A drop of hyperfine field at Sn in Fe/Cr/Sn/Cr multilayers

TL;DR

This study uses first-principles calculations to investigate the magnetic properties of Fe/Cr/Sn/Cr multilayers, revealing two magnetic solutions and the impact of interface roughness on hyperfine fields at Sn.

Contribution

It provides new insights into the magnetic behavior and hyperfine interactions in multilayer systems with incommensurate spin density waves and interface roughness effects.

Findings

Two magnetic solutions exist in the system, related to antiferromagnetic order and ISDW.

Incommensurate spin density wave can occur in thin Cr layers.

Interface roughness significantly decreases the hyperfine field at Sn.

Abstract

The magnetism of the Fe/Cr/Sn/Cr multilayers was studied by first-principles functional theory. The calculations by LAPW and SKKR methods showed that two solutions exist in the $Fe_9/Cr_{14}/Sn/Cr_2$ system. One of them is originated from the antiferromagnetic order in the bulk Cr, and the other is connected with incommensurate spin density wave (ISDW) in Cr. A characteristic feature of this system is realization of ISDW in the Cr film thinner than the half length period of a common ISDW in Cr. In the Cr layers with width lower than a quarter of the wave, the ISDW cannot be the cause of the sharp drop of the HFF at Sn. The calculations of the system $Fe_3/Cr_8/Sn/Cr_8$ with and without allowance for the roughness at the Fe/Cr interface showed that the roughness leads to a significant decrease in the HFF at Sn.