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In a junction system which consists of ferromagnetic- (La1−xSrx)MnO3 and band insulating-SrTiO3, the double exchange ferromagnetism in the (La, Sr)MnO3 layer was controlled by light irradiation through photocarrier injection form SrTiO3. We investigated the dependence of hole doping level (Curie temperature) on the photo control of the (La, Sr)MnO3/SrTiO3 heterojunction. Whereas magnetization and conductivity of the heterojunction with TC of 240 K is strongly reduced, including from metal–insulator transition, by light irradiation, that with TC of 280 K cannot be modulated. This result indicates that phase boundary, between the metallic and insulating region on the (La1−xSrx)MnO3 phase diagram, plays an important role in photo carrier control of the functional heterojunction.
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Katsu et al. (2001) studied this question.
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