Presentation Information
[P1-54]Pulsed Field Magnetometers - validating data generated by Self-Demagnetisation Field Function (SDFF) correction to create closed loop results from open loop measurements
*Robin Cornelius1, Jian He2, Jack Wade1, Stuart Harwin1, James Mckenzie1 (1. Hirst Magnetic Instruments Ltd (UK), 2. National Institute of Metrology (China))
Keywords:
BH loops,Pulsed Field Magnetometer,Rare Earth Permanent Magnet Characterisation
The Hirst PFM08 range of magnet characterisation magnetometer launched in 2023 can rapidly and accurately measure the magnetic hysteresis loop and extract key values for all high-grade permanent magnetic materials such as NdFeB, SmCo, Ferrite and all coated magnets. With a maximum field of 10.5T (8356 kA/m / 105 kOe) even the most coercive materials and highest grades of NdFeB or SmCo can be measured, while traditional permeameters cannot measure these high coercivity materials due to pole piece saturation limitations. The 8thgeneration of PFMs from Hirst feature the eddy current correction (patented F-2F algorithm), Self-Demagnetisation Field (SDF) correction function (to allow accurate measurement of a wide range of samples from cylinders, cuboids and arbitrary sample shapes), and Hirst proprietary Self De-magnetisation Field Function SDFF TM (patented) which accurately generates an open to closed circuit mapping. SDFF technology has been implemented in collaboration with the National Institute of Metrology (NIM), Beijing, as part of a contract for the first 8th generation PFM placed by NIM in 2023. This paper will present the detailed results that validate the SDFF algorithm validating the claim that the results are within 1% of NIM permeameter reference measurements on standard reference samples
