Phase-tunable colossal magneto-heat resistance in ferromagnetic Josephson thermal valves
Abstract
We propose a heat valve based on the interplay between thermal transport and proximity-induced exchange splitting in Josephson tunnel junctions. We demonstrate that the junction heat conductance strongly depends on the relative alignment of the exchange fields induced in the superconductors. Colossal magneto-heat resistance ratios as large as 10^7% are predicted to occur under proper temperature and phase conditions, as well as suitable ferromagnet-superconductor combinations. Moreover, the quantum phase tailoring, intrinsic to the Josephson coupling, offers an additional degree of freedom for the control of the heat conductance. Our predictions for the phase-coherent and spin-dependent tuning of the thermal flux can provide a useful tool for heat management at the nanoscale.
Keywords
Cite
@article{arxiv.1211.6570,
title = {Phase-tunable colossal magneto-heat resistance in ferromagnetic Josephson thermal valves},
author = {F. Giazotto and F. S. Bergeret},
journal= {arXiv preprint arXiv:1211.6570},
year = {2013}
}
Comments
4.5 pages, 3 color figures