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SUMMARY:Elastic and Magnetic properties of Tb-MnO based Thin Films
DTSTART;VALUE=DATE-TIME:20210726T100000Z
DTEND;VALUE=DATE-TIME:20210726T101500Z
DTSTAMP;VALUE=DATE-TIME:20260813T214007Z
UID:indico-contribution-7093@events.saip.org.za
DESCRIPTION:Speakers: Geoffrey Mwendwa (School of Physics\, Material Physi
 cs Research Institute\, University of the Witwatersrand\, Private Bag 3\, 
 2050\, South Africa)\nMultiferroic rare-earth composites in thin-film form
 at have shown promising results towards the attainment of strong coupling 
 of ferroic orders (ferroelasticity\, ferromagnetism\, ferroelectricity\, a
 nd ferrotoroidicity) at room temperature\, which is a key parameter to the
  realization of low-energy dissipating devices such as solid-state refrige
 rators\, spintronic memory storage\, etc. In this work\, we have synthesiz
 ed Tb-MnO based thin films on (001) Si at ambient temperature using radio 
 frequency magnetron (RF) sputtering at 50 W and investigated their elastic
  and magnetic properties. The elastic properties of the films have been me
 asured by surface Brillouin scattering (SBS) at ambient temperature\, opti
 mized\, and fitted with data simulated using surface Elastodynamic Green
 ’s function for discrete phonon dispersion in the k//d range of 0–5. B
 y least-squares fitting approach\, the measurement uncertainties have been
  obtained from the Taylor series expansion of the phonon phase velocity de
 pendence on the primary elastic constants (C11 and C44)\, yielding the opt
 imum values as\; C11 = 180 +/- 4.90 GPa and C44 = 43 +/- 0.89 GPa. On the 
 other hand\, the magnetic properties of the films have been studied by vib
 rating sample magnetometry (VSM). The films have been noted to attain ferr
 omagnetic ordering at T<150 K. Spin-glass-like behaviour associated with c
 ompeting ferromagnetic and antiferromagnetic magnetic ordering has also be
 en observed at T~50 K.\n\nKeywords: Multiferroics\, thin-film\, elastic co
 nstants\, ferromagnetism\, spin-glass\n\nhttps://events.saip.org.za/event/
 206/contributions/7093/
LOCATION:North-West University Potchefstroom Campus
URL:https://events.saip.org.za/event/206/contributions/7093/
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