A1 Refereed original research article in a scientific journal
Persistent photoinduced magnetization and hole droplets in La0.9Ca0.1MnO3 films
Authors: Huhtinen H, Laiho R, Zakhvalinskii V
Publisher: AMERICAN PHYSICAL SOC
Publication year: 2005
Journal:: Physical Review B
Journal name in source: PHYSICAL REVIEW B
Journal acronym: PHYS REV B
Article number: ARTN 132404
Volume: 71
Issue: 13
Number of pages: 4
ISSN: 1098-0121
DOI: https://doi.org/10.1103/PhysRevB.71.132404
Abstract
Photoinduced magnetization following a stretched exponential growth with time is observed in La0.9Ca0.1MnO3 films exposed to near infrared light in magnetic fields of B >= 0.1 mT. The magnetic irreversibility observed below 56 K between zero-field-cooled and field-cooled films is strongly influenced by illumination, giving space to a persistent magnetic state with increased ferromagnetic interactions, modified magnetic anisotropy and decrease of the blocking temperature to 5 K. When the illumination and the magnetic field are removed the magnetization of the films decays very slowly after a short period of fast relaxation but recovers the original level when the field is applied again. Such behavior obeys predictions for domain pinning in narrow-wall random-field Ising systems. The results suggest trapping of photogenerated electrons by magnetic disorder while the holes contribute to growth of ferromagnetism in the films.
Photoinduced magnetization following a stretched exponential growth with time is observed in La0.9Ca0.1MnO3 films exposed to near infrared light in magnetic fields of B >= 0.1 mT. The magnetic irreversibility observed below 56 K between zero-field-cooled and field-cooled films is strongly influenced by illumination, giving space to a persistent magnetic state with increased ferromagnetic interactions, modified magnetic anisotropy and decrease of the blocking temperature to 5 K. When the illumination and the magnetic field are removed the magnetization of the films decays very slowly after a short period of fast relaxation but recovers the original level when the field is applied again. Such behavior obeys predictions for domain pinning in narrow-wall random-field Ising systems. The results suggest trapping of photogenerated electrons by magnetic disorder while the holes contribute to growth of ferromagnetism in the films.
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