Coherent spin precession via photoinduced antiferromagnetic interactions in La0.67Ca0.33MnO3

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 cohe...

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Published inPhysical review letters Vol. 107; no. 20; p. 207205
Main Authors Zhao, H B, Talbayev, D, Ma, X, Ren, Y H, Venimadhav, A, Li, Qi, Lüpke, G
Format Journal Article
LanguageEnglish
Published United States 11.11.2011
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Summary: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.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.107.207205