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SUMMARY:Artificial Ferroic Systems
DTSTART:20160229T131500
DTEND:20160229T141500
DTSTAMP:20260407T181244Z
UID:04f72785418864c86259443b8122eddf0d1234378915e528313d84c9
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Laura Heyderman
\, ETH Zürich – Paul Scherrer Insti
 tute\nIn artificial ferroic systems\, through the combination of patterned
  ferroic materials and the control of the interactions between the differe
 nt components\, novel functionality can be engineered that is interesting 
 for a wide variety of applications including data storage and transfer\, m
 emory\, sensors and high frequency communications. I will present two clas
 ses of these systems\, beginning with hybrid mesoscopic structures incorpo
 rating two different ferromagnetic layers whose static and dynamic behavio
 ur result from the mutual imprint of the magnetic domain configurations. H
 ere we have demonstrated a new mechanism for control of the magnetisation 
 at the sub-20 nm scale [1]\, so providing a local magnetic switch.\nI will
  then describe our progress on artificial spin ice\, consisting of arrays 
 of dipolar-coupled nanomagnets arranged in frustrated geometries. We have 
 used synchrotron x-ray photoemission electron microscopy to observe the be
 haviour of emergent magnetic monopoles in an array of nanomagnets placed o
 n the kagome lattice [2]. We have also created artificial spin ice with th
 ermally fluctuating magnetic moments and observed the evolution of magneti
 c configurations with time. This has provided a means to study relaxation 
 processes with a controlled route to the lowest-energy state [3] and we ha
 ve also demonstrated with muon spin relaxation that these magnetic metamat
 erials can support thermodynamic phase transitions [4]. Future directions 
 include the incorporation of novel magnetic materials\, the investigation 
 of 3D structures [8]\, as well as the implementation of synchrotron x-ray 
 resonant magnetic scattering to study magnetic correlations in arrays of s
 maller nanomagnets at faster timescales.\n[1] P. Wohlhuter et al.\, Nature
  Communications 6\, 7836 (2015)\n[2] E. Mengotti et al.\, Nature Physics 7
 \, 68 (2011)\n[3] A. Farhan et al.\, Nature Physics 9\, 375  (2013)\n[4] 
 L. Anghinolfi et al.\, Nature Communications 6\, 8278 (2015)\n[5] C. Donne
 lly et al.\, Physical Review Letters 114\, 115501 (2015)\nBio: Laura Heyde
 rman began her career in magnetism in 1988\, working as a Bristol Universi
 ty PhD student at the CNRS\, Paris on magnetic multilayers. As a postdoc u
 sing electron microscopy at Glasgow University\, she worked on a variety o
 f magnetic materials. She then spent four years working in industry in the
  UK and since 1999\, she has been based at the Laboratory for Micro- and N
 anotechnology\, Paul Scherrer Institute. In January 2013\, she became Prof
 essor of Mesoscopic Systems at the Department of Materials\, ETH Zurich.\n
 Professor Heyderman has over 137 scientific publications\, most recently i
 n the field of magnetic nanostructures. Her work on artificial ferroic sys
 tems has led to several invited and plenary talks\, as well as articles in
  the German and French equivalents to Scientific American. She is Membersh
 ip Chair as well as member of the Nomination and Advisory Committees of th
 e IEEE Magnetics Society. She has been a program and advisory committee me
 mber of several international conferences on magnetism and was program cha
 ir of the Micro- and Nanoengineering Conference (MNE) 2014 held at the EPF
 L campus. She is a Fellow of the Institute of Physics and held the Wohlfar
 th Prize Lecture at Magnetism 2015\, the UK magnetism meeting run by the I
 nstitute of Physics & IEEE Magnetics Society\, and has been awarded a Bell
 er Lectureship for the American Physical Society Meeting in March 2016.
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CONFIRMED
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