Development of Magnetization Measurement Devices Using Micro-dc-SQUIDs and a Sr2RuO4 Microplate

Y. Nago; T. Shinozaki; S. Tsuchiya; R. Ishiguro; H. Kashiwaya; S. Kashiwaya; S. Nomura; K. Kono; H. Takayanagi; Y. Maeno

doi:10.1007/s10909-016-1530-z

Development of Magnetization Measurement Devices Using Micro-dc-SQUIDs and a Sr₂RuO₄ Microplate

Y. Nago, T. Shinozaki, S. Tsuchiya, R. Ishiguro, H. Kashiwaya, S. Kashiwaya, S. Nomura, K. Kono, H. Takayanagi, Y. Maeno

Department of Physics

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

We developed high-sensitivity magnetization measurement devices composed of micro-dc-SQUIDs and a superconducting Sr (Formula presented.) RuO (Formula presented.) microplate, aiming to investigate novel magnetic properties related to a spin-triplet chiral p-wave superconductor with a mesoscopic size. Micron-sized dc-SQUID was fabricated by thin Al electrodes, and the SQUID structure was improved to prevent magnetic fluxes from intruding into SQUID electrodes. A Sr (Formula presented.) RuO (Formula presented.) superconducting microplate was fabricated into the size as small as the SQUID loop using a focused ion beam and directly mounted on the SQUID with precise positioning for high-sensitivity magnetization measurements. In the preliminary magnetization measurements of this device, we observed vortices trapped into the plate and thus the lower critical field. The improved magnetization measurement device developed to exclude undesirable flux intrusion successfully enabled high-sensitivity detection of quantized vortex.

Original language	English
Pages (from-to)	292-299
Number of pages	8
Journal	Journal of Low Temperature Physics
Volume	183
Issue number	3-4
DOIs	https://doi.org/10.1007/s10909-016-1530-z
Publication status	Published - 2016 May 1

Keywords

Chiral p-wave superconductor
Mesoscopic superconductor
Quantized vortex
Superconducting quantum interference device

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Materials Science(all)
Condensed Matter Physics

Access to Document

10.1007/s10909-016-1530-z

Cite this

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title = "Development of Magnetization Measurement Devices Using Micro-dc-SQUIDs and a Sr2RuO4 Microplate",

abstract = "We developed high-sensitivity magnetization measurement devices composed of micro-dc-SQUIDs and a superconducting Sr (Formula presented.) RuO (Formula presented.) microplate, aiming to investigate novel magnetic properties related to a spin-triplet chiral p-wave superconductor with a mesoscopic size. Micron-sized dc-SQUID was fabricated by thin Al electrodes, and the SQUID structure was improved to prevent magnetic fluxes from intruding into SQUID electrodes. A Sr (Formula presented.) RuO (Formula presented.) superconducting microplate was fabricated into the size as small as the SQUID loop using a focused ion beam and directly mounted on the SQUID with precise positioning for high-sensitivity magnetization measurements. In the preliminary magnetization measurements of this device, we observed vortices trapped into the plate and thus the lower critical field. The improved magnetization measurement device developed to exclude undesirable flux intrusion successfully enabled high-sensitivity detection of quantized vortex.",

keywords = "Chiral p-wave superconductor, Mesoscopic superconductor, Quantized vortex, Superconducting quantum interference device",

author = "Y. Nago and T. Shinozaki and S. Tsuchiya and R. Ishiguro and H. Kashiwaya and S. Kashiwaya and S. Nomura and K. Kono and H. Takayanagi and Y. Maeno",

year = "2016",

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doi = "10.1007/s10909-016-1530-z",

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AU - Nago, Y.

AU - Shinozaki, T.

AU - Tsuchiya, S.

AU - Ishiguro, R.

AU - Kashiwaya, H.

AU - Kashiwaya, S.

AU - Nomura, S.

AU - Kono, K.

AU - Takayanagi, H.

AU - Maeno, Y.

PY - 2016/5/1

Y1 - 2016/5/1

N2 - We developed high-sensitivity magnetization measurement devices composed of micro-dc-SQUIDs and a superconducting Sr (Formula presented.) RuO (Formula presented.) microplate, aiming to investigate novel magnetic properties related to a spin-triplet chiral p-wave superconductor with a mesoscopic size. Micron-sized dc-SQUID was fabricated by thin Al electrodes, and the SQUID structure was improved to prevent magnetic fluxes from intruding into SQUID electrodes. A Sr (Formula presented.) RuO (Formula presented.) superconducting microplate was fabricated into the size as small as the SQUID loop using a focused ion beam and directly mounted on the SQUID with precise positioning for high-sensitivity magnetization measurements. In the preliminary magnetization measurements of this device, we observed vortices trapped into the plate and thus the lower critical field. The improved magnetization measurement device developed to exclude undesirable flux intrusion successfully enabled high-sensitivity detection of quantized vortex.

AB - We developed high-sensitivity magnetization measurement devices composed of micro-dc-SQUIDs and a superconducting Sr (Formula presented.) RuO (Formula presented.) microplate, aiming to investigate novel magnetic properties related to a spin-triplet chiral p-wave superconductor with a mesoscopic size. Micron-sized dc-SQUID was fabricated by thin Al electrodes, and the SQUID structure was improved to prevent magnetic fluxes from intruding into SQUID electrodes. A Sr (Formula presented.) RuO (Formula presented.) superconducting microplate was fabricated into the size as small as the SQUID loop using a focused ion beam and directly mounted on the SQUID with precise positioning for high-sensitivity magnetization measurements. In the preliminary magnetization measurements of this device, we observed vortices trapped into the plate and thus the lower critical field. The improved magnetization measurement device developed to exclude undesirable flux intrusion successfully enabled high-sensitivity detection of quantized vortex.

KW - Chiral p-wave superconductor

KW - Mesoscopic superconductor

KW - Quantized vortex

KW - Superconducting quantum interference device

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