You can download the demagnetization files for the following magnet grades free. Each excel file contains the digital Demagnetization Curves at various temperatures for a specific grade.
MagWeb’s digital demagnetization curves also list the coordinates of the Knee Point of a magnet. Operating a magnet beyond its knee point will demagnetize it, thereby degrading its performance. (Unfortunately, manufacturer’s demagnetization curves do not list this critical knee point data)
Version 2 lists this Knee Point of a grade for each temperature. This knee point is identified by 4 decimals. The data shown in green color refers to data above the knee point. Magnets should always be operated within the green-colored data range to prevent demagnetization. This knee point data aids the fail-safe design of magnets. It is available only at MagWeb.
Table. Demagnetization Curves for Magnets (download link)
|Category Code||Category||Manufacturer Grade|
|AM||Neodymium Magnets||Arnold Magnetics N40UH|
|AM||Neodymium Magnets||Hitachi Metals NMX-48BH|
|BM||Samarium Cobalt Magnets||Dexter Magnetics S3218|
|BM||Samarium Cobalt Magnets||Electron Energy Corp 20-T500|
|CM||Bonded Molded Magnets||BMG 2560|
|CM||Bonded Molded Magnets||Kolektor 86EP|
|DM||Ferrite Magnets||Dexter Magnetics HF085|
|DM||Ferrite Magnets||TDK FB138|
|EM||Alnico Magnets||HPMG LNGT18|
|EM||Alnico Magnets||Thomas & Skinner Alnico 9|