Ferromagnetic one dimensional Ti atomic chain

TL;DR

This study reveals that a one-dimensional Ti atomic chain exhibits ferromagnetism on NiAl(110) surfaces due to preserved exchange interactions, with magnetic dipole interactions influencing anisotropy.

Contribution

First demonstration of ferromagnetism in 1D Ti atomic chains on NiAl(110) surfaces, highlighting the role of exchange interactions and magnetic dipole effects.

Findings

Ti atomic chain is ferromagnetic on NiAl(110) surface

The m=|2| state dominates magnetic moment contributions

Magnetic dipole interaction influences anisotropy, not spin-orbit coupling

Abstract

Using the full potential linearized augmented plane wave (FLAPW) method, we have explored the magnetic properties of one dimensional (1D) Ti atomic chain. Astonishingly, we for the first time observed that the 1D Ti atomic chain has ferromagnetic ground state even on NiAl(110) surface although the Ti has no magnetic moment in bulk or macroscopic state. It was found that the physical property of direct exchange interaction among Ti atoms occurred in free standing state is well preserved on NiAl(110) surface and this feature has an essential role in ferromagnetism of 1D Ti atomic chain. It was shown that the m=$|2|$ state has the largest contribution to the magnetic moment of Ti atom grown on NiAl(110) surface. In addition, we found that the magnetic dipole interaction is a key factor in the study of magnetic anisotropy, not the magnetocrystalline anisotropy arising from spin-orbit interaction.