Patent ID: 7804710
Filing Date: 2010-09-28
Classification: G11C,H01L

Abstract:
1. A stacked magnetic tunnel junction structure of a multi-layer magnetic random access memory comprising: a plurality of stacked magnetic tunnel junction devices serially connected to each other, and an access transistor shared between the stacked magnetic tunnel junction devices; and a write word line through which a write current flows, the write current generating a hard axis magnetic field used to selectively write a magnetic tunnel junction device of the stacked magnetic tunnel junction devices, wherein when a magnetic tunnel junction device of the stacked magnetic tunnel junction devices is selected to be written and the write current flows through the respective write word line to generate a hard axis magnetic field, a cancel current is generated and flows through the respective write word line of an unselected magnetic tunnel junction device to cancel stray magnetic field of the hard axis magnetic field which impinges on the unselected magnetic tunnel junction device.