Patent ID: 7470308

Claim:
A method of producing magnetic particles, comprising the steps of: preparing alloy particles capable of forming a CuAu or Cu 3 Au hard magnetic ordered alloy phase; and forming magnetic particles, wherein the step of preparing the alloy particles comprises subjecting a plurality of solutions for preparing the alloy particles to a mixing reaction by a liquid phase method using a microreactor, wherein the microreactor is a parallel-flow microreactor in which: the plurality of solutions merge in one microchannel through respective liquid supply channels which form a parallel tube structure, and each merged solution is passed in a parallel laminar flow while diffusing to the direction normal to the contact interface to mix with each other; where by-product gas is generated in the mixing reaction by the liquid phase method using the microreactor, wherein the mixing reaction comprises the steps of: supplying a gas unreactive to the solution to the microchannel to form a gas layer over a solution layer; incorporating the by-product gas into the gas layer, the by-product gas being generated by the mixing reaction and ascending through the solution layer; and discharging the by-product gas outside of the microchannel along with the gas unreactive to the solution.