Abstract
In the last years metallic magnetic calorimeters (MMC) showed an energy resolution of a few eV for x-rays up to 10 keV. This makes MMCs a promising and powerful tool for many applications where photons or energetic massive particles have to be detected—like absolute activity measurements of radioactive isotopes, high resolution x-ray spectroscopy and x-ray fluorescence material analysis. However, in order to fulfill all requirements of these applications and to allow to reach the maximum resolving power a consequent micro-fabrication of the MMC detectors is needed. The micro-fabrication of metallic magnetic calorimeters requires reliable deposition and patterning processes for niobium structures with high critical currents and for paramagnetic sensors.
As one result of our advances in microstructuring a fully microfabricated MMC which consists of a meander shaped niobium thin film pickup coil and a 3 μm thick sputter deposited paramagnetic Au:Er temperature sensor will be presented. Deposition of energy in the paramagnetic sensor causes a rise in temperature and results in a change of magnetization, which is measured by a low noise high bandwidth dc-SQUID. The sputter deposited Au:Er films we report on are working well and show thermodynamic properties close to the ones known from bulk material down to temperatures of 45 mK.
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Burck, A., Kempf, S., Schäfer, S. et al. Microstructured Magnetic Calorimeter with Meander-Shaped Pickup Coil. J Low Temp Phys 151, 337–344 (2008). https://doi.org/10.1007/s10909-007-9659-4
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DOI: https://doi.org/10.1007/s10909-007-9659-4
Keywords
- MMC
- Metallic magnetic calorimeter
- Low temperature detectors
- Rare earth alloys
- Gold-erbium alloy
- X-ray spectroscopy