Magnetic memory
A magnetic memory including a plurality of magnetoresistance effect elements that hold information, each including a first ferromagnetic metal layer with a fixed magnetization direction, a second ferromagnetic metal layer with a varying magnetization direction, and a non-magnetic layer sandwiched between the first and second ferromagnetic metal layers; a plurality of first control elements that control reading of the information, wherein each of the plurality of first ferromagnetic metal layers is connected to a first control element, a plurality of spin-orbit torque wiring lines that extend in a second direction intersecting with a first direction which is a stacking direction of the magnetoresistance effect elements, wherein each of the second ferromagnetic metal layers is joined to one spin-orbit torque wiring line; a plurality of second control elements that control electric current flowing through the spin-orbit torque wiring lines.
1 . A magnetic memory comprising:
a plurality of spin-orbit torque magnetoresistance effect elements, each of which includes a ferromagnetic metal layer and a spin-orbit torque wiring disposed in a first direction of the spin-orbit torque wiring, the first direction being a stacking direction of the spin-orbit torque wiring on the ferromagnetic metal layer;
a plurality of pairs of individual control elements, each of which is electrically connected to each of the spin-orbit torque magnetoresistance effect elements; and
a shared control element electrically connected to two or more of the spin-orbit torque magnetoresistance effect elements,
wherein one of each pair of the individual control elements or the shared control element is a read control element that controls reading of information and the read control element is smaller than other control elements.
2 . The magnetic memory according to claim 1 ,
wherein an area for storing an 1-bit information in a planar view in the first direction is 16F 2 or more and 1056F 2 or less, F being a unit of a minimum processing size of length in a circuit configuration is 7 nm, 10 nm, or 28 nm.
3 . The magnetic memory according to claim 1 ,
wherein the area for storing an 1-bit information is an area occupied by the spin-orbit torque magnetoresistance effect elements and the pairs of individual control elements in the planar view in the first direction.
4 . The magnetic memory according to claim 1 ,
wherein in a case where a second direction and a third direction are defined as a direction that the spin-orbit torque wiring extends and a direction that intersects the second direction, respectively, a length of the area for storing an 1-bit information in the third direction is 8F.
5 . The magnetic memory according to claim 1 ,
wherein in a case where a second direction and a third direction are defined as a direction that the spin-orbit torque wiring extends and a direction that intersects the second direction, respectively, individual control elements forming a single pair among the pairs of individual control elements are proximately arranged in the third direction.
6 . The magnetic memory according to claim 1 ,
wherein each of the plurality of pairs of individual control elements is electrically connected to the spin-orbit torque wiring, and
two connection points of a single pair of the individual control elements to the spin orbit torque wiring are separately disposed in positions interposing the ferromagnetic metal layer therebetween as planar viewed in the first direction.
7 . The magnetic memory according to claim 1 ,
wherein one of a single pair of the individual control elements is electrically connected to the spin-orbit torque wiring, and
other of the single pair of the individual control elements is electrically connected to the ferromagnetic metal layer.