Magnetic Characterization of Soft Magnetic Cores at Cryogenic Temperatures

Xiaoze Pei, Alexander C. Smith, Lode Vandenbossche, Jan Rens

Research output: Contribution to journalArticle

1 Citation (Scopus)
63 Downloads (Pure)


It is important to investigate and understand the magnetic properties of soft magnetic materials at cryogenic temperatures for the optimal design of superconducting machines and superconducting transformers. The magnetic properties of soft magnetic materials at room temperatures have been studied extensively. However, there is almost no information available for the magnetic properties of these materials at cryogenic temperatures. This paper for the first time presents the experimental results for the magnetic characterization of four soft magnetic materials from room temperature down to 21 K. The experimental results demonstrate that the core losses at 21 K is higher than room temperature for all the materials. They also show that the permeability of all the materials reduce at 21 K compared to room temperature. The optimal temperature in terms of the best magnetic properties is identified for each material. The data presented in this paper will provide valuable guidance for practical design and optimization of superconducting machines and superconducting transformers with soft magnetic cores.

Original languageEnglish
Article number8651370
JournalIEEE Transactions on Applied Superconductivity
Issue number5
Early online date25 Feb 2019
Publication statusPublished - 1 Aug 2019


  • core loss
  • Cryogenics
  • magnetic characterization
  • permeability
  • soft magnetic material
  • superconducting machine
  • superconducting transformer

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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