The invention relates to a magneto-optical recording medium having a magneto-optical layer comprising a quaternary alloy NdxTbyFezCom, where the amounts x,y,z and m of the alloy constituents are selected as follows: x = 4 - 16 at% y = 20 - 30 at% m = 36.5 +/- 4.5 + x - y at% z = 100 - x - y - m at% ed
