The elevated Curie temperature and half-metallicity in the ferromagnetic semiconductor La$_{x}$Eu$_{1-x}$O

Here we study the effect of La doping in EuO thin films using SQUID magnetometry, muon spin rotation ( $μ$ SR), polarized neutron reflectivity (PNR), and density functional theory (DFT). The $μ$ SR data shows that the La $_{0.15}$ Eu $_{0.85}$ O is homogeneously magnetically ordered up to its elevated $T_{C}$ . It is concluded that bound magnetic polaron behavior does not explain the increase in $T_{C}$ and an RKKY-like interaction is consistent with the $μ$ SR data. The estimation of the magnetic moment by DFT simulations concurs with the results obtained by PNR, showing a reduction of the magnetic moment per La $_{x}$ Eu $_{1 - x}$ O for increasing lanthanum doping. This reduction of the magnetic moment is explained by the reduction of the number of Eu-4 $f$ electrons present in all the magnetic interactions in EuO films. Finally, we show that an upwards shift of the Fermi energy with La or Gd doping gives rise to half-metallicity for doping levels as high as 3.2 %.

The elevated Curie temperature and half-metallicity in the ferromagnetic semiconductor La $_{x}$ Eu $_{1 - x}$ O

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The elevated Curie temperature and half-metallicity in the ferromagnetic semiconductor La $_{x}$ Eu $_{1 - x}$ O

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The elevated Curie temperature and half-metallicity in the ferromagnetic semiconductor Laxx​Eu1−x1−x​O

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The elevated Curie temperature and half-metallicity in the ferromagnetic semiconductor Laxx​Eu1−x1−x​O

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The elevated Curie temperature and half-metallicity in the ferromagnetic semiconductor La $_{x}$ Eu $_{1 - x}$ O

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The elevated Curie temperature and half-metallicity in the ferromagnetic semiconductor La $_{x}$ Eu $_{1 - x}$ O

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