Substrate-determined exchange interactions between an STM tip and an adatom

Kun Tao, Yinye Yu, Wenxuan Zhang, Chenglong Jia, Desheng Xue, and V. S. Stepanyuk
Phys. Rev. B 97, 224411 – Published 12 June 2018

Abstract

By performing ab initio calculations, we reveal an unexpected behavior of the exchange interactions between the Fe STM tip and the Fe adatom on Cu(001) and on a Cu2N monolayer on Cu(001) surfaces [denoted as Cu2N/Cu(001)]. A tip-adatom distance-dependent antiferromagnetic-ferromagnetic transition and antiferromagnetic exchange interactions between the tip and the adatom are found for these two junctions, respectively. We demonstrate that the different exchange interactions in these systems are determined by the competition between the tip-adatom and the adatom-substrate interactions. Based on transport calculations, we found that the spin polarization and magnetoresistance in the junction on the Cu(001) system and on the Cu2N/Cu(001) system depend on the tip-adatom distance.

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  • Received 22 March 2018
  • Revised 10 May 2018

DOI:https://doi.org/10.1103/PhysRevB.97.224411

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Kun Tao1,2, Yinye Yu1, Wenxuan Zhang1, Chenglong Jia1, Desheng Xue1, and V. S. Stepanyuk2

  • 1Key Lab for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, China
  • 2Max-Planck-Institute of Microstructure Physics, Halle, Germany

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Issue

Vol. 97, Iss. 22 — 1 June 2018

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