| Fundamentals of Magnetism and Magnetic Measurements by Mike McElfresh, Purdue University, featuring Quantum Design's Magnetic Property Measurement System (MPMS®) | |
click to download |
| The
booklet provides a primer on magnetic units of measure and many types
of magnetic behavior, as well as an overview of the MPMS® and the principles
on which it is based. It is a practical introduction to professionals
across a wide range of disciplines who are involved with the sophisticated
examination of matter. This document was written in the hope of shortening
the learning curve for those developing the techniques required to
make meaningful measurements of magnetic phenomena. |
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| Effects of Magnetic Field Uniformity on the Measurement of Superconducting Samples by Mike McElfresh and Shi Li of Purdue University and Ron Sager of Quantum Design | click
to download this booklet (.pdf): |
|
| Abstract:
Since the discovery of the high-temperature superconductors, much
has been learned about strong-pinning effects of magnetic flux in
superconducting materials. These materials can display extreme hysteresis,
and measurements on them can be affected dramatically if the magnetic
history of the sample is altered or if the sample experiences even
small variations in magnetic field during the measurement. As a result,
during the last several years a variety of unexpected and unexplained
phenomena have been reported for these materials.
This study presents
a systematic analysis that describes some of the effects magnetic
field non-uniformity can produce when making magnetic measurements
on superconducting materials. Most of the results of this study
are generally applicable to any magnetometer system in which the
sample is moved (or the field is changed) during the measurement.
Our goal in performing this work has been to help the users of many
different magnetometers understand more fully some of the anomalous
behaviors that have been reported over the last several years. |
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