Title

Coherent Spin Precession via Photoinduced Antiferromagnetic Interactions in La0.67Ca0.33MnO3

Document Type

Article

Department/Program

Applied Science

Journal Title

Physical Review Letters

Pub Date

2011

Volume

107

Issue

20

Abstract

Pronounced spin precessions are observed in a geometry with negligible canting of the magnetization in ferromagnetic La0.67Ca0.33MnO3 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.

DOI

10.1103/PhysRevLett.107.207205

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