Abstract: An Fe-based nanocrystalline soft magnetic alloy including an amorphous phase and crystal grains, wherein clusters are dispersed in the amorphous phase and the alloy has a composition represented by (Fe1-x-ySixAly)100-a-b-cMaM?bCuc (M represents one or more elements selected from the group consisting of Nb, W, Zr, Hf, Ti and Mo; M? represents one or more elements selected from the group consisting of B, C and P; a, b and c represent 2.0?a?5.0, 3.0<b<10.0 and 0<c<3.0, each in atomic %; and x and y represent 0.150?x?0.250 and 0.012?y?0.100 and satisfy 0.190?x+y?0.290).

Abstract: Provided is an Fe-based alloy composition capable of forming an amorphous soft magnetic material which contains no P and which has a glass transition temperature Tg, the Fe-based alloy composition having a composition represented by the formula (Fe1?aTa)100at %?(x+b+c+d)MxBbCcSid, where T is an arbitrary added element such as Ni and M is an arbitrary added element such as Cr, the formula satisfying the following conditions: 0?a?0.3, 11.0 at %?b?18.20 at %, 6.00 at %?c?17 at %, 0 at %?d?10 at %, and 0 at %?x?4 at %.

Abstract: Provided is an Fe-based alloy composition capable of forming an amorphous soft magnetic material which contains no P and which has a glass transition temperature Tg, the Fe-based alloy composition having a composition represented by the formula (Fe1?aTa)100at%?(x+b+c+d)MxBbCcSid, where T is an arbitrary added element such as Ni and M is an arbitrary added element such as Cr, the formula satisfying the following conditions: 0?a?0.3, 11.0 at %?b?18.20 at %, 6.00 at %?c?17 at %, 0 at %?d?10 at %, and 0 at %?x?4 at %.

Abstract: A magneto-impedance element comprises an alloy composed of at least one of Fe, Co and Ni. The alloy has a mixed texture of an amorphous phase and a fine crystalline phase having an average crystal grain size of 50 nm or less. The magneto-impedance element shows a change in impedance in response to an external magnetic field by applying an alternating current. The magneto-impedance element is applied to an azimuth sensor, an autocanceler, or a magnetic head.

Abstract: A method for making a Fe-based soft magnetic alloy where an alloy melt is injected onto a moving cooling unit to form an amorphous alloy ribbon. The alloy melt contains Fe as a main component, B and at least one metallic element M selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Mo and W, the composition of the alloy melt being selected such that the resulting amorphous alloy ribbon is characterized by a first crystallization temperature at which fine grain bcc Fe crystallites precipitate, and a second crystallization temperature at which a compound phase containing Fe--B and/or Fe--M precipitates. The amorphous alloy ribbon is then annealed at a temperature which is higher that the first crystallization temperature and less than the second crystallization temperature for an annealing time in the range of 0 minutes to 20 minutes.