TY  - CONF
AU  - Hutanu, Vladimir
AU  - Sazonov, Andrew
AU  - Roth
AU  - Murakawa
AU  - Tokura
AU  - Bordacs
AU  - Kezsmarki
AU  - Nafradi
AU  - Braden
AU  - Stein
AU  - Baum
AU  - Oh,
TI  - Spherical neutron polarimetry in multiferroics under external stimuli
VL  - A70
SN  - 0108-7673
CY  - Oxford [u.a.]
PB  - Blackwell
M1  - FZJ-2017-08091
SP  - C151
PY  - 2014
AB  - Study  of  multiferroics,  materials  simultaneously  having  more  than  one  primary  ferroic  order  parameter,  is  a  hot  topic  of  mate rial sciences. The most extensively studied class of these compounds is the family of magnetoelectric multiferroics, where ferroelectricity can  be  induced  by  various  types  of  magnetic  orderings  via  the  relativistic  spin-orbit  interaction.  As  a  consequence  of  the  cross coupling  between  spins  and  electric  polarization,  the  spectacular  control  of  the  ferroelectric  polarization  by  external  magnetic  field and the manipulation of the magnetic order via electric field can often be realized in these systems. Depending on the symmet ry and microscopic   mechanism   of   the   multiferroicity   the   coupling   energy   between   magnetic   and   electric   ordering   parameters   can significantly  vary.  Classical  neutron  diffraction  often  fails  in  the  precise  determining  of  the  complex  magnetic  structure  in   the multiferroics  due  to  the  presence  of  the  statistically  distributed  domains  in  the  macroscopic  sample.  Using  spherical  neutron polarimetry  (SNP),  known  also  as  3D  polarization  analysis,  it  is  possible  not  only  to  precisely  determine  the  complex  magnetic structure,  but  also  to  investigate  in-situ  its  evolution  with  external  parameters  and  to  control  the  magnetic  domains  distribution under the influence of the external electric or/and magnetic field. Here we will present some SNP results on few different mu ltiferroic materials.  In  some  of  them,  e.g.  square  lattice  2D  antiferromagnet  Ba2CoGe2O7,  even  strong  electric  field  does  not  change  the magnetic order. However rater week magnetic field is sufficient to create a mono-domain structure and to rotate spins in the plane. In other e.g. incommensurate (spiral) magnetic structure  of the TbMnO3, solely electric field is sufficient to fully control the chirality of the magnetic structure. In the case of Cr2O3 both electric and magnetic fields should be applied in parallel in order to switch between the different antiferromagnetic domains.
T2  - Twenty-Third Congress and General Assembly of the International Union of Crystallography
CY  - 5 Aug 2014 - 12 Aug 2014, Montreal (Canada)
Y2  - 5 Aug 2014 - 12 Aug 2014
M2  - Montreal, Canada
LB  - PUB:(DE-HGF)8
UR  - https://juser.fz-juelich.de/record/840586
ER  -