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SUMMARY:Hunting for Hidden Order - Nicola Spaldin (ETH Zurich)
DTSTART:20251015T151500Z
DTEND:20251015T161500Z
UID:TALK235600@talks.cam.ac.uk
CONTACT:Andrea Pizzi
DESCRIPTION:Most magnetic materials\, phenomena and devices are well descr
 ibed in terms of the magnetic dipoles arising from the spin of their const
 ituent electrons. There is mounting evidence\, however\, of intriguing mag
 netic behaviors that can't be explained in terms of electron spin dipole m
 oments\; these behaviors are often attributed to "hidden order" since thei
 r origin is difficult to decipher with conventional experimental probes. I
 n this talk I will discuss some unusual magnetic effects\, such as electri
 c-field induced magnetism\, magnetism on apparently non-magnetic surfaces\
 , and unconventional spin splitting of energy bands\, and show that they c
 an be understood in terms of a "hidden order" of higher-order magnetic mul
 tipoles\, beyond the magnetic dipole. While there are clear experimental s
 ignatures of such hidden multipolar order\, and it is captured nicely in o
 ur computer simulations\, attempts at direct measurement have so far prove
 d elusive\, and I will close with a plea for better ideas.\n\n_If you wish
  to meet the speaker\, please contact ap2076@cam.ac.uk to be added to thei
 r visit schedule._
LOCATION:Cluster Seminar Room\, Ray Dolby Centre
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