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We are developing X-ray microcalorimeters as a backup option for the baselinedetectors in the X-IFU instrument on board the ATHENA space mission led by ESAand to be launched in the early 2030s.5$\times$5 mixed arrays with TiAutransition-edge sensor (TES), which have different high aspect ratios and thushigh resistances, have been designed and fabricated to meet the energyresolution requirement of the X-IFU instrument. Such arrays can also be used tooptimise the performance of the Frequency Domain Multiplexing (FDM) readout andlead to the final steps for the fabrication of a large detector array. In thiswork we present the experimental results from tens of the devices with anaspect ratio (length-to-width) ranging from 1-to-1 up to 6-to-1, measured in asingle-pixel mode with a FDM readout system developed at SRON/VTT. We observeda nominal energy resolution of about 2.5 eV at 5.9 keV at bias frequenciesranging from 1 to 5 MHz. These detectors are proving to be the best TESmicrocalorimeters ever reported in Europe, being able to meet not only therequirements of the X-IFU instrument, but also those of other futurechallenging X-ray space missions, fundamental physics experiments, plasmacharacterization and material analysis.

Characterization of high aspect ratio TiAu TES X-ray microcalorimeters array using the X-IFU Frequency Domain Multiplexing readout