Spin-triplet supercurrent in Josephson junctions containing a synthetic antiferromagnet with perpendicular magnetic anisotropy
| Autor: | N. Missert, Samuel Edwards, Victor Aguilar, Demet Korucu, Bethany Niedzielski, Paul G. Kotula, Reza Loloee, William P. Pratt, Norman O. Birge, Joseph A. Glick |
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| Rok vydání: | 2017 |
| Předmět: |
Josephson effect
Physics Condensed matter physics Condensed Matter - Superconductivity Mathematics::Number Theory Supercurrent FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 01 natural sciences Nanomagnet Pi Josephson junction Superconductivity (cond-mat.supr-con) Ferromagnetism Condensed Matter::Superconductivity 0103 physical sciences Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Cooper pair 010306 general physics 0210 nano-technology Spin (physics) |
| DOI: | 10.48550/arxiv.1710.07247 |
| Popis: | We present measurements of Josephson junctions containing three magnetic layers with noncolinear magnetizations. The junctions are of the form $S/F^{\prime}/N/F/N/F^{\prime \prime}/S$, where $S$ is superconducting Nb, $F^\prime$ is either a thin Ni or Permalloy layer with in-plane magnetization, $N$ is the normal metal Cu, $F$ is a synthetic antiferromagnet (SAF) with magnetization perpendicular to the plane, composed of Pd/Co multilayers on either side of a thin Ru spacer, and $F^{\prime \prime}$ is a thin Ni layer with in-plane magnetization. The supercurrent in these junctions decays more slowly as a function of the $F$-layer thickness than for similar spin-singlet junctions not containing the $F^\prime$ and $F^{\prime \prime}$ layers. The slower decay is the prime signature that the supercurrent in the central part of these junctions is carried by spin-triplet pairs. The junctions containing $F^{\prime}=$ Permalloy are suitable for future experiments where either the amplitude of the critical current or the ground-state phase difference across the junction is controlled by changing the relative orientations of the magnetizations of the $F^{\prime}$ and $F^{\prime \prime}$ layers. Comment: 11 pages, 8 figures |
| Databáze: | OpenAIRE |
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