Spin and exchange coupling for Ti embedded in a surface dipolar network

Abstract

We have studied the spin and exchange coupling of Ti atoms on a Cu${}_2$N/Cu(100) surface using density functional theory. We find that individual Ti have a spin of 1.0 (i.e., 2 Bohr Magneton) on the Cu${}_2$N/Cu(100) surface instead of spin-1/2 as found by Scanning Tunneling Microscope. We suggest an explanation for this difference, a two-stage Kondo effect, which can be verified by experiments. By calculating the exchange coupling for Ti dimers on the Cu${}_2$N/Cu(100) surface, we find that the exchange coupling across a `void' of 3.6Å is antiferromagnetic, whereas indirect (superexchange) coupling through a N atom is ferromagnetic. We confirm the existence of superexchange interactions by varying the Ti-N angle in a model trimer calculation. For a square lattice of Ti on Cu${}_2$N/Cu(100), we find a novel spin striped phase.

References in corpus (1)

• The role of magnetic anisotropy in the Kondo effect

Cited by in corpus (3)

• Non-locally sensing the magnetic states of nanoscale antiferromagnets with an atomic spin sensor
• Electronic properties of transition metal atoms on Cu${}_2$N/Cu(100)
• Activated Layered Magnetism from Bulk TiN