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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Thin Film Physics

Background:

  • Bulk LaCoO3 (LCO) is paramagnetic, but ferromagnetism (FM) appears in strained thin films.
  • The origin of this interfacial FM in LCO remains unexplained.

Purpose of the Study:

  • Investigate the atomic density and magnetization distribution in strained LCO films.
  • Elucidate the mechanisms behind low-temperature ferromagnetism in LCO thin films.

Main Methods:

  • Quantitative measurement of atomic density and magnetization using polarized neutron reflectometry (PNR).
  • Systematic application of hydrostatic pressure during PNR experiments.

Main Results:

  • LCO layers near heterointerfaces show reduced magnetization and enhanced atomic density.
  • The film's interior exhibits the opposite trend, indicating nonuniformity.
  • Magnetization is controllable via hydrostatic pressure at -20.4% per GPa.

Conclusions:

  • Interface symmetry mismatch induces structural distortion and ferroelasticity, driving FM.
  • Tunable deformation of CoO6 octahedra, coupled with ferroelasticity, controls FM in strained LCO films.