English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We investigate heat and charge transport through a diffusive SIF1F2N tunneljunction, where N (S) is a normal (superconducting) electrode, I is aninsulator layer and F1,2 are two ferromagnets with arbitrary direction ofmagnetization. The flow of an electric current in such structures at subgapbias is accompanied by a heat transfer from the normal metal into thesuperconductor, which enables refrigeration of electrons in the normal metal.We demonstrate that the refrigeration efficiency depends on the strength of theferromagnetic exchange field h and the angle {\alpha} between themagnetizations of the two F layers. As expected, for values of h much largerthan the superconducting order parameter \Delta, the proximity effect issuppressed and the efficiency of refrigeration increases with respect to a NISjunction. However, for h \sim \Delta the cooling power (i.e. the heat flow outof the normal metal reservoir) has a non-monotonic behavior as a function of hshowing a minimum at h \approx \Delta. We also determine the dependence of thecooling power on the lengths of the ferromagnetic layers, the bias voltage, thetemperature, the transmission of the tunneling barrier and the magnetizationmisalignment angle {\alpha}.

Electron cooling in diffusive normal metal - superconductor tunnel junctions with a spin-valve ferromagnetic interlayer