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 in | Physical review letters Vol. 107; no. 20; p. 207205 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
11.11.2011
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Online Access | Get more information |
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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. |
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ISSN: | 1079-7114 |
DOI: | 10.1103/PhysRevLett.107.207205 |