Investigation of all niobium nano-SQUIDs based on sub-micrometer cross-type Josephson junctions

被引：21

作者：

Schmelz, M. ^{[1
]}

Matsui, Y. ^{[2
]}

Stolz, R. ^{[1
]}

Zakosarenko, V. ^{[3
]}

Schoenau, T. ^{[1
]}

Anders, S. ^{[1
]}

Linzen, S. ^{[1
]}

Itozaki, H. ^{[2
]}

Meyer, H-G ^{[1
]}

机构：

[1] Leibniz Inst Photon Technol, D-07745 Jena, Germany

[2] Osaka Univ, Grad Sch Engn Sci, Osaka 5608531, Japan

[3] Supracon AG, D-07751 Jena, Germany

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2015年 / 28卷 / 01期

关键词：

nanoSQUID; nanosensor; cross-type Josephson junction; small spin systems; QUANTUM INTERFERENCE DEVICE; MAGNETOMETER; SENSITIVITY; FABRICATION; PHASE;

D O I：

10.1088/0953-2048/28/1/015004

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report on the development of highly sensitive SQUIDs featuring sub-micrometer loop dimensions. The integration of high quality and low capacitance SIS Nb/AlOx/Nb cross-type Josephson tunnel junctions results in white flux noise levels as low as 66 n Phi(0) Hz(-1/2), well below state-of-the-art values of their Nb-based counterparts based on constriction type junctions. Estimation of the spin sensitivity of the best SQUIDs yield S-mu(1/2) < 7 mu(B) Hz(-1/2) in the white noise region, suitable for the investigation of small spin systems. We discuss fabrication challenges, show results on the electrical characterization of devices with various pickup loops, and describe options for further improvement, which may push the sensitivity of such devices even to single spin resolution.

引用

页数：5

共 3 条

[1] A new family of field-stable and highly sensitive SQUID current sensors based on sub-micrometer cross-type Josephson junctions
Schmelz, M.
Zakosarenko, V.
Schoenau, T.
Anders, S.
Kunert, J.
Meyer, M.
Meyer, H-G
Stolz, R.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2017, 30 (07)
[2] Field-stable SQUID magnetometer with sub-fT Hz-1/2 resolution based on sub-micrometer cross-type Josephson tunnel junctions
Schmelz, M.
Stolz, R.
Zakosarenko, V.
Schoenau, T.
Anders, S.
Fritzsch, L.
Mueck, M.
Meyer, H-G
SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2011, 24 (06)
[3] Sub-micrometer-sized, cross-type Nb-AlOx-Nb tunnel junctions with low parasitic capacitance
Anders, S.
Schmelz, M.
Fritzsch, L.
Stolz, R.
Zakosarenko, V.
Schoenau, T.
Meyer, H-G
SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2009, 22 (06)

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