A1 Refereed original research article in a scientific journal
Photoinduced formation of ferromagnetic clusters in La0.9Ca0.1MnO3 thin films
Authors: Huhtinen H, Laiho R, Lahderanta E, Vlasenko LS, Vlasenko MP, Zakhvalinskii VS
Publisher: AMERICAN PHYSICAL SOC
Publication year: 2000
Journal:: Physical Review B (Condensed Matter)
Journal name in source: PHYSICAL REVIEW B
Journal acronym: PHYS REV B
Volume: 62
Issue: 17
First page : 11614
Last page: 11618
Number of pages: 5
ISSN: 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.62.11614
Abstract
Microwave losses due to conductivity and magnetic permeability are investigated in La0.9Ca0.1MnO3 films illuminated with photons in the energy range of E = 0.5-2 eV. Growth of photoinduced ferromagnetic hysteresis is observed when the magnetic field is swept between -15 and 15 mT at temperatures below 60 K. The time required for saturation of the opening of the hysteresis loop depends on the photon energy having the minimum of approximate to 40 s at the illumination intensity I = 3.5 x 10(14) photons/cm(2)s. Both photoinduced magnetization and the increase of microwave photoconductivity can be well explained with a model assuming that small ferromagnetic regions exist within an insulating ferromagnetic phase of the sample and that these regions are expanded by optically induced charge transfer between Jahn-Teller split e(g) states of neighboring Mn3+ ions.
Microwave losses due to conductivity and magnetic permeability are investigated in La0.9Ca0.1MnO3 films illuminated with photons in the energy range of E = 0.5-2 eV. Growth of photoinduced ferromagnetic hysteresis is observed when the magnetic field is swept between -15 and 15 mT at temperatures below 60 K. The time required for saturation of the opening of the hysteresis loop depends on the photon energy having the minimum of approximate to 40 s at the illumination intensity I = 3.5 x 10(14) photons/cm(2)s. Both photoinduced magnetization and the increase of microwave photoconductivity can be well explained with a model assuming that small ferromagnetic regions exist within an insulating ferromagnetic phase of the sample and that these regions are expanded by optically induced charge transfer between Jahn-Teller split e(g) states of neighboring Mn3+ ions.
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