Hydrogen sensing device

1. A hydrogen sensing device, comprising:

a multi-layered structure member including a stack, of alternatingly disposed magnetic layers and non-ferromagnetic layers,

wherein one of said magnetic layers is a topmost layer of said multi-layered structure member; and

wherein said topmost layer includes a palladium-based material to detect hydrogen; and

wherein the palladium-based material includes a palladium-based alloy that includes 50% to 95% of palladium and a balance of cobalt.

2. The hydrogen sensing device of claim 1 , wherein each of said magnetic layers includes the palladium-based material.

3. The hydrogen sensing device of claim 1 , wherein said non-ferromagnetic layers include a non-ferromagnetic material selected from the group consisting of copper (Cu), silver (Ag), gold (Au), chromium (Cr), aluminum (Al), tantalum (Ta) and alloys thereof.

4. The hydrogen sensing device of claim 3 , wherein the non-ferromagnetic material includes Cu.

5. The hydrogen sensing device of claim 1 , wherein each of said magnetic layers and said non-ferromagnetic layers has a thickness ranging from 0.5 nm to 5 nm.

6. The hydrogen sensing device of claim 1 , wherein a total number of said magnetic layers and said non-ferromagnetic layers ranges from 3 to 50.

7. The hydrogen sensing device of claim 1 , further comprising a substrate that is connected to a bottom surface of said multi-layered structure member opposite to said topmost layer.

8. The hydrogen sensing device of claim 7 , further comprising a seed layer formed between said substrate and said bottom surface of said multi-layered structure member.

9. The hydrogen sensing device of claim 8 , wherein said seed layer includes iron.