Magnetization Dynamics in Strained La0.7Sr0.3MnO3 Thin Film Probed by Time-Resolved Magneto-Optical Kerr Effect Spectroscopy

• Main Authors: Liao, Shu-Wen, 廖淑雯
• Other Authors: Wu, Kaung-Hsiung
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/66681109068345195938

碩士 === 國立交通大學 === 電子物理系所 === 99 === Perovskite manganite La0.7Sr0.3MnO3 show the ferromagnetic metal phase below Tc = 380 K. In this work, the (001)-oriented La0.7Sr0.3MnO3 with various nominal strain state were deposited on SrTiO3(100), LaAlO3(100) and NdGdO3(110) substrates by pulsed laser deposition. The magnetic anisotropy may be change dependent on the type of strain. The photoinduced dynamics of magnetization is probed by Time-Resolved Magneto-Optical Kerr Effect Spectroscopy. Analyses based on the measured Kerr angle-change(ΔθK) curves revealed that while the period of the precession and photoinduced demagnetization time changes with the variation of the thin film strain effect. The possible mechanism for the observed strain effect on the dynamics of magnetization is discussed.