Shift register memory device, shift register, and data storage method

摘要

According to one embodiment, a shift register memory device includes a shift register, a program/read element, and a rotating force application unit. The shift register includes a plurality of rotors arranged along one direction and provided with a uniaxial anisotropy. Each of the plurality of rotors has a characteristic direction rotatable around a rotational axis extending in the one direction. The program/read element is configured to program data to the shift register by causing the characteristic direction of one of the rotors to match one selected from two directions conforming to the uniaxial anisotropy and configured to read the data by detecting the characteristic direction. The rotating force application unit is configured to apply a rotating force to the shift register to urge the characteristic direction to rotate. The plurality of rotors are organized into a plurality of pairs of every two mutually adjacent rotors. A first force acts to urge the characteristic directions to be opposingly parallel for two of the rotors belonging to the same pair. A second force acts to urge the characteristic directions to be opposingly parallel for two mutually adjacent rotors belonging to mutually adjacent pairs.

主权项

1. A shift register device, comprising:
a shift register having a first lamination along a first direction in order of a first ferromagnetic layer, a first buffer layer, a second ferromagnetic layer, a second buffer layer, a third ferromagnetic layer, a third buffer layer, a fourth ferromagnetic layer, and a fourth buffer layer; and a magnetic field application unit configured to apply a magnetic field to the shift register, a direction of the magnetic field rotating in a plane, the plane intersecting with the first direction, wherein the first buffer layer is thinner than the second buffer layer, and the third buffer layer is thinner than the fourth buffer layer.