Ferromagnetic amorphous alloy

Abstract

A ferromagnetic amorphous alloy having a composition represented by (Co x Ni y Fe z ) a M b G c , wherein M is Cr, Mo and/or W, G is Zr, Hf and/or Ti and x,y,z and a, b, c are selected to meet the conditions of x=1-y-z, 0≦y≦0.2, 0≦z≦0.7, a=1-b-c, 0≦b≦0.05 and 0.05≦c≦0.2 This amorphous alloy has a superior magnetic characteristic and a high thermal stability.

What is claimed is: 
     
       1. A ferromagnetic amorphous alloy having a composition expressed by (Co x  Ni y  Fe z ) a  M b  G c , wherein M is at least one transition metal element selected from the group consisting of Cr, Mo and W, G is .[.at least one element selected from the group consisting of Zr.]. Hf .[.and Ti.]. and wherein x, y, z and a, b, c are selected to meet the conditions of: x=1-y-z, 0≦y≦0.2, 0≦z≦0.7, a=1-c, 0≦b≦0.05 and 0.05≦c≦0.2. 
     
     
       2. A ferromagnetic amorphous alloy as claimed in claim 1, wherein y, z and b meet the condition of y+z+b>0. 
     
     
       3. A ferromagnetic amorphous alloy as claimed in claim 1, wherein y meets the condition of 0<y≦0.2. 
     
     
       4. A ferromagnetic amorphous alloy as claimed in claim 1, wherein z meets the condition of 0<z≦0.7. 
     
     
       5. A ferromagnetic amorphous alloy as claimed in claim 1, wherein b meets the condition of 0<b>0.05. 
     
     
       6. A ferromagnetic amorphous alloy as claimed in claim 1, wherein y and bent the conditions of 0<y≦0.2, 0<z≦0.7 and 0<b<0.05. 
     
     
       7. A ferromagnetic amorphous alloy as claimed in claim 1, wherein Z, b and c meet the conditions of z≈0, b≈0 and c≈0.1. 
     
     
       8. A ferromagnetic amorphous alloy as claimed in claim 7, wherein y meets the condition of y≈0.1. 
     
     
       9. A ferromagnetic amorphous alloy as claimed in claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein the element represented by M is Cr. .[.10. A ferromagnetic amorphous alloy as claimed in claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein the element represented by G is Zr..]. .[.11. A ferromagnetic amorphous alloy as claimed in claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein elements represented by M and G are Cr and Zr, respectively..].