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Defect controlled magnetism in FeP/graphene/Ni(111)
Sumanta Bhandary1, Olle Eriksson, Biplab Sanyal
1Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden.
Scientific Reports
|December 4, 2013
Summary
Defects in graphene can control the magnetic interactions between organometallic complexes and ferromagnetic surfaces, enabling new possibilities for molecular nanospintronics and spin qubit design.
Area of Science:
- Molecular nanospintronics
- Materials science
- Quantum computing
Background:
- Organometallic complexes on ferromagnetic surfaces are key for molecular nanospintronics.
- Graphene acts as a 2D surface for molecular magnets.
- Strain engineering on graphene can tune the spin state of iron porphyrin (FeP) molecules.
Purpose of the Study:
- Investigate the effect of graphene defects on the magnetic interactions between FeP and Ni(111).
- Explore defect-controlled manipulation of molecular magnetism for spintronic applications.
Main Methods:
- Utilized ab initio density functional calculations.
- Simulated FeP molecule on Ni(111) surface with pristine and defective graphene interlayers.
Main Results:
- Pristine graphene results in weak exchange interaction between FeP and Ni(111).
- Graphene defects introduce diverse ferromagnetic and antiferromagnetic exchange interactions.
- Defects control magnetization easy axes, magnetic anisotropy, and spin-dipolar contributions.
Conclusions:
- Graphene defects offer a novel method for manipulating molecular magnetism.
- This approach has potential for designing spin qubits and logic operations in molecular nanospintronics.
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