Demagnetization Curves

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 CodeCategoryManufacturer            Grade
AMNeodymium MagnetsArnold Magnetics           N40UH
AMNeodymium MagnetsHitachi Metals                NMX-48BH
BMSamarium Cobalt MagnetsDexter Magnetics           S3218
BMSamarium Cobalt MagnetsElectron Energy Corp    20-T500
CMBonded Molded MagnetsBMG                              2560
CMBonded Molded MagnetsKolektor                         86EP
DMFerrite MagnetsDexter Magnetics          HF085
DMFerrite MagnetsTDK                              FB138
EMAlnico MagnetsHPMG                           LNGT18
EMAlnico MagnetsThomas & Skinner        Alnico 9