Utility of reactively sputtered CuNx films in spintronics devices

• We have studied nitrified copper (CuNx) thin films grown by reactive sputtering in the context of spintronic devices. The Ar-to-N-2 flow ratio enables tunability of the electrical resistivity and surface roughness of the CuNx films, with the former increasing to nearly 20 times that of Cu, and the latter reduced to the atomic scale. Incorporating this into a Ta/CuNx/Ta seed stack for spin valves improves the current-in-plane (CIP) magnetoresistance; maximum magnetoresistance results with CuNx seed layer and Cu interlayer. Finally, finite element modeling results are presented that suggest the use of CuNx in nanocontact spin torque oscillators can enhance current densities by limiting the current spread through the device. This may positively impact threshold currents, power requirements, and device reliability.

Subject headings

NATURVETENSKAP  -- Fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

Keyword

Magnetic Multilayers

Tunnel-Junctions

Co/Cu/Co Pillars

Spin-Waves

Magnetoresistance

Oscillators

Excitation

Exchange

Emission

Cu3n

magnetic multilayers

tunnel-junctions

co/cu/co pillars

spin-waves

magnetoresistance

oscillators

excitation

exchange

emission

cu3n

Publication and Content Type

ref (subject category)

art (subject category)