Metallic spin super lattice for logic and memory devices
Described is an apparatus which comprises: an input ferromagnet to receive a first charge current and to produce a corresponding spin current; and a stack of metal layers configured to convert the corresponding spin current to a second charge current, wherein the stack of metal layers is coupled to the input magnet.
1. An apparatus comprising:
a magnet to receive a first charge current and to produce a corresponding spin current; and
a stack of structures, wherein the stack is to convert the corresponding spin current to a second charge current, wherein one structure of the stack of structures is adjacent to the magnet, and wherein the stack comprises a spin metallic super-lattice which includes a lattice of an alloy and a non-alloy metal.
2. The apparatus of claim 1 , wherein the alloy has a surface corrugation.
3. The apparatus of claim 1 , wherein the alloy comprises a heavy metal.
4. The apparatus of claim 1 , wherein the non-alloy metal of the stack is coupled to the magnet.
5. The apparatus of claim 4 , wherein the non-alloy metal includes one of:
Ag,
Cu, or
Au.
6. The apparatus of claim 1 , wherein the alloy includes one of:
Bi and Ag;
Bi and Cu; or
Pb and Ag.
7. The apparatus of claim 1 , wherein the corresponding spin current is converted to the second charge current as the corresponding spin current flows through the alloy and the non-alloy metal.
8. The apparatus of claim 1 , wherein the alloy has a high density two dimensional (2D) electron gas with high Rashba spin orbit coupling, and wherein the 2D electron gas becomes a 2D spin gas when the second charge current flows though the 2D electron gas.
9. The apparatus of claim 1 , wherein the spin metallic super-lattice is matched to the magnet.
10. The apparatus of claim 1 , wherein the non-alloy metal of the spin metallic super-lattice is matched to the magnet, and wherein the non-alloy metal is followed by an interface of the alloy.
11. The apparatus of claim 1 , wherein the magnet comprises a Heusler alloy.
12. The apparatus of claim 1 , wherein a sign or direction of the second charge current is according to a direction of magnetization of the magnet.
13. A system comprising:
a memory;
a processor coupled to the memory, the processor having an apparatus which includes:
an input ferromagnet to receive a first charge current and to produce a corresponding spin current; and
a stack of metal layers configured to convert the corresponding spin current to a second charge current, wherein the stack of metal layers is coupled to the input ferromagnet, wherein the stack of metal layers forms a spin metallic super-lattice with a surface alloy, and wherein the spin metallic super-lattice includes a lattice of the surface alloy and a non-alloy metal; and
a wireless interface to allow the processor to communicate with another device.
14. The apparatus of claim 1 , wherein the stack is operable for write operation by a forward Rashba effect, and wherein the stack is operable for read operation by an inverse Rashba-Edelstein effect.
15. The apparatus of claim 1 comprises an interconnect including metal, wherein the interconnect is adjacent to a sidewall of the stack to provide the output charge current to another device.
16. An apparatus comprising:
a magnet; and
a stack of structures adjacent to the magnet, wherein the stack comprises a spin metallic super-lattice which includes a lattice of an alloy and a non-alloy metal, wherein:
the non-alloy metal includes one of: Ag, Cu, or Au; and
the alloy includes one of: Bi and Ag; Bi and Cu; or Pb and Ag.
17. The apparatus of claim 16 , comprises an interconnect including metal, wherein the interconnect is adjacent to a sidewall of the stack to provide the output charge current to another device.
18. The apparatus of claim 16 , wherein the alloy has a surface corrugation.
19. The apparatus of claim 16 , wherein the alloy comprises a heavy metal.