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Graphene-passivated nickel as an oxidation-resistant electrode for spintronics
Bruno Dlubak1, Marie-Blandine Martin, Robert S Weatherup
1Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, United Kingdom. bruno.dlubak@eng.cam.ac.uk
ACS Nano
|November 14, 2012
Summary
Graphene-passivated ferromagnetic electrodes (GPFE) offer oxidation resistance for spintronic devices. This novel spin source enables cost-effective fabrication using wet chemistry processes.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Oxidation of ferromagnetic electrodes is a significant challenge in spintronics.
- Development of robust, spin-polarized electrodes is crucial for advanced spin devices.
Purpose of the Study:
- To introduce graphene-passivated ferromagnetic electrodes (GPFE) as a solution for oxidation resistance.
- To demonstrate the efficacy of GPFE in maintaining spin polarization and enabling new functionalities.
Main Methods:
- Direct coating of nickel with few-layer graphene via chemical vapor deposition (CVD).
- Fabrication and characterization of reference tunneling spin valve structures using GPFE.
Main Results:
- GPFE exhibit excellent oxidation resistance, preserving the unoxidized nickel surface.
- The GPFE function as effective spin polarizers.
- Graphene coating induces a unique sign reversal in magnetoresistance.
Conclusions:
- GPFE represent a novel, oxidation-resistant spin source for spintronics.
- The developed method facilitates low-cost fabrication of spintronic devices through wet chemistry compatibility.
