MAGNETIC MEMORY ELEMENT AND MAGNETIC MEMORY

摘要

According to one embodiment, a magnetic memory element includes a first magnetic unit, a second magnetic unit, a nonmagnetic unit, and a controller. The second magnetic unit includes a first portion and a second portion. The first portion includes a first region and a second region. The controller performs a first operation and a second operation. In the first operation, the controller changes a direction of a magnetization of the first region by causing a first current to flow through the first portion in a first current direction. The first current has a first current value. In the second operation, the controller changes a direction of a magnetization of the second region by causing a second current to flow through the first portion in a second current direction. The second current has a second current value. The second current value is less than the first current value.

主权项

1. A magnetic memory element, comprising:
a first magnetic unit; a second magnetic unit having a tubular configuration extending in a first direction, the second magnetic unit including a first portion and a second portion, the first portion being provided between the first magnetic unit and the second portion, the first portion including
a first region having a first saturation magnetization, a first magnetic anisotropy, and a first damping constant, anda second region arranged with the first region in a second direction, the second direction being perpendicular to the first direction, the second region having at least one of a second saturation magnetization smaller than the first saturation magnetization, a second magnetic anisotropy smaller than the first magnetic anisotropy, or a second damping constant smaller than the first damping constant; a nonmagnetic unit provided between the first magnetic unit and the second magnetic unit; and a controller electrically connected to the first magnetic unit and the second magnetic unit, the controller performing
a first operation of changing a direction of a magnetization of the first region by causing a first current to flow through the first portion in a first current direction, the first current having a first current value, anda second operation of changing a direction of a magnetization of the second region by causing a second current to flow through the first portion in a second current direction, the second current having a second current value, the second current value being less than the first current value, the first current direction being aligned with the first direction, the second current direction being the reverse of the first current direction.