Fully automated measurement of anisotropy of magnetic susceptibility using 3D rotator

A 3D rotator (for MFK1-FA or MFK1-A Kappabridges) was developed to increase the speed and comfort of anisotropy of magnetic susceptibility (AMS) measurements. The 3D rotator rotates the specimen simultaneously about two axes with different velocities. The two-axis rotation enables the determination of 320 directional susceptibilities during a single anisotropy measurement. These directions are very well distributed on a sphere which makes the measuring design almost rotatable. The actual measurement is fully automated in such a way that, once the specimen is mounted into the rotator, it requires no additional manipulation to measure the full AMS tensor. The approximate duration of one anisotropy measurement is 1.5 min. Fundamental ideas of data acquisition and processing, AMS tensor fitting and respective error analysis are described and discussed. Calculation of the anisotropy tensor, respective error analysis and immediate data visualization is provided by Safyr5 software. Examples comparing the 3D rotator data with previously developed systems of AMS determination are presented.