Magnetoresistive memory devices

A magnotoresistive memory device, comprising:

• a conductive core comprising a length;
• a plurality of spaced bit regions associated with the conductive core, the bit regions being spaced from one another by spaces along said length;
• the spaces between the bit regions being defined as gap regions;
• the individual bit regions comprising:
• a magnetic ring extending around the conductive core;
• a non-magnetic material over the magnetic ring;
• and
• a magnetic layer over the magnetic ring and separated from the magnetic ring by the non-magnetic material;
• the magnetic ring comprising a magnetic material, and said magnetic material extending between the spaced bit regions;
• and
• physical changes of one or both of the magnetic material and the core in the gap regions relative to the bit regions to prevent propagation of magnetic changes in the bit regions across the gap regions.