title: Optical control of the magnetic anisotropy of ferromagnetic bilayered manganites.
abstract: Optical manipulation of the magnetic anisotropy is demonstrated for bilayered manganites, La2-2xSr1+2xMn2O7, by means of femtosecond Kerr-rotation measurements. Upon the photoexcitation on the x=0.32 crystal, the magnetization exhibits the precessional motion for about 1 ns, revealing the directional change of the magnetocrystalline anisotropy from the c axis to the ab plane. This change of the anisotropy induces the nonthermal decrease of the c-axis magnetization component for about 1 ns.
authors.affiliation: Correlated Electron Research Center, National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Tomimoto
authors.forename: M
authors.initials: M
authors.lastname: Matsubara
authors.forename: T
authors.initials: T
authors.lastname: Ogasawara
authors.forename: H
authors.initials: H
authors.lastname: Okamoto
authors.forename: T
authors.initials: T
authors.lastname: Kimura
authors.forename: Y
authors.initials: Y
authors.lastname: Tokura