On the feasibility of “measuring” crystal field parameters in a rotating-sample magnetometer

Kuz’min, M. D.
April 2004
Applied Physics Letters;4/5/2004, Vol. 84 Issue 14, p2605
Academic Journal
It is argued that the crystal field parameters (CFPs) of rare-earth magnets can be determined by means of a rotating-sample magnetometer (RSM), recording the harmonics of magnetization Mn, n=2,4,6, in a constant magnetic field, as temperature varies. The process of “measuring” individual CFP of order n can be as direct as observing the slope of the Mn-vs-T-n dependence at sufficiently high temperatures, necessarily in the paramagnetic region. Although the basic idea of the RSM is anything but new, its implementation is greatly facilitated by the recent technological developments, such as digital lock-in amplifiers, miniature stepper motors, and high-performance permanent magnets. © 2004 American Institute of Physics.


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