There are three important considerations when selecting a magnetometry measurement technique that is best suited for a material: sensitivity, speed, and temperature or field range over which the measurement will be made. The feature article in the latest issue of Magnetics Business & Technology magazine was written by Lake Shore Senior Scientist Brad Dodrill. In it he compares magnetic material characterization techniques and presents typical electromagnet-based VSM measurement results in regard to these considerations.
One technique that provides more information than a simple hysteresis loop is first order reversal curve, or FORC, measurements. FORCs are acquired by saturating a sample in a field, decreasing the field to a reversal field, and then sweeping the field back to saturation in a series of steps. The process is repeated for many reversal field values, resulting in a series of FORCs. This data can then be analyzed and plotted in 2D or 3D FORC diagrams that provide information regarding magnetic interactions and coercivity distributions.
A typical series of FORC measurements can contain thousands of data points, making the speed of the measurement a critical factor. The Lake Shore 8600 Series VSM has been developed to make extremely fast measurements, hysteresis loops can be recorded in seconds and FORCs in minutes.
The 8600 series also has a moment sensitivity of 25 nemu at room temperature, can generate fields to 3.26 T, and operate over a temperature range of 4.2 K to 1273 K. Along with its redeveloped, ergonomic interface and powerful software features, the 8600 will help you do more science in less time.