184 citations · 451 across the 8 of their papers we have counts for
8 papers
Magnetic levitation by rotation
Joachim Marco Hermansen, Frederik Laust Durhuus, Cathrine Frandsen +3
A permanent magnet can be levitated simply by placing it in the vicinity of another permanent magnet that rotates in the order of 200 Hz. This surprising effect can be easily repro…
Topology optimized permanent magnet systems
R. Bjørk, C. R. H. Bahl, A. R. Insinga
Topology optimization of permanent magnet systems consisting of permanent magnets, high permeability iron and air is presented. An implementation of topology optimization for magne…
The lifetime cost of a magnetic refrigerator
R. Bjørk, C. R. H. Bahl, K. K. Nielsen
The total cost of a 25 W average load magnetic refrigerator using commercial grade Gd is calculated using a numerical model. The price of magnetocaloric material, magnet material a…
Dynamic rotor mode in antiferromagnetic nanoparticles
K. Lefmann, H. Jacobsen, J. Garde +6
We present experimental, numerical, and theoretical evidence for a new mode of antiferromagnetic dynamics in nanoparticles. Elastic neutron scattering experiments on 8 nm particles…
Improving magnet designs with high and low field regions
R. Bjørk, C. R. H. Bahl, A. Smith +1
A general scheme for increasing the difference in magnetic flux density between a high and a low magnetic field region by removing unnecessary magnet material is presented. This is…
Review and comparison of magnet designs for magnetic refrigeration
R. Bjørk, C. R. H. Bahl, A. Smith +1
One of the key issues in magnetic refrigeration is generating the magnetic field that the magnetocaloric material must be subjected to. The magnet constitutes a major part of the e…
Analysis of the magnetic field, force, and torque for two-dimensional Halbach cylinders
R. Bjørk, C. R. H. Bahl, A. Smith +1
The Halbach cylinder is a construction of permanent magnets used in applications such as nuclear magnetic resonance apparatus, accelerator magnets and magnetic cooling devices. In…
Magnetic cooling at Risoe DTU
K. K. Nielsen, R. Bjoerk, J. B. Jensen +5
Magnetic refrigeration at room temperature is of great interest due to a long-term goal of making refrigeration more energy-efficient, less noisy and free of any environmentally ho…