Development of Metallic Magnetic Calorimeters with a Critical Temperature Switch

S. R. Kim; J. Choi; H. S. Jo; C. S. Kang; G. B. Kim; H. L. Kim; I. W. Kim; H. J. Lee; J. H. Lee; M. K. Lee; S. Y. Oh; E. Sala; J. H. So; W. S. Yoon; Y. H. Kim

doi:10.1007/s10909-016-1479-y

Development of Metallic Magnetic Calorimeters with a Critical Temperature Switch

S. R. Kim, J. Choi, H. S. Jo, C. S. Kang, G. B. Kim, H. L. Kim, I. W. Kim, H. J. Lee, J. H. Lee, M. K. Lee, S. Y. Oh, E. Sala, J. H. So, W. S. Yoon, Y. H. Kim

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3 Scopus citations

Abstract

We report on the progress in the development of meander-shaped metallic magnetic calorimeters (MMCs) with a critical temperature switch. A niobium meander-shaped coil in an MMC is arranged to form a superconducting loop. It is to measure the change in magnetization and to apply a persistent current that magnetizes the MMC sensor material. In this work, part of the superconducting loop is fabricated with another superconducting material with its transition temperature (T_C) lower than that of niobium. A persistent current can be injected in the loop while reducing the temperature from above to below the T_C of the switch. Aluminum (Al) wires and an alloy of molybdenum and germanium (MoGe) were tested as critical temperature switch. The test with the Al switch demonstrated the temperature switch concept for meander-shaped MMCs that require a large field current. Microfabricated MoGe switches showed a T_C near 4.3 K, but only 7 mA of persistent current could be charged due to MoGe film discontinuity. This issue requires further improvement in the fabrication procedure.

Original language	English
Pages (from-to)	356-362
Number of pages	7
Journal	Journal of Low Temperature Physics
Volume	184
Issue number	1-2
DOIs	https://doi.org/10.1007/s10909-016-1479-y
State	Published - 1 Jul 2016

Keywords

Johnson noise
Metallic magnetic calorimeter
Persistent current

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title = "Development of Metallic Magnetic Calorimeters with a Critical Temperature Switch",

abstract = "We report on the progress in the development of meander-shaped metallic magnetic calorimeters (MMCs) with a critical temperature switch. A niobium meander-shaped coil in an MMC is arranged to form a superconducting loop. It is to measure the change in magnetization and to apply a persistent current that magnetizes the MMC sensor material. In this work, part of the superconducting loop is fabricated with another superconducting material with its transition temperature (TC) lower than that of niobium. A persistent current can be injected in the loop while reducing the temperature from above to below the TC of the switch. Aluminum (Al) wires and an alloy of molybdenum and germanium (MoGe) were tested as critical temperature switch. The test with the Al switch demonstrated the temperature switch concept for meander-shaped MMCs that require a large field current. Microfabricated MoGe switches showed a TC near 4.3 K, but only 7 mA of persistent current could be charged due to MoGe film discontinuity. This issue requires further improvement in the fabrication procedure.",

keywords = "Johnson noise, Metallic magnetic calorimeter, Persistent current",

author = "Kim, {S. R.} and J. Choi and Jo, {H. S.} and Kang, {C. S.} and Kim, {G. B.} and Kim, {H. L.} and Kim, {I. W.} and Lee, {H. J.} and Lee, {J. H.} and Lee, {M. K.} and Oh, {S. Y.} and E. Sala and So, {J. H.} and Yoon, {W. S.} and Kim, {Y. H.}",

note = "Publisher Copyright: {\textcopyright} 2016, Springer Science+Business Media New York.",

year = "2016",

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doi = "10.1007/s10909-016-1479-y",

language = "English",

volume = "184",

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AU - Kim, S. R.

AU - Choi, J.

AU - Jo, H. S.

AU - Kang, C. S.

AU - Kim, G. B.

AU - Kim, H. L.

AU - Kim, I. W.

AU - Lee, H. J.

AU - Lee, J. H.

AU - Lee, M. K.

AU - Oh, S. Y.

AU - Sala, E.

AU - So, J. H.

AU - Yoon, W. S.

AU - Kim, Y. H.

PY - 2016/7/1

Y1 - 2016/7/1

N2 - We report on the progress in the development of meander-shaped metallic magnetic calorimeters (MMCs) with a critical temperature switch. A niobium meander-shaped coil in an MMC is arranged to form a superconducting loop. It is to measure the change in magnetization and to apply a persistent current that magnetizes the MMC sensor material. In this work, part of the superconducting loop is fabricated with another superconducting material with its transition temperature (TC) lower than that of niobium. A persistent current can be injected in the loop while reducing the temperature from above to below the TC of the switch. Aluminum (Al) wires and an alloy of molybdenum and germanium (MoGe) were tested as critical temperature switch. The test with the Al switch demonstrated the temperature switch concept for meander-shaped MMCs that require a large field current. Microfabricated MoGe switches showed a TC near 4.3 K, but only 7 mA of persistent current could be charged due to MoGe film discontinuity. This issue requires further improvement in the fabrication procedure.

AB - We report on the progress in the development of meander-shaped metallic magnetic calorimeters (MMCs) with a critical temperature switch. A niobium meander-shaped coil in an MMC is arranged to form a superconducting loop. It is to measure the change in magnetization and to apply a persistent current that magnetizes the MMC sensor material. In this work, part of the superconducting loop is fabricated with another superconducting material with its transition temperature (TC) lower than that of niobium. A persistent current can be injected in the loop while reducing the temperature from above to below the TC of the switch. Aluminum (Al) wires and an alloy of molybdenum and germanium (MoGe) were tested as critical temperature switch. The test with the Al switch demonstrated the temperature switch concept for meander-shaped MMCs that require a large field current. Microfabricated MoGe switches showed a TC near 4.3 K, but only 7 mA of persistent current could be charged due to MoGe film discontinuity. This issue requires further improvement in the fabrication procedure.

KW - Johnson noise

KW - Metallic magnetic calorimeter

KW - Persistent current

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ER -

Development of Metallic Magnetic Calorimeters with a Critical Temperature Switch

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Keywords

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