On the instability threshold of cobalt substituted Ni–Al ferrite at high-microwave-power levels

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• 作者：Bhattacharyya ; Nidhi Saxena ; Srivastava ; G.P.
• 关键词：75.30.C ; 75.30.G ; 76.50 ; Instability threshold ; Ni&ndash ; Al&ndash ; Co ferrite ; Cobalt substitution ; Spin-wave linewidth
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2003
• 期刊代码：31_03048853
• 类别：ph
• 出版时间：June, 2003
• 卷：262
• 期：2
• 页码：212-217
• 文件大小：257 K

摘要

Parallel-pump spin-wave instability in polycrystalline Ni–Al ferrite has been measured at 9.384GHz. The ground degeneracy of Co²⁺ ions with concentration between 0.01 and 0.025ions/f.u. added stoichiometrically, gives minimum losses and high-instability threshold values. Generalized instability theory for oblique pumping is used to reproduce the experimental butterfly curves. Results show a strong dependence of spin-wave linewidth on wave vector and crystalline anisotropy of cobalt.