Magnetic memory device

A nonvolatile magnetic memory device comprising:

• a first wiring;
• a magnetoresistive memory element including a tunnel insulating layer interposed between ferromagnetic materials and electrically insulated from said first wiring by a first insulating layer;
• a second insulating layer covering said memory element;
• and
• a second wiring electrically connected to said memory element and buried in said second insulating layer, said second wiring spatially crossing said first wiring with said memory element in between;
• wherein said first wiring and said second wiring are buried in a trench formed in an insulating layer,
• wherein at least a soft magnetic material layer and a diffusion barrier layer are formed in said trench at each outer periphery portion of said first wiring and said second wiring, wherein at least said diffusion barrier layer and said soft magnetic material layer are formed by electroless plating,
• wherein at least said diffusion barrier layer has a uniform thickness,
• wherein the at least soft magnetic layer includes a catalyst, and
• wherein said trench is one quarter of a micron in width or less and is one quarter of a micron in depth or less, the diffusion barrier layer has a diffusion barrier layer thickness of at least several nanometers and the soft magnetic material layer has a soft magnetic material layer thickness of least several tens of nanometers.