Sign reversal of spin polarization in Co/Ru/Al2O3/Co magnetic tunnel junctions

P.R. LeClair; B. Hoex; H. Wieldraaijer; J.T. Kohlhepp; H.J.M. Swagten; W.J.M. Jonge, de

doi:10.1103/PhysRevB.64.100406

Sign reversal of spin polarization in Co/Ru/Al2O3/Co magnetic tunnel junctions

P.R. LeClair, B. Hoex, H. Wieldraaijer, J.T. Kohlhepp, H.J.M. Swagten, W.J.M. Jonge, de

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Abstract

Utilizing ultrathin Ru interfacial layers in Co/Al2O3/Co tunnel junctions, we demonstrate that not only does the tunnel magnetoresistance decrease strongly as the Ru thickness increases as found for Cu or Cr interlayers, in contrast, even the sign of the apparent tunneling spin polarization may be changed. Further, the magnitude and sign of the apparent polarization is strongly dependent on applied voltage. The results are explained by a strong density-of-states modification at the (interdiffused) Co/Ru interface, consistent with theoretical calculations and experiments on Co/Ru metallic multilayers and Co-Ru alloys.

Original language	English
Article number	100406
Pages (from-to)	100406-1/4
Number of pages	4
Journal	Physical Review B
Volume	64
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.64.100406
Publication status	Published - 1 Jan 2001

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abstract = "Utilizing ultrathin Ru interfacial layers in Co/Al2O3/Co tunnel junctions, we demonstrate that not only does the tunnel magnetoresistance decrease strongly as the Ru thickness increases as found for Cu or Cr interlayers, in contrast, even the sign of the apparent tunneling spin polarization may be changed. Further, the magnitude and sign of the apparent polarization is strongly dependent on applied voltage. The results are explained by a strong density-of-states modification at the (interdiffused) Co/Ru interface, consistent with theoretical calculations and experiments on Co/Ru metallic multilayers and Co-Ru alloys.",

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AU - Swagten, H.J.M.

AU - Jonge, de, W.J.M.

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Sign reversal of spin polarization in Co/Ru/Al2O3/Co magnetic tunnel junctions

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