Development of a superconducting magnet for nuclear magnetic resonance using bulk high-temperature superconducting materials

Takashi Nakamura, Yoshitaka Itoh, Masaaki Yoshikawa, Tetsuo Oka, Jun Uzawa

Research output: Contribution to journalArticle

65 Citations (Scopus)


We developed a trapped-field magnet system using a bulk high-temperature superconducting (HTS) material (Sm-Ba-Cu-O; abbreviated as Sm123) and used it to observe a signal of 1H nuclear magnetic resonance (NMR). The compact magnet system can fit on a table and needs no conventional refrigerant such as liquid helium. The magnet has a c-axis-oriented single-domain Sm123 bulk superconductor containing 20 wt.% Ag and was synthesized in the melt-textured process. The magnet is constructed of two cylindrical pieces, 36-mm outer and 7-mm inner diameters, respectively, and 16-mm thickness. This configuration results in magnetic field stability and suitable homogeneity for observation of NMR signal. The magnet was magnetized to 3 T by an ordinary NMR superconducting magnet by using a field cooling (FC) method. The bulk magnet was magnetized at 60K and has been kept at the temperature under 58K by using a pulse tube refrigerator. We observed 1H NMR signal from the silicon rubber with the size of 1.2 mm diameter and 1.5 mm length at 2.89 Tesla (123 MHz) and 228 kHz peak width.

Original languageEnglish
Pages (from-to)65-70
Number of pages6
JournalConcepts in Magnetic Resonance Part B: Magnetic Resonance Engineering
Issue number2
Publication statusPublished - 2007 Apr 1



  • Bulk HTS
  • HTS
  • High temperature superconductor
  • Magnet
  • Superconducting magnet

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging
  • Spectroscopy
  • Physical and Theoretical Chemistry

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