Method of cutting rare-earth alloy

A method of cutting a rare-earth alloy with a wire saw comprising the steps of:

• providing a wire saw by fixing abrasive grains on a core wire with a resin layer, wherein an average distance between two of the abrasive grains, which are adjacent to each other in a length direction, is about 150% to less than about 400% of the average grain size of the abrasive grains, an average height of portions of the abrasive grains, protruding from the surface of the resin layer, is about 70% or less of the average grain size of the abrasive grains, and a thickness deviation percentage of the resin layer with respect to the core wire is about 40%;
• providing a coolant, which is mainly composed of water and has a kinetic friction coefficient of about 0.1 to about 0.3 at approximately 25° C. with respect to the rare-earth alloy;
• and
• moving the wire saw so as to cut the rare-earth alloy while a portion of the rare-earth alloy being cut by the wire saw is immersed in the coolant.