研究目的
Investigating the magnetic properties and exchange interaction in HoCo dimers as a model system for the smallest intermetallic compound of a lanthanide and a transition metal atom.
研究成果
The study successfully detects spin excitations in HoCo dimers, revealing ferromagnetic coupling between Ho and Co atoms. This provides unprecedented access to the magnetic level diagram and internal magnetic coupling in rare earth based nanostructures.
研究不足
The detection of spin-excitations in 4f atoms is challenging due to the vanishing contribution of the 4f electrons to the tunnel current. The study is limited to the specific system of HoCo dimers on MgO/Ag(100).
1：Experimental Design and Method Selection:
The study employs scanning tunneling spectroscopy (STS) to detect inelastic excitations and applies an external magnetic field to prove their magnetic origin. Density functional theory (DFT) and spin Hamiltonian analysis are used to determine the magnetic level distribution and exchange interaction.
2：Sample Selection and Data Sources:
HoCo dimers are adsorbed on ultrathin MgO(100) films grown on Ag(100). Samples are prepared with only Ho or only Co for comparison.
3：0). Samples are prepared with only Ho or only Co for comparison.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: A home-built STM at 0.4 K and up to 8 T is used. MgO(100) thin films on Ag(100) serve as substrates.
4：4 K and up to 8 T is used. MgO(100) thin films on Ag(100) serve as substrates.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Ho and Co atoms are codeposited onto cold substrates. STM images and dI/dV spectra are recorded to identify and characterize the dimers.
5：Data Analysis Methods:
The magnetic field dependent conductance steps are analyzed using an effective spin Hamiltonian model with input from DFT calculations.
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