Andreev nanoprobe of half-metallic CrO$_{2}$ films using superconducting cuprate tips

Details Andreev nanoprobe of half-metallic CrO$_{2}$ films using superconducting cuprate tips Andreev nanoprobe of half-metallic CrO$_{2}$ films using superconducting cuprate tips

2011-10-23

arxiv.org/abs/1110.5010v1

Physics

Condensed Matter

Superconductivity

To appear in Applied Physics Letters; 4 pages, 4 figures

Scientific paper

Superconducting tips of YBa$_{2} $Cu$_{3}$O$_{7-x}$ were used to perform point-contact Andreev reflection spectroscopy on half-metallic CrO$_{2}$ thin films. At 4.2K, strong suppression of the d-wave Andreev reflection characteristics was observed, consistent with the high spin polarization of CrO$_{2}$. Our technique was validated by comparison with data taken on non-magnetic Au films, and with data taken by superconducting Pb tips. The point contacts were estimated to be $\lesssim$ 10nm in size, attesting to their ballistic and microscopic nature. Our results demonstrate the feasibility of using superconducting cuprate tips as spin-sensitive nanoprobes of ferromagnets.

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