本文报道用单辊液淬方法制备的Fe-M-B(M=Cr,Mo,W)非晶态合金的磁性,讨论了Cr,Mo或W元素的加入对非晶态Fe-B合金的磁矩、Curie温度(Tc),Bloch T~(3/2)定律的系数B或自旋波劲度系数(D)等的影响.从热磁测量的结果得到,三个非晶态合金系列中每个Fe原子的平均磁矩都在2.0μ_B左右,每个Cr,Mo,W原子的平均磁矩分别为-3.96,-4.62,-4.08μ_B(与Fe的磁矩反平行,故为负值).Tc随Cr,Mo或W含量的增加分别以20.5K/at.-%Cr,27.7 K/at-%Mo和26 K/at.-%W的递减率下降.在Tc附近的磁短程序的行为由于外加磁场变得更加明显.系数B随Cr,Mo或W含量的增加而增加,说明磁性原子间相互作用的减弱.
Experimental results for atomic magnetic moment,Curie temperature,T_C,andcoefficient B of the T~(3/2)term in the Bloch law for amorphous alloys Fe-M-B(M=Cr,Mo or W)prepared by the drum spinning technique are reported.Theaverage magnetic moment for each metal atom is 2.0,-3.96,-4.62 or -4.08μ_B for Fe,Cr,Mo or W respectively in the three amorphous alloy systems.Thedecrease of T_C is at the rate of 20.5K/at.-% Cr,27.7K/at.-% Mo,or 26K/at.-%W with increasing Cr,Mo or W content respectively.These results are discussedin the light of a‘mixed’model due to C.W.Chen.The effect of the magneticshort range order around T_C is clearly observed by applying an external magneticfield.The coefficient B increases with the concentration of Cr,Mo or W,whichis interpreted as a consequence of weakening of exchange coupling between themagnetic atoms.
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