Dimensionality effects in the local density of states of ferromagnetic hosts probed via STM: Spin-polarized quantum beats and spin filtering

A. C. Seridonio, S. C. Leandro, L. H. Guessi, E. C. Siqueira, F. M. Souza, E. Vernek, M. S. Figueira, and J. C. Egues
Phys. Rev. B 87, 125104 – Published 5 March 2013

Abstract

We theoretically investigate the local density of states (LDOS) probed by an STM tip of ferromagnetic metals hosting a single adatom and a subsurface impurity. We model the system via the two-impurity Anderson Hamiltonian. By using the equation of motion with the relevant Green's functions, we derive analytical expressions for the LDOS of two host types: a surface and a quantum wire. The LDOS reveals Friedel-like oscillations and Fano interference as a function of the STM tip position. These oscillations strongly depend on the host dimension. Interestingly, we find that the spin-dependent Fermi wave numbers of the hosts give rise to spin-polarized quantum beats in the LDOS. Although the LDOS for the metallic surface shows a damped beating pattern, it exhibits the opposite behavior in the quantum wire. Due to this absence of damping, the wire operates as a spatially resolved spin filter with a high efficiency.

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  • Received 15 November 2012

DOI:https://doi.org/10.1103/PhysRevB.87.125104

©2013 American Physical Society

Authors & Affiliations

A. C. Seridonio1,2, S. C. Leandro1, L. H. Guessi1, E. C. Siqueira1, F. M. Souza3, E. Vernek3, M. S. Figueira4, and J. C. Egues5

  • 1Departamento de Física e Química, Universidade Estadual Paulista, Ilha Solteira, São Paulo 15385-000, Brazil
  • 2Departamento de Física, Instituto de Geociências e Ciências Exatas-IGCE, Universidade Estadual Paulista, Rio Claro, São Paulo 13506-970, Brazil
  • 3Instituto de Física, Universidade Federal de Uberlândia, Uberlândia, Minais Gerais 38400-902, Brazil
  • 4Instituto de Física, Universidade Federal Fluminense, Niterói, Rio de Janeiro 24210-340, Brazil
  • 5Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, São Paulo 13560-970, Brazil

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Issue

Vol. 87, Iss. 12 — 15 March 2013

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