What is it about?
We performed the DFT analysis for graphene adsorbed on an NiFe alloy and revealed that the Ni-rich surfaces are preferable regardless of compositions of substrates for bare substrates while the Fe-rich surfaces are stable for graphene adsorbed substrates due to the hybridization of pz orbital of C atom and dz2 orbital of Fe atom.
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Why is it important?
There are two fabrication processes of the graphene/ferromagnetic alloy interface: one is the transfer of graphene, and the other is the evaporation of alloys onto graphene. Our systematic DFT calculations derived universal findings in graphene/metal interface that the surface compositions, which dominate the magnetic moments, are controlled by these fabrication processes
Perspectives
Our findings will stimulate experimental researchers to fabricate NiFe based MTJ devices with high magnetic ordering and theoretical researchers to design novel interface structures using two-dimensional materials, e.g., h-BN and TMDs. In addition, the developments of new MRAM devices are expected to derive innovations in low-power and high-density memory devices for the information society.
Naohiro Matsumoto
Kobe University
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This page is a summary of: Theoretical investigation of interface atomic structure of graphene on NiFe alloy substrate, Journal of Applied Physics, September 2025, American Institute of Physics,
DOI: 10.1063/5.0283881.
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