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arXiv 0709.3204cond-mat.str-elcond-mat.mtrl-sci
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La_{0.7} Sr_{0.3} MnO_{3}薄膜的自旋波共振:自旋波刚度和各向异性场的测量

Spin wave resonances in La_{0.7}Sr_{0.3}MnO_{3} films: measurement of spin wave stiffness and anisotropy field

M. Golosovsky, P. Monod, P. K. Muduli, R. C. Budhani

摘要:

利用Bruker公司的X波段ESR谱仪研究了La $_{0.7}$ Sr $_{0.3}$ MnO $_{3}$外延薄膜的磁场相关微波吸收。通过分析铁磁和自旋波共振的角度和温度依赖性,我们确定自旋波刚度和各向异性场。从薄膜中的自旋波驻波共振谱中发现的自旋波刚度与在相同组成的单晶上的非弹性中子散射研究的结果相当一致[Vasiliu-Doloc等人,J. Appl. Phys. \textbf{83},7343(1998)]。

英文摘要:

We studied magnetic field dependent microwave absorption in epitaxial La$_{0.7}$Sr$_{0.3}$MnO$_{3}$ films using an X-band Bruker ESR spectrometer. By analyzing angular and temperature dependence of the ferromagnetic and spin-wave resonances we determine spin-wave stiffness and anisotropy field. The spin-wave stiffness as found from the spectrum of the standing spin-wave resonances in thin films is in fair agreement with the results of inelastic neutron scattering studies on a single crystal of the same composition [Vasiliu-Doloc et al., J. Appl. Phys. \textbf{83}, 7343 (1998)].

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