Evidence for crossed Andreev reflection in superconductor-ferromagnet hybrid structures

Beckmann D, Weber HB, von Löhneysen H (2004)

Publication Status: Published

Publication Type: Journal article, Letter

Publication year: 2004

Journal

Physical Review Letters American Physical Society

Publisher: AMERICAN PHYSICAL SOC

Book Volume: 93

Journal Issue: 19

DOI: 10.1103/PhysRevLett.93.197003

Abstract

We have measured the nonlocal resistance of aluminum-iron spin-valve structures fabricated by e-beam lithography and shadow evaporation. The sample geometry consists of an aluminum bar with two or more ferromagnetic wires forming point contacts to the aluminum at varying distances from each other. In the normal state of aluminum, we observe a spin-valve signal which allows us to control the relative orientation of the magnetizations of the ferromagnetic contacts. In the superconducting state, at low temperatures and excitation voltages well below the gap, we observe a spin-dependent nonlocal resistance which decays on a smaller length scale than the normal-state spin-valve signal. The sign, magnitude, and decay length of this signal are consistent with predictions made for crossed Andreev reflection.

Authors with CRIS profile

Heiko Weber Chair of Applied Physics

Involved external institutions

Karlsruhe Institute of Technology (KIT) DE Germany (DE)

How to cite

APA:

Beckmann, D., Weber, H.B., & von Löhneysen, H. (2004). Evidence for crossed Andreev reflection in superconductor-ferromagnet hybrid structures. Physical Review Letters, 93(19). https://dx.doi.org/10.1103/PhysRevLett.93.197003

MLA:

Beckmann, Detlef, Heiko B. Weber, and Hilbert von Löhneysen. "Evidence for crossed Andreev reflection in superconductor-ferromagnet hybrid structures." Physical Review Letters 93.19 (2004).

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