Fe-based amorphous alloy ribbon and method for producing same, iron core, and transformer

An Fe-based amorphous alloy ribbon having a free solidified surface and a roll contact surface,

• wherein the Fe-based amorphous alloy ribbon has a plurality of laser irradiation mark rows each configured from a plurality of laser irradiation marks on at least one surface of the free solidified surface or the roll contact surface;
• and
• wherein the Fe-based amorphous alloy ribbon has:
• a line interval of from 30 mm to 60 mm, the line interval being defined as a centerline interval in a middle section in a width direction, between mutually adjacent laser irradiation mark rows of a plurality of such laser irradiation mark rows arranged in a casting direction of the Fe-based amorphous alloy ribbon, the width direction being orthogonal to the casting direction,
• a spot interval of from 0.10 mm to 0.50 mm, the spot interval being defined as an interval between center points of the plurality of laser irradiation marks in each of the plurality of laser irradiation mark rows, and
• a number density D of the laser irradiation marks of from 0.05 marks/mm2 to 0.50 marks/mm2, provided that the line interval is d1 (mm), the spot interval is d2 (mm), and the number density D of the laser irradiation marks is D=(1/d1)×(1/d2), and
• wherein the Fe-based amorphous alloy ribbon has an iron loss, under conditions of a frequency of 60 Hz and a magnetic flux density of 1.45 T, of 0.160 W/kg or less, and an exciting power, under conditions of a frequency of 60 Hz and a magnetic flux density of 1.45 T, of 0.200 VA/kg or less.