Patent ID: 9577183
Date: 2017-02-21
CPC Classifications: G11C,H01L

Claim:
1. A method of manufacturing a magnetoresistive random access memory (MRAM) device, the method comprising: forming a lower electrode on a substrate; forming a first magnetic layer, a tunnel barrier layer, and a second magnetic layer sequentially on the lower electrode layer; forming an etching mask on the second magnetic layer; and performing an ion beam etching process in which a first ion beam and a second ion beam are simultaneously emitted onto the substrate to form a magnetic tunnel junction (MTJ) structure including a first magnetic layer pattern, a tunnel layer pattern, and a second magnetic layer pattern from the first magnetic layer, the tunnel barrier layer, and the second magnetic layer, respectively, wherein the MTJ structure has no by-products remaining after the ion beam etching process is performed, wherein the first ion beam is emitted from a first ion beam source and has a first incident angle, wherein the second ion beam is emitted from a second ion beam source and has a second incident angle, wherein one of the first ion beam source and the second ion beam source is movable, and the other of the first ion beam source and the second ion beam source is fixed, and wherein the first incident angle and the second incident angle are adjusted by moving the one of the first ion beam source and the second ion beam source so that the MTJ structure has no by-products remaining.