Multiply and accumulate calculation device, neuromorphic device, and method for using multiply and accumulate calculation device

A multiply and accumulate calculation device comprising:

• a multiple calculation unit;
• and
• an accumulate calculation unit,
• wherein the multiple calculation unit includes a plurality of multiple calculation elements and at least one reference element,
• each of the plurality of multiple calculation elements and the at least one reference element is a variable resistance element,
• the accumulate calculation unit includes an output detector configured to detect a total value of at least outputs from the plurality of multiple calculation elements,
• each of the plurality of multiple calculation elements is a magnetoresistance effect element including:
• a first magnetization free layer having a magnetic domain wall;
• a first magnetization fixed layer in which a magnetization direction is fixed;
• and
• a first nonmagnetic layer sandwiched between the first magnetization free layer and the first magnetization fixed layer, and
• the at least one reference element is a reference magnetoresistance effect element including:
• a second magnetization free layer that does not have the magnetic domain wall or a third magnetization free layer having the magnetic domain wall;
• a second magnetization fixed layer in which the magnetization direction is fixed;
• and
• a second nonmagnetic layer sandwiched between the second magnetization free layer or the third magnetization free layer and the second magnetization fixed layer,
• wherein a relative angle formed by each of one magnetization direction of the second magnetization free layer or a plurality of magnetization directions of the third magnetization free layer and the magnetization direction of the second magnetization fixed layer is fixed.