Spatially modulated tunnel magnetoresistance on the nanoscale

Hirofumi Oka, Kun Tao, Sebastian Wedekind, Guillemin Rodary, Valeri S. Stepanyuk, Dirk Sander, Jürgen Kirschner

研究成果: Article査読

19 被引用数 (Scopus)

抄録

We investigate the local tunnel magnetoresistance (TMR) effect within a single Co nanoisland using spin-polarized scanning tunneling microscopy. We observe a clear spatial modulation of the TMR ratio with an amplitude of ∼20% and a spacing of ∼1.3nm between maxima and minima around the Fermi level. This result can be ascribed to a spatially modulated spin polarization within the Co island due to spin-dependent quantum interference. Our combined experimental and theoretical study reveals that spin-dependent electron confinement affects all transport properties such as differential conductance, conductance, and TMR. We demonstrate that the TMR within a nanostructured magnetic tunnel junction can be controlled on a length scale of 1 nm through spin-dependent quantum interference.

本文言語English
論文番号187201
ジャーナルPhysical review letters
107
18
DOI
出版ステータスPublished - 2011 10月 25
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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