Utilizing Materials With Controllable Curie Temperatures for Magnetic Actuation Purposes

Dan Eriksen, Christian R.H. Bahl, Anders Smith, Nini Pryds

Research output: Contribution to journalJournal articleResearchpeer-review


The magnetic force between a permanent magnet and different blocks of ferromagnetic materials was measured and calculated as a function of distance and temperature in the vicinity of the Curie temperature of the materials. The calculations were carried out using a 3-D finite-element model of the system. On the basis of forces predicted by the model a number of equilibrium points were calculated for a system where the magnetic force on a ferromagnetic block of material is balanced by a linear spring force. It is shown how these calculation procedures can be used as a tool for designing autonomous temperature dependent and temperature adjustable actuation systems. A shunt valve utilizing such a system was designed, built and tested.
Original languageEnglish
JournalI E E E Transactions on Magnetics
Issue number3
Pages (from-to)1159-1162
Publication statusPublished - 2013


  • Magnetic forces
  • Magnetic materials
  • Permanent magnet (PM) machines

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