Metallic magnetic calorimeters (MMC) for high resolution x-ray spectroscopy Loredana GASTALDO, Markus LINCK, Sönke SCHÄFER, Hannes ROTZINGER, Andreas BURCK,

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Presentation transcript:

Metallic magnetic calorimeters (MMC) for high resolution x-ray spectroscopy Loredana GASTALDO, Markus LINCK, Sönke SCHÄFER, Hannes ROTZINGER, Andreas BURCK, Sebastian KEMPF, Jan-Patrick PORST, Andreas FLEISCHMANN, Christian ENSS, George M. SEIDEL

Inverse Temperature T  1 [K  1 ] Magnetization M [A/m] Au:Er 300 ppm Temperature T [mK] Specific heat C [10  4 J mol  1 K  1 ] Au:Er 300 ppm Detector setup Thermodynamic properties of interacting spins (RKKY) can be calculated with confidence by mean field approximations or Monte Carlo simulations optimization by numerical methods is possible mK 4.2 K 300 K B Very stable material suitable for long lasting measurements

Fluctuations of energy in a canonical ensemble Magnetic Johnson noise (thermal currents in the metallic sensor ) Flux noise of the SQUID-magnetometer energy sensitivity close to quantum limit required, 1/f noise sensor electron SQUID (order of magnitude: 1eV for a 10 keV x-ray detector) C abs C spins Noise & energy resolution

Aluminum thin window Lead Collimator Brass holder Circuit board Field coil Superconducting shield (lead) Detector set-up Detector SQUID: KSUP (IBM) Amplifier SQUID: CCBlue (IPHT Jena) Sensor  Au:Er 600 ppm  x (12.5) 2 x 8  m 3 Absorber  Au 180 x 180 x 5  m 3 stopping power above 6 keV Pulses acquired at different temperatures and at different magnetic fields Detector SQUID

Magnetization and chip temperature Magnetic Flux T bath [K] T chip [K] Dissipation on the SQUID chip leads to a decoupling of the chip temperature from the bath temperature

Pulse analysis Rise time 100  s fast decay time 650  s Decay time slow decay time 8.1 ms Time t [ms] The amplitude of pulses saturates at low temperatures and high fields Temperature T [mK]

55 Fe energy spectrum Counts / 2 eV Counts / 15 eV Energy E [keV] Very low background A  keV B  keV Energy [keV] Transition

Energy resolution and linearity Counts / 0.24 eV Counts / 0.12 eV Energy Energy E [keV] Relative pulse amplitude A Measured energy E exp [keV] Difference [eV] Energy E [keV] A - A i TFN  0.38 eV + SQUID  1.14 eV + 1/f  1.6 eV ???? 1.85 eV still missing! 1/f 2 due to temperature fluctuations of the chip

Conclusion and future plans 2,7 eV energy resolution is a good result but it does not rapresent the limit of magnetic calorimeters Improvements of our detector will follow the good results we are obtaining with microstructuring techniques Er enriched Au:Er sputter target -Sputtered Au:Er sensor -Overhanging absorber