Ultrasensitive Broad Band SQUID Microsusceptometer for Magnetic Measurements at Very Low Temperatures

被引：10

作者：

Jose Martinez-Perez, Maria ^{[1
,2
]}

Sese, Javier ^{[3
]}

Luis, Fernando ^{[1
,2
]}

Cordoba, Rosa ^{[3
]}

Drung, Dietmar ^{[4
]}

Schurig, Thomas ^{[4
]}

Bellido, Elena ^{[6
]}

de Miguel, Rocio ^{[3
]}

Gomez-Moreno, Carlos ^{[3
]}

Lostao, Anabel ^{[5
]}

Ruiz-Molina, Daniel ^{[6
]}

机构：

[1] Univ Zaragoza, Inst Ciencia Mat Aragon, E-50009 Zaragoza, Spain

[2] Univ Zaragoza, Dept Fis Mat Condensada, E-50009 Zaragoza, Spain

[3] Univ Zaragoza, Inst Univ Invest Nanociencia Aragon, Zaragoza 50018, Spain

[4] Phys Tech Bundesanstalt, D-10587 Berlin, Germany

[5] Agencia Aragonesa Invest & Desarrollo ARAID, Zaragoza 50004, Spain

[6] Ctr Invest Nanociencia & Nanotecnol, Cerdanyola Del Valles 08193, Spain

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 2011年 / 21卷 / 03期

关键词：

Magnetic susceptibility; nanotechnology; SQUIDs; QUANTUM INTERFERENCE; BEAM;

D O I：

10.1109/TASC.2010.2082479

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

In this work we report the development and calibration of an ultrasensitive SQUID susceptometer capable of operating over an extremely wide frequency range (0.001 Hz-1 MHz) at extremely low temperatures (13 mK). Starting with 2-stage SQUID sensors fabricated at PTB-Berlin, an integrated susceptometer with experimental spin sensitivity of 10(4) Bohr magneton/Hz(1/2) is obtained by rerouting some SQUID input circuit connections. Modification of the chips is carried out using Focused Ion Beam Induced Deposition (FIBID) of amorphousW, using W(CO)(6) as precursor gas. We have demonstrated that superconducting connections between W FIBID lines and Nb films can be fabricated and that they operate at 4.2 K, providing a powerful technique for fixing errors in device designs, repairing damaged circuits, or modifying existing ones. The microsusceptometer offers new possibilities in the study of thin films or even monolayers of nanosized magnets, and has potential applications in diverse fields such as quantum computing, high-density information storage or on-chip magnetic refrigeration.

引用

页码：345 / 348

页数：4

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