Soft-magnetic, amorphous alloy ribbon and its production method, and magnetic core constituted thereby

摘要

A soft-magnetic, amorphous alloy ribbon produced by a rapid quenching method, having transverse lines of recesses formed on its surface by laser beams with predetermined longitudinal intervals, with a doughnut-shaped projection formed around each recess; doughnut-shaped projections having smooth surfaces substantially free from splashes of the alloy melted by the irradiation of laser beams, and a height t₂ of 2 μm or less; and a ratio t₁/T of the depth t₁ of the recesses to the thickness T of the ribbon being in a range of 0.025-0.18, thereby having low iron loss and low apparent power.