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SUMMARY:Controlling materials at the nanoscale with ion migration
DTSTART:20170303T083000
DTEND:20170303T093000
DTSTAMP:20260511T050443Z
UID:e0880aa69a658bc2e618f3671ebe93d2d0604404221c8e7c330d269b
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Dustin Gilbert\, National Institute of Standards and Techno
 logy\, Gaithersburg USA\nIonic crystals play a crucial role in nearly ever
 y field of material science\, ranging from well-established functional mat
 erials to highly exotic\, cutting-edge research materials. In ionic crysta
 ls\, bonding between the (inter)metallic atoms and ions\, such as oxygen o
 r nitrogen\, gives rise to interactions which then manifest new and intere
 sting behaviors. Control over the ion distribution thus provides a powerfu
 l mechanism to tune the properties of these materials at an atomic level. 
 Furthermore\, the very nature of ionic crystals - with net charges on the 
 constituent atoms - unlocks the potential for electric field control\, and
  thus is attractive for low-power device applications. In this talk\, I wi
 ll introduce the emerging field of magneto-ionics\, in which the magnetic 
 properties of materials are tuned by controlling the ionic distributions u
 sing both electric field and chemical control mechanisms. Highlighted in t
 his work\, I demonstrate control over magnetic interfaces [1] and magnetic
  films with bulk-like properties [2]. I then show that\, in similar system
 s\, the magnetism can be directly controlled using electric fields through
  the magneto-ionic effect [3]. Neutron scattering and x-ray spectroscopy a
 re demonstrated as optimal tools for probing the oxygen migration and the 
 unexpected magnetic ramifications. These works together present significan
 t opportunities for a new class of device technologies.\n\n[1] Gilbert et 
 al.\, Nature Commun. 7\, 11050 (2016).\n[2] Grutter et al.\, Appl. Phys. L
 ett. 108\, 082405 (2016).\n[3] Gilbert et al.\, Nature Commun. 7\, 12264 (
 2016).\n\nBio:\nDustin Gilbert is a research physicist at the United State
 s' National Institute of Standards and Technology. He received his B.S. fr
 om the University of California at Santa Cruz in Physics\, and an M.S. and
  Ph.D. from the University of California at Davis\, also in Physics. He ha
 s been active in the area of nanoscale materials with an emphasis on magne
 tism\, including high-anisotropy materials\, patterned nanostructures\, ch
 iral spin textures\, and interface coupled composites. His current researc
 h has leveraged the unique capabilities of neutron scattering and synchrot
 ron X-rays together to advance the understanding of new emergent fields\, 
 including magneto-ionics\, skyrmions\, and topological insulators.\n\n\n 
LOCATION:MED 2 1124 (Coviz2) http://plan.epfl.ch/?lang=fr&room=MED21124
STATUS:CONFIRMED
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