Physically unclonable function implemented with spin orbit coupling based magnetic memory

A system comprising:

• a memory;
• a processor coupled to the memory, the processor comprising:
• an array of physically unclonable function (PUF) devices, wherein an individual device of the array comprises a magnetic junction and an interconnect, wherein the interconnect comprises a spin orbit material;
• a circuitry to sense values stored in the array, and to provide a unique output;
• and
• a comparator to compare the unique output with an authentication code;
• and
• a wireless interface to allow the processor to communicate with another device, wherein the magnetic junction comprises:
• a stack of structures including:
• a first structure comprising a magnet with unfixed perpendicular magnetic anisotropy (PMA), wherein the first structure has an anisotropy axis perpendicular to a plane of a device;
• a second structure comprising one of a dielectric or metal;
• and
• a third structure comprising a magnet with fixed PMA, wherein the third structure has an anisotropy axis perpendicular to the plane of the device, and wherein the second structure is between the first and third structures.

An apparatus comprising:

• a first circuitry to initialize, an array of physically unclonable function (PUF) devices, to a logic 0 or logic 1, wherein an individual device of the array comprises a magnetic junction and an interconnect, wherein the interconnect comprises a spin orbit material;
• a second circuitry to apply a current pulse to the interconnect to write one of a logic 1 or logic 0 to the array;
• a third circuitry to disable a write operation for the array in response to applying the current pulse, wherein the magnetic junction comprises:
• a stack of structures including:
• a first structure comprising a magnet with unfixed perpendicular magnetic anisotropy (PMA), wherein the first structure has an anisotropy axis perpendicular to a plane of a device:
• a second structure comprising one of a dielectric or metal;
• and
• a third structure comprising a magnet with fixed PMA, wherein the third structure has an anisotropy axis perpendicular to the plane of the device, and wherein the second structure is between the first and third structures.