Application of a dc SQUID to rf amplification: NQR

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Superconducting QUantum Interference Devices (SQUIDs) have been used for more than a decade for the detection of magnetic resonance. Until recently, these devices had mostly been confined to operation in the audiofrequency range, so that experiments have been restricted to measurements of resonance at low frequencies, or of changes in the static susceptibility of a sample induced by rf irradiation at the resonant frequency. However, the recent extension of the operating range of low noise dc SQUIDs to radiofrequencies (rf) allows one to detect magnetic resonance directly at frequencies up to several hundred megahertz. In this paper, we begin by ... continued below

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Pages: 13

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Hilbert, C.; Clarke, J.; Sleator, T. & Hahn, E.L. May 1, 1985.

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Description

Superconducting QUantum Interference Devices (SQUIDs) have been used for more than a decade for the detection of magnetic resonance. Until recently, these devices had mostly been confined to operation in the audiofrequency range, so that experiments have been restricted to measurements of resonance at low frequencies, or of changes in the static susceptibility of a sample induced by rf irradiation at the resonant frequency. However, the recent extension of the operating range of low noise dc SQUIDs to radiofrequencies (rf) allows one to detect magnetic resonance directly at frequencies up to several hundred megahertz. In this paper, we begin by summarizing the properties of dc SQUIDs as tuned rf amplifers. We then describe first, the development of a SQUID system for the detection of pulsed nuclear quadrupole resonance (NQR) at about 30 MHz and second, a novel technique for observing magnetic resonances in the absence of any externally applied rf fields.

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Pages: 13

Notes

NTIS, PC A02/MF A01; 1.

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  • 3. international conference on superconducting quantum devices, Berlin, F.R. Germany, 25 Jun 1985

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  • Other: DE86001986
  • Report No.: LBL-19653
  • Report No.: CONF-8506203-1
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 5083232
  • Archival Resource Key: ark:/67531/metadc1061649

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • May 1, 1985

Added to The UNT Digital Library

  • Jan. 22, 2018, 7:23 a.m.

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  • Jan. 29, 2018, 12:49 p.m.

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Hilbert, C.; Clarke, J.; Sleator, T. & Hahn, E.L. Application of a dc SQUID to rf amplification: NQR, article, May 1, 1985; United States. (digital.library.unt.edu/ark:/67531/metadc1061649/: accessed May 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.