Method for preparing a ring-formed body, and magnetic memory device and method for manufacturing the same

A magnetic memory device comprising:

• a magnetic memory element which stores data utilizing spin momentum transfer switching and which is formed in a ring-form;
• an electrode connected to a readout element for reading data stored in said magnetic memory element;
• and
• a bit line extending along an upper portion of the electrode, wherein:
• the magnetic memory element has a stacked structure comprising a magnetic layer, a nonmagnetic layer, and a magnetic layer, and is connected to both the electrode and the bit line.

A method of preparing a magnetic memory device comprising the steps of:

• forming a bit line to be connected to a readout element formed on a semiconductor substrate;
• forming a ring-formed magnetic memory element connected to said electrode for storing information utilizing spin momentum transfer switching;
• and
• forming a bit line to be connected to said ring-formed magnetic memory element.