Magnetic Collapse? - probing the limits of magnetism under pressure
| Date/Time: | Thursday, 12 Oct 2017 from 4:10 pm to 5:00 pm |
|---|---|
| Location: | Physics 003 |
| Phone: | 515-294-7377 |
| Channel: | College of Liberal Arts and Sciences |
| Actions: | Download iCal/vCal | Email Reminder |
Magnetism in condensed-matter systems drives myriad
technological possibilities: from navigation to motors to digital
memory. With such important implications, theoretical treatments
predicting or describing magnetism have long been pursued. A basic
prediction of many magnetic models is that high pressures (of order 1
Mbar, 1 million times atmospheric pressure) should act to collapse the
magnetism, rendering something like iron as magnetically innocuous as
copper. Therefore, a valuable test-bed for many theoretical models
involves interrogating magnetism under pressure. While theoretical tools
can generally (and sometimes easily!) perturb a system with applied
pressure, the experimental tools to generate pressure and interrogate
magnetism are not as straightforward, and certainly not trivial. In this
presentation, I will discuss a few magnetic systems that we have
explored, and describe the tools we have used to examine their magnetism
under pressure. In some cases, magnetism is extremely robust with
pressure, whereas other forms of magnetism are more strongly suppressed
with pressure. Understanding the confines of magnetism in pressure-space
should help to improve theoretical descriptions of magnetism.