Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 15: Superconductivity: Poster Session

TT 15.56: Poster

Dienstag, 26. Februar 2008, 14:00–18:00, Poster B

Microstructured metallic magnetic calorimeter with meander shaped pickup coil — •Sebastian Kempf, Andreas Burck, Christian Domesle, Christian Höhn, Stefan Lausberg, Lena Maerten, Andreas Pabinger, Christian Pies, Jan-Patrick Porst, Sönke Schäfer, Richard Weldle, Thomas Wolf, Andreas Fleischmann, Loredana Fleischmann, and Christian Enss — Kirchoff-Institute for Physics, Heidelberg, Germany

It was recently shown that metallic magnetic calorimeters (MMC) are a promising and powerful tool for many applications. A MMC consists of an absorber for the particles to be detected and a paramagnetic temperature sensor positioned in a weak magnetic field. According to the calorimetric detection principle, the deposition of energy in the detector due to the impact of a massive particle or the absorption of an x-ray photon causes a rise of temperature and results in a change of magnetization of the sensor. This is detected as a change of magnetic flux in a low-noise high-bandwidth dc-SQUID magnetometer and serves as a precise measure of the deposited energy.
We present a fully microstructured MMC which consists of a gold absorber, a 3 µ m thick sputter-deposited paramagnetic Au:Er-sensor and a meander shaped niobium thin film pickup coil. By means of temperature dependent measurements of magnetization and detector signal size we will compare the thermodynamic properties of the sputtered sensor material to the properties of bulk material. We discuss the achieved energy resolution, the noise of the detector signal and the shape of the detector response as a function of temperature and magnetic field.