物理學報  1999, Vol. 48 Issue (13): 291-297

韓志全

中國西南應用磁學研究所，綿陽 621000

A Model of Microwave Loss Due to Spin Wave Resonance in Grain-Surface-Layers

Han Zhi-Quan

摘要： 考慮了晶粒表層中由雜質和應力引起的感生單軸各向異性場，由進動方程解出了晶粒表層中的自旋波體征頻率.通過比較晶粒內部和表層的自旋波頻譜上、下限，說明了非共振有效線寬ΔHeff來源于晶粒表層的自旋波共振激發.提出的多晶內稟磁化率χi+由晶粒內部的χb+和晶粒表層的χs+所組成，得出了非共振ΔHeff與χs″+及晶粒表層體積分數Vs成正比的關系式.解釋了ΔHeff與晶粒尺寸及氣孔率的關系.闡明了場移的物理機制，理論與實驗相符.

Abstract： The spin wave manifold (spin wave eigenfrequencies) for grain-surface-layers is obtained from the precession equation in consideration of the existence of impurity-induced and stran-induced uniaxial anisotropy field Hs. The top and bottom of the manifold for grain-surface-layers at various applied fields H are illustrated in comparison with the manifold for the grain-interior-region. With the detalled calculation, it is revealed that the off-resonance effective linewidth ΔHeff arises from the spin wave resonance excited in some grain-surface-layers and is propotional to the volume fraction of grain-surface-layers. Thus a lot of previous experiments on ΔHeff vs grain size and porosity can be understood well, and the physical meaning of ΔHeff is clarified. 

引用本文:   

韓志全. 微波鐵氧體損耗的晶粒表層自旋波共振模型. 物理學報, 1999, 48(13): 297. 

Cite this article:   

Han Zhi-Quan. A Model of Microwave Loss Due to Spin Wave Resonance in Grain-Surface-Layers. Acta Phys. Sin., 1999, 48(13): 291-297. 

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