非晶态 Fe-(Co,Cr)-Zr 合金的磁矩分布和电子结构的穆斯堡尔谱研究

The Mssbauer studies of moment distributions and electron structure for amorphous Fe-(Co,Cr)-Zr alloys

分析了室温、７７Ｋ及外加磁场下淬火态和室温下掺氢非晶态Ｆｅ９０－ｘＣｏｘＺｒ１０（ｘ＝４，１０，２０，３０，４０）和Ｆｅ９０－ｙＣｒｙＺｒ１０（ｙ＝０，４，７，１３，１６）的穆期堡尔谱和超精精细场分布Ｐ（Ｈｈｆ）～Ｈｈｆ。实验结果表明：（１）Ｆｅ９０－ｘＣｏｘＺｒ１０（ｘ＝３０，４０）的Ｐ（Ｈｈｆ）是单峰的，表现为强的铁磁性；而Ｆｅ９０－ｘＣｏｘＺｒ１０（ｘ＝４，１０，２０）和Ｆｅ９０－ｙＣｒｙＺｒ１０（ｙ＝０，４，７，１３，１６）的Ｐ（Ｈｈｆ）是双峰或三峰的，采用高斯分布拟合Ｐ（Ｈｈｆ）而得到的低场磁矩的百分比随Ｃｏ（Ｃｒ）含量、温度、外加磁场和掺氢量而变化。在富Ｆｅ区观察到了异常的行为，这些都表明了合金中磁的非均匀性和Ｉｎｖａｒ特性；（２）Ｆｅ－（Ｃｏ，Ｃｒ）－Ｚｒ合金的自旋无序度随Ｃｏ含量减少、Ｃｒ含量增加而增加；（３）Ｆｅ９０－ｘＣｏｘＺｒ１０（ｘ＝４，１０，２０，３０，４０）的磁矩择优取向于合金薄膜的长度方向。用密度不均匀的“３ＤＦＭ＋ＦＳ＋ＦＳＣ”模型满意地解释了实验结果。

The Mssbauer spectra and hyperfine filed distributions P(H hf ) -H hf of as quenched and hydrided amorphous Fe 90-x Co xZr 10 x=4,10,20,30,40) and Fe 90-y Cr yZr 10 (y=0,4,7,13,16) alloys were measured at room temperature,77K and in an applied magnetic filed.The experimental results reveal that (1) the P(H hf ) curves of Fe 90-x Cr xZr 10 (x=30,40) are single and narrow,which means that they are strong ferromagnets,while the P(H hf )curves of Fe 90-x Co xZr 10 (x=4,10,20) and Fe 90-y Cr yZr 10 (y=0,4,7,13,16) comprise two or three Gaussian distributions,and the low-filed spin(moment) fractions vary with Co(Cr) content,temperature ,applied magnetic filed and hydrogenation;and anomalous behavior exists in Co-poor Fe-(Co,Cr)-Zr alloys,indicating the magnetic inhomogeneity and Invar character;(2) the degree of disorder of spins for Fe-(Co,Cr)-Zr alloys increases with decreasing Co content and increasing Cr content;(3) the moment distributions of Fe 90-x Co xZr 10 (x=4,10,20,30,40) are preferential at the direction of the films length.A “3DFM+FS+FSC”model containing density inhomogeneity provides a satisfactory explanation for the present results.