 6 T. The transient reflectivity measurements show two characteristic relaxation processes, which are attributed to the electron–phonon coupling and phonon-assisted spin–lattice interaction, respectively. The electron–phonon coupling constant is independent of the external magnetic field, while the spin–lattice dynamics are strongly influenced by the applied field. We demonstrate that the magnetic-field-induced modification of the spin–lattice interaction originates from a reduction in the magnetic entropy. The field-induced modification of the spin–lattice dynamics is further confirmed by the time-resolved Kerr rotation measurements. Our findings reveal the critical role of the magnetic field in the photo-induced dynamical interactions in nanocomposite films.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (4)
Yaohua Jiang
Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, and Dynamic Materials Data Science Center, Southwest Jiaotong University , Chengdu, Sichuan 610031,
Junyuan Zhang
Daihan Gan
Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, and Dynamic Materials Data Science Center, Southwest Jiaotong University , Chengdu, Sichuan 610031,
Yang Mi