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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-8959
DTSTART:20241121T160000Z
DURATION:PT1H0M0S
DTSTAMP:20260413T170647Z
LAST-MODIFIED:20241016T201231Z
LOCATION:5310 Chamberlin
SUMMARY:Pressure and Strain Control of Multiferroic Order in NiI2\, R.
  G. Herb Condensed Matter Seminar\, Shua Sanchez\, MIT
DESCRIPTION:Multiferroic materials exhibit a linear coupling between s
 imultaneous magnetic and<br>\nferroelectric orders\, a rare and unexpe
 cted phenomenon. These intriguing materials have attracted<br>\ngreat 
 interest as a platform for energy-efficient computing by using electri
 c fields to control magnetic<br>\nstates. The van der Waals material N
 iI2 has been identified as the first multiferroic material in the 2D<b
 r>\nlimit. Here\, a magnetic spin spiral forms between Ni atoms\, whic
 h breaks inversion symmetry and<br>\ninduces a ferroelectric polarizat
 ion. These electronic orders also break the rotational symmetry of the
 <br>\nlattice\, enabling structural tuning parameters to directly coup
 le to them. In this talk\, I will discuss<br>\npressure and strain tun
 ing measurements of NiI2 which demonstrate the high degree of tunabili
 ty of<br>\nthis system\, as characterized by x-ray\, Raman\, and polar
 imetry measurements. We observe that<br>\ntransition temperatures can 
 be strongly enhanced by pressure. Further\, strain-tuning is shown to 
 control<br>\nthe polarization direction of the electronic orders. Thes
 e results present a path forward for structural<br>\ncustom tuning of 
 multiferroics to realize the goal of ultrafast state switching.
URL:https://www.physics.wisc.edu/events/?id=8959
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