纳米FeAl合金的磁共振谱分析

在与晶粒组元相当的包裹纳米FeAl晶粒的无序界面或/和表面组元中，存在Fe-Al-Fe电子的超交换作用或/和Fe-Fe交换作用，使多晶FeAl合金因晶粒纳米化出现非磁性—磁性转变.X波段(频率为9.48GHz)的电子自旋共振(ESR)实验表明多晶FeAl合金没有磁共振信号.纳米晶样品的铁磁共振(FMR)信号是一个线宽ΔH_pp为8×10⁴A/m以上的宽峰.还观测到纳米晶体样品中Fe²⁺离子的ESR精细结构双峰，两峰间隔为1.316×10关键词：

MAGNETIC RESONANCE SPUCTRUM ANALYSIS IN NANOSTRUCTURED FeAl ALLOY

When the fraction of inordinate component on the interface or/and surface in nanostructured FeAl is comparable to that of crystal grain which is wrapped up in the former,and there exists Fe-Al-Fe surperexchange or/and Fe-Fe exchange interactions in the inordinate component on the interface or/and surface, a nonmagnetism—magnetism transition between polycrystall FeAl alloy and nanostructured FeAl would result.There was no signal of magnetic resonance in the bulk polycrystal FeAl from the experimental results of electron spin resonance (ESR) in X wave band with a frequancy of 9.48GHz.The ferromagnetic resonance (FMR) signals were observed in the nanostructured samples, whose line widths ΔH_pp were over 8×10⁴A/m.Otherwise,an ESR fine structural signal of double peaks of Fe²⁺ ion was also observed in nanocrystal line samples, the interval of the two peaks was 1.316×10⁵A/m,and the ΔH_pp of each peak was smaller than 800A/m.The configuration of the paramagnetic Fe²⁺ was 3d⁵4s¹, and spin quantum number was S＝1,its zero-field splitting D was 2.448GHz,or 10.12×10^-6eV.An overlap of the ESR double peaks of paramagnetic Fe²⁺ and the wide FMR peak resulted in two sharp peaks like resonant singularities on the FMR spectrum.