A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Photoinduced formation of ferromagnetic clusters in La0.9Ca0.1MnO3 thin films
Tekijät: Huhtinen H, Laiho R, Lahderanta E, Vlasenko LS, Vlasenko MP, Zakhvalinskii VS
Kustantaja: AMERICAN PHYSICAL SOC
Julkaisuvuosi: 2000
Lehti:: Physical Review B (Condensed Matter)
Tietokannassa oleva lehden nimi: PHYSICAL REVIEW B
Lehden akronyymi: PHYS REV B
Vuosikerta: 62
Numero: 17
Aloitussivu: 11614
Lopetussivu: 11618
Sivujen määrä: 5
ISSN: 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.62.11614
Tiivistelmä
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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