Structural and magnetic properties of FeMn${}_x$ ($x=$1...6) chains supported on Cu${}_2$N / Cu (100)

Abstract

Heterogeneous atomic magnetic chains are built by atom manipulation on a Cu${}_2$N/Cu (100) substrate. Their magnetic properties are studied and rationalized by a combined scanning tunneling microscopy (STM) and density functional theory (DFT) work completed by model Hamiltonian studies. The chains are built using Fe and Mn atoms ontop of the Cu atoms along the N rows of the Cu${}_2$N surface. Here, we present results for FeMn${}_x$ ($x$=1...6) chains emphasizing the evolution of the geometrical, electronic, and magnetic properties with chain size. By fitting our results to a Heisenberg Hamiltonian we have studied the exchange-coupling matrix elements $J$ for different chains. For the shorter chains, $x\le 2$, we have included spin-orbit effects in the DFT calculations, extracting the magnetic anisotropy energy. Our results are also fitted to a simple anisotropic spin Hamiltonian and we have extracted values for the longitudinal-anisotropy $D$ and transversal-anisotropy $E$ constants. These parameters together with the values for $J$ allow us to compute the magnetic excitation energies of the system and to compare them with the experimental data.

10 pages 8 figures

References in corpus (5)

• Spin Excitations and Correlations in Scanning Tunneling Spectroscopy
• Excitation of local magnetic moments by tunnelling electrons
• Parity effect in ground state localization of antiferromagnetic chains coupled to a ferromagnet
• Electronic and Magnetic Properties of single Fe atoms on a CuN Surface; Effects of Electron Correlations
• Electronic structure of atomic manganese chains supported on Cu${}_2$N / Cu (100)

Cited by in corpus (8)

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• Magnetic properties of the finite-length biatomic chains in the framework of the single domain-wall approximation
• Relaxation and decoherence of qubits encoded in collective states of engineered magnetic structures
• Spin Excitations of High Spin Iron(II) in Metal-Organic Chains on Metal and Superconductor
• First-principles study of electronic and magnetic properties of Fe atoms on Cu2N/Cu(100)