# Superconductor-ferromagnet tunnel junction thermoelectric bolometer and calorimeter with a SQUID readout

## TL;DR

This paper explores a novel superconductor-ferromagnet thermoelectric detector with potential for high sensitivity, analyzing its noise, energy resolution, and SQUID readout feasibility through numerical simulations.

## Contribution

It provides the first detailed numerical analysis of SFTED performance metrics and practical design considerations for fabrication and SQUID readout integration.

## Key findings

- Noise equivalent power comparable to existing detectors
- Energy resolution suitable for sensitive radiation detection
- Feasibility of SQUID readout in bolometric and calorimetric modes

## Abstract

Superconductor-ferromagnet thermoelectric detector (SFTED) is a novel ultrasensitive radiation detector based on the giant thermoelectric effect in superconductor-ferromagnet tunnel junctions. This type of detector can be operated without the need of additional bias lines, and is predicted to provide a performance rivaling transition-edge sensors and kinetic inductance detectors. Here we report our numerical studies on the SFTED noise equivalent power, energy resolution and time constant, and the feasibility of a SQUID readout in both bolometric and calorimetric regimes, with the goal to provide practical design parameters for the detector fabrication and the readout circuitry implementation.