Long range spin supercurrents in ferromagnetic CrO2 using a multilayer contact structure

M.S. Anwar, M. Veldhorst, Alexander Brinkman, J. Aarts

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Abstract

We report measurements of long ranged supercurrents through ferromagnetic and fully spin-polarized CrO2 deposited on TiO2 substrates. In earlier work, we found supercurrents in films grown on sapphire but not on TiO2. Here, we employed a special contact arrangement, consisting of a Ni/Cu sandwich between the film and the superconducting amorphous Mo70Ge30 electrodes. The distance between the contacts was almost a micrometer, and we find the critical current density to be significantly higher than found in the films deposited on sapphire. We argue this is due to spin mixing in the Ni/Cu/CrO2 layer structure, which is helpful in the generation of the odd-frequency spin triplet correlations needed to carry the supercurrent.
Original languageEnglish
Article number052602
Pages (from-to)052602-
Number of pages3
JournalApplied physics letters
Volume100
Issue number5
DOIs
Publication statusPublished - 2012

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electric contacts
sapphire
micrometers
critical current
current density
electrodes

Keywords

  • METIS-286922
  • IR-84690

Cite this

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abstract = "We report measurements of long ranged supercurrents through ferromagnetic and fully spin-polarized CrO2 deposited on TiO2 substrates. In earlier work, we found supercurrents in films grown on sapphire but not on TiO2. Here, we employed a special contact arrangement, consisting of a Ni/Cu sandwich between the film and the superconducting amorphous Mo70Ge30 electrodes. The distance between the contacts was almost a micrometer, and we find the critical current density to be significantly higher than found in the films deposited on sapphire. We argue this is due to spin mixing in the Ni/Cu/CrO2 layer structure, which is helpful in the generation of the odd-frequency spin triplet correlations needed to carry the supercurrent.",
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Long range spin supercurrents in ferromagnetic CrO2 using a multilayer contact structure. / Anwar, M.S.; Veldhorst, M.; Brinkman, Alexander; Aarts, J.

In: Applied physics letters, Vol. 100, No. 5, 052602, 2012, p. 052602-.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Long range spin supercurrents in ferromagnetic CrO2 using a multilayer contact structure

AU - Anwar, M.S.

AU - Veldhorst, M.

AU - Brinkman, Alexander

AU - Aarts, J.

PY - 2012

Y1 - 2012

N2 - We report measurements of long ranged supercurrents through ferromagnetic and fully spin-polarized CrO2 deposited on TiO2 substrates. In earlier work, we found supercurrents in films grown on sapphire but not on TiO2. Here, we employed a special contact arrangement, consisting of a Ni/Cu sandwich between the film and the superconducting amorphous Mo70Ge30 electrodes. The distance between the contacts was almost a micrometer, and we find the critical current density to be significantly higher than found in the films deposited on sapphire. We argue this is due to spin mixing in the Ni/Cu/CrO2 layer structure, which is helpful in the generation of the odd-frequency spin triplet correlations needed to carry the supercurrent.

AB - We report measurements of long ranged supercurrents through ferromagnetic and fully spin-polarized CrO2 deposited on TiO2 substrates. In earlier work, we found supercurrents in films grown on sapphire but not on TiO2. Here, we employed a special contact arrangement, consisting of a Ni/Cu sandwich between the film and the superconducting amorphous Mo70Ge30 electrodes. The distance between the contacts was almost a micrometer, and we find the critical current density to be significantly higher than found in the films deposited on sapphire. We argue this is due to spin mixing in the Ni/Cu/CrO2 layer structure, which is helpful in the generation of the odd-frequency spin triplet correlations needed to carry the supercurrent.

KW - METIS-286922

KW - IR-84690

U2 - 10.1063/1.3681138

DO - 10.1063/1.3681138

M3 - Article

VL - 100

SP - 052602-

JO - Applied physics letters

JF - Applied physics letters

SN - 0003-6951

IS - 5

M1 - 052602

ER -