Volume 108, Number 1, October 2014
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||08 October 2014|
Ultrafast optical detection of magnetic inhomogeneity in ferromagnetic La0.67Ca0.33MnO3
1 Department of Physics & Astronomy, Hunter College, the City University of New York 695 Park Avenue, New York, NY 10065, USA
2 Department of Optical Science and Engineering, and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University - Shanghai 200433, China
3 Department of Applied Science, The College of William and Mary - Williamsburg, VA 23187, USA
4 Department of Physics, Pennsylvania State University - University Park, PA 16802, USA
Received: 26 June 2014
Accepted: 17 September 2014
Optically excited spin wave resonances in ferromagnetic La0.67Ca0.33MnO3 (LCMO) thin films are probed by subpicosecond Kerr-rotation experiments at 10 K. We identify an extra fundamental mode along with the confined spin wave modes, whose frequency and intensity are independent of film thickness, but depend strongly on the applied magnetic field. We attribute the origin of this mode to magnetic inhomogeneity at the FM ground state. Our results show that the picosecond time-resolved magneto-optical method is a powerful tool for detecting dynamic magnetic inhomogeneity in colossal magneto-resistance manganites.
PACS: 75.78.Jp – Ultrafast magnetization dynamics and switching / 75.30.Et – Exchange and superexchange interactions / 75.47.Lx – Magnetic oxides
© EPLA, 2014
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