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SUMMARY:Two-Dimensional Magnets (Busse)
DTSTART:20260709T140000Z
DTEND:20260709T150000Z
DTSTAMP:20260713T012500Z
UID:indico-event-897@indico.physik.uni-siegen.de
DESCRIPTION:Speakers: Thomas Michely\n\nII. Physikalisches Institut\, Univ
 ersität zu Köln\, Zülpicher Straße 77\, 50937 Köln\, Germany\n \nTwo
 -dimensional (2D) magnets consist of a single or a few layers of ultimatel
 y thin magnetically ordered materials\, of which the layers are separated 
 by van der Waals gaps. Their discovery in 2017 came with a bit of surprise
 \, since the Mermin-Wagner theorem seemed to prohibit their existence. Cur
 rent research on 2D magnets is intense\, as they are not only just a new c
 lass of magnets\, but offer new physics since their magnetic state can be 
 tuned by electric fields\, light\, or strain. 2D antiferromagnets are espe
 cially interesting\, since antiferromagnets offer up to 1000 times faster 
 switching compared to ferromagnets and lack a stray field. They provide a 
 perspective of ultimate miniaturization in spintronics. After an introduct
 ion to the topic\, this talk will show how 2D magnetscan be created that c
 annot be derived from a bulk crystal. For two of these 2D antiferromagnets
 \, Cr2S3-2D and h-Fe2S2\, it will be shown how the switching of 2D antifer
 romagnets can be detected\, how the magnetic properties can be tuned by an
  electric field\, and how the spin structure of such materials can be unco
 vered down to the atomic scale. This is accomplished by spin-polarized sca
 nning tunneling microscopy in combination with x-ray circular magnetic dic
 hroism and density functional theory calculations.\n\nhttps://indico.physi
 k.uni-siegen.de/event/897/
URL:https://indico.physik.uni-siegen.de/event/897/
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