Ultrafast control of magnetization by photocarrier injection in La 0.9Sr0.1MnO3/SrTiO3 heterostructures

Hiroyuki Yada, Masakazu Matsubara, Hiroyuki Yamada, Akihito Sawa, Hiroyuki Matsuzaki, Hiroshi Okamoto

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10 Citations (Scopus)

Abstract

We investigated photocontrol of magnetization in oxide heterostructures consisting of a perovskite manganite La0.9Sr0.1MnO 3 and a titanate SrTiO3 (STO) by time-resolved magneto-optical Kerr effect measurements. On photoexcitation of STO, the magnetization of the manganite increases within 0.2 ps and persists for ∼500 ps. This ultrafast magnetization is ascribed to rapid hole injection from STO into the manganite due to strong band bending of STO near the interface, while the long lifetime of the magnetization is attributed to a delay in electron injection to the manganite layer. The photocarrier dynamics across the interface is discussed in detail.

Original languageEnglish
Article number165408
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number16
DOIs
Publication statusPublished - 2011 Apr 11

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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