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Valence mediated tunable magnetism and electronic properties by ferroelectric polarization switching in 2D FeI 2 /In 2 Se 3 van der Waals heterostructures

Journal Article


Abstract


  • Exploring two-dimensional (2D) materials with both ferromagnetic and ferroelectric properties is scientifically interesting and of great technical importance to numerous functionalities in nanoscale devices. In this work, we have demonstrated a strong magnetoelectric coupling that appeared in the 2D FeI 2 /In 2 Se 3 van der Waals heterostructure. FeI 2 layers undergo a transition from ferromagnetic to antiferromagnetic by reversing the direction of ferroelectric polarization. First-principles calculation predicts a new magnetoelectronic coupling mechanism which is completely different from the Dzyaloshinskii-Moriya (DM) effect in multiferroic materials. Because of the polarization discontinuity at the interface, the valence states of Fe ions change between +2 and +3 for two different polarization directions, leading to the magnetic interaction variation between the direct exchange and I ion mediated superexchange. Moreover, metallic 2D electron gas (2DEG) transfers from the surface of FeI 2 to In 2 Se 3 when the polarization reverses, which induces the spin polarization of the heterostructure varying from 93% to 0%. Our work is the first realization of manipulation magnetism by an electric field in full 2D van der Waals heterostructures.

UOW Authors


  •   Sun, Wei (external author)
  •   Wang, Wenxuan (external author)
  •   Chen, Dong (external author)
  •   Cheng, Zhenxiang
  •   Wang, Yuanxu (external author)

Publication Date


  • 2019

Citation


  • Sun, W., Wang, W., Chen, D., Cheng, Z. & Wang, Y. (2019). Valence mediated tunable magnetism and electronic properties by ferroelectric polarization switching in 2D FeI 2 /In 2 Se 3 van der Waals heterostructures. Nanoscale, 11 (20), 9931-9936.

Scopus Eid


  • 2-s2.0-85066054622

Number Of Pages


  • 5

Start Page


  • 9931

End Page


  • 9936

Volume


  • 11

Issue


  • 20

Place Of Publication


  • United Kingdom

Abstract


  • Exploring two-dimensional (2D) materials with both ferromagnetic and ferroelectric properties is scientifically interesting and of great technical importance to numerous functionalities in nanoscale devices. In this work, we have demonstrated a strong magnetoelectric coupling that appeared in the 2D FeI 2 /In 2 Se 3 van der Waals heterostructure. FeI 2 layers undergo a transition from ferromagnetic to antiferromagnetic by reversing the direction of ferroelectric polarization. First-principles calculation predicts a new magnetoelectronic coupling mechanism which is completely different from the Dzyaloshinskii-Moriya (DM) effect in multiferroic materials. Because of the polarization discontinuity at the interface, the valence states of Fe ions change between +2 and +3 for two different polarization directions, leading to the magnetic interaction variation between the direct exchange and I ion mediated superexchange. Moreover, metallic 2D electron gas (2DEG) transfers from the surface of FeI 2 to In 2 Se 3 when the polarization reverses, which induces the spin polarization of the heterostructure varying from 93% to 0%. Our work is the first realization of manipulation magnetism by an electric field in full 2D van der Waals heterostructures.

UOW Authors


  •   Sun, Wei (external author)
  •   Wang, Wenxuan (external author)
  •   Chen, Dong (external author)
  •   Cheng, Zhenxiang
  •   Wang, Yuanxu (external author)

Publication Date


  • 2019

Citation


  • Sun, W., Wang, W., Chen, D., Cheng, Z. & Wang, Y. (2019). Valence mediated tunable magnetism and electronic properties by ferroelectric polarization switching in 2D FeI 2 /In 2 Se 3 van der Waals heterostructures. Nanoscale, 11 (20), 9931-9936.

Scopus Eid


  • 2-s2.0-85066054622

Number Of Pages


  • 5

Start Page


  • 9931

End Page


  • 9936

Volume


  • 11

Issue


  • 20

Place Of Publication


  • United Kingdom