title: Coherent spin precession via photoinduced antiferromagnetic interactions in La0.67Ca0.33MnO3.
abstract: Pronounced spin precessions are observed in a geometry with negligible canting of the magnetization in ferromagnetic La(0.67)Ca(0.33)MnO(3) thin films using the time-resolved magneto-optical Kerr effect. The precession amplitude monotonically decreases with increasing field, indicating that the coherent spin rotation may be triggered by a transient exchange field and not by demagnetization and/or anisotropy field modulation. We attribute the transient exchange field to emergent antiferromagnetic interactions due to charge transfer and modification of the kinetic energy of e(g) electrons under optical excitation.
authors.affiliation: Department of Optical Science and Engineering, Fudan University, Shanghai, China. hbzhao@fudan.edu.cn
authors.forename: H B
authors.initials: HB
authors.lastname: Zhao
authors.forename: D
authors.initials: D
authors.lastname: Talbayev
authors.forename: X
authors.initials: X
authors.lastname: Ma
authors.forename: Y H
authors.initials: YH
authors.lastname: Ren
authors.forename: A
authors.initials: A
authors.lastname: Venimadhav
authors.forename: Qi
authors.initials: Q
authors.lastname: Li
authors.forename: G
authors.initials: G
authors.lastname: Lüpke