Thin-Film Microsusceptometer With Integrated Nanoloop
| Autor: | Thomas Schurig, Fernando Luis, Jan-Hendrik Storm, F. Ruede, M. Regin, Alexander Kirste, Ana Repollés, Javier Sesé, Dietmar Drung |
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| Přispěvatelé: | European Commission, Ministerio de Economía y Competitividad (España) |
| Rok vydání: | 2014 |
| Předmět: |
Permalloy
Josephson effect Materials science Analytical chemistry 02 engineering and technology 01 natural sciences Focused ion beam Noise (electronics) Bohr magneton symbols.namesake Nuclear magnetic resonance 0103 physical sciences Sensitivity (control systems) Thin film Electrical and Electronic Engineering 010306 general physics Physics business.industry Order (ring theory) 021001 nanoscience & nanotechnology Condensed Matter Physics Electronic Optical and Magnetic Materials Magnetic field Inductance symbols Optoelectronics Atomic physics 0210 nano-technology business Sensitivity (electronics) Excitation |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 1558-2515 1051-8223 |
| Popis: | Trabajo presentado al 14th International Superconductive Electronics Conference (ISEC), celebrado en Cambridge, Massachusetts (EE. UU.) del 7 al 11 de julio de 2013.-- et al. We report the design and performance of thin-film microsusceptometers intended for magnetic measurements on samples at variable temperature down to the low mK range and excitation frequencies of up to about 1 MHz. The devices are realized as first-order gradiometers with two circular loops of 60 μm or 30 μm average diameter resulting in a total inductance of 360 pH or 250 pH, respectively. An integrated excitation coil generates a magnetic field with a sensitivity of 0.1 T/A at the sample position, whereas the Josephson junctions are located in a field-reduced area. The susceptometers are fabricated by a conventional Nb/AlOx/Nb trilayer process. In order to enhance the sensitivity to the level required for the measurement of sub-μm samples, an extra detection loop of about 450 nm inner diameter was integrated into one of the pickup loops by using a focused ion beam (FIB). We show that this device is able of detecting signals from very small permalloy samples. An improved susceptometer design for equipment with integrated nanoloops is also presented, for which a total inductance of 50 pH is predicted. This work was partly funded by the European Microkelvin Collaboration within the 7th Framework Programme of the European Commission (Grant number 228464), by the Spanish Ministry of Economy and Competitiveness (Grant MAT2012-38318-C03), and by the EMRP (EMRP: European Metrology Research Programme) project MetNEMS NEW08. The EMRP is jointly funded by the EMRP participating countries within EURAMET and the European Union. |
| Databáze: | OpenAIRE |
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