Effect of tip resonances on tunneling anisotropic magnetoresistance in ferromagnetic metal break-junctions

A first-principles study

J. D. Burton, Renat F Sabirianov, J. P. Velev, O. N. Mryasov, E. Y. Tsymbal

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

First-principles calculations of electron tunneling transport in nanoscale Ni and Co break-junctions reveal strong dependence of the conductance on the magnetization direction, an effect known as tunneling anisotropic magnetoresistance (TAMR). An important aspect of this phenomenon stems from resonant states localized in the electrodes near the junction break. The energy and broadening of these states is strongly affected by the magnetization orientation due to spin-orbit coupling, causing TAMR to be sensitive to bias voltage on a scale of a few millivolts. Our results bear a resemblance to recent experimental data and suggest that TAMR driven by resonant states is a general phenomenon typical for magnetic broken contacts. This effect may be observed in any experiment where a magnetic tip is used to probe electron transport, e.g., spin-polarized scanning-tunneling measurements.

Original languageEnglish (US)
Article number144430
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number14
DOIs
StatePublished - Oct 26 2007

Fingerprint

Tunnelling magnetoresistance
Enhanced magnetoresistance
Ferromagnetic materials
Magnetization
metals
Electron tunneling
Bias voltage
magnetization
Orbits
electron probes
electron tunneling
bears
stems
Scanning
Electrodes
orbits
scanning
electrodes
electric potential
Experiments

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Effect of tip resonances on tunneling anisotropic magnetoresistance in ferromagnetic metal break-junctions : A first-principles study. / Burton, J. D.; Sabirianov, Renat F; Velev, J. P.; Mryasov, O. N.; Tsymbal, E. Y.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 76, No. 14, 144430, 26.10.2007.

Research output: Contribution to journalArticle

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