Magnetic memory with circuit to supply shift pulse to move a domain wall in a magnetic body

A magnetic memory device, comprising:

• a magnetic body including:
• a plurality of first portions that have each a first dimension in a first direction, the first portions being spaced from each other along a second direction intersecting the first direction, and
• a plurality of second portions that have each a second dimension in the first direction that is larger than the first dimension, each second portion being between an adjacent pair of first portions in the second direction;
• and
• a circuit configured to supply a shift pulse to move a domain wall in the magnetic body along the second direction, wherein
• the shift pulse comprises a first pulse and a second pulse,
• the first pulse having a first pulse width,
• the second pulse having a second pulse width that is less than the first pulse width,
• the first pulse is supplied to the magnetic body before the second pulse is supplied to the magnetic body, and
• a first current value of the first pulse is equal to a second current value of the second pulse.

A magnetic memory storage device, comprising:

• a plurality of word lines extending in a first direction;
• a plurality of bit lines extending in a second direction;
• a plurality of magnetic bodies extending in a third direction perpendicular to the first and second directions, each magnetic body extending between a bit line of the plurality of bit lines and a word line of the plurality of word lines and including:
• a first portion that has a first dimension,
• a second portion that has the first dimension and is spaced from the first portion in the third direction, and
• a third portion that has a second dimension and is between the first portion and the second portion in the third direction, the second dimension being greater than the first dimension;
• and
• a circuit configured to supply a shift pulse to the plurality of magnetic bodies via the bit lines and word lines to move a domain wall of a magnetic body of the plurality of magnetic bodies along the third direction, wherein
• the shift pulse comprises a first pulse and a second pulse,
• the first pulse has a first pulse width,
• the second pulse has a second pulse width less than the first pulse width,
• the second pulse is after the first pulse,
• the first pulse has a first polarity, and
• the second pulse has a second polarity different from the first polarity.