Current Applied Physics

Korean Physical Society (한국물리학회)
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XMCD and PES study of a compensated-ferrimagnetic half-metal Mn3Ga

  • Seong, Seungho (Department of Physics, The Catholic University of Korea (CUK)) ;
  • Lee, Eunsook (Department of Physics, The Catholic University of Korea (CUK)) ;
  • Kim, Hee Yeon (Department of Physics, The Catholic University of Korea (CUK)) ;
  • Kim, Younghak (Pohang Accelerator Laboratory (PAL), POSTECH) ;
  • Baik, Jaeyoon (Pohang Accelerator Laboratory (PAL), POSTECH) ;
  • Kang, J.S. (Department of Physics, The Catholic University of Korea (CUK))
  • Received : 2018.03.01
  • Accepted : 2018.04.18
  • Published : 2018.11.30
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Abstract

By employing soft X-ray magnetic circular dichroism (XMCD), soft X-ray absorption spectroscopy (XAS), and photoemission spectroscopy (PES), we have investigated the electronic structure of the candidate zero-moment half-metallic $Mn_3Ga$. We have studied the ball-milled and annealed $Mn_3Ga$ powder samples that exhibit nearly zero magnetization. Mn 2p XAS revealed that Mn ions in $Mn_3Ga$ are nearly divalent for both of the Mn ions having the locally octahedral symmetry and those having the locally tetrahedral symmetry. The measured Mn 2p XMCD spectrum of $Mn_3Ga$ is very similar to that of ferrimagnetic $MnFe_2O_4$ having divalent Mn ions. The sum-rule analysis of the Mn 2p XMCD spectrum shows that both the spin and orbital magnetic moments of Mn ions in $Mn_3Ga$ are negligibly small, in agreement with the nearly compensated-ferrimagnetic ground state of $Mn_3Ga$. The valence-band PES spectrum of $Mn_3Ga$ agrees well with the calculated density of states, supporting the half-metallic electronic structure of $Mn_3Ga$.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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