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Complex magnetic structure and magnetocapacitance response in a non-oxide NiF2 system.

S Arumugam1, P Sivaprakash2, Ambesh Dixit3

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Nickel difluoride (NiF2) exhibits complex magnetic transitions and significant magnetocapacitance. This non-oxide material shows potential for dielectric applications due to its unique properties.

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Area of Science:

  • Solid State Physics
  • Materials Science
  • Magnetism

Background:

  • Non-oxide multifunctional materials are crucial for advanced applications.
  • Understanding complex magnetic structures is key to novel material design.

Purpose of the Study:

  • To investigate the complex magnetic structure and magnetocapacitance of NiF2.
  • To explore the potential of NiF2 for dielectric applications.

Main Methods:

  • Experimental measurements of temperature and field-dependent properties.
  • Density functional theory (DFT) calculations for magnetic structure analysis.

Main Results:

  • NiF2 shows anti-ferromagnetic transition near 68.5 K, weak ferromagnetism, and a metastable ferromagnetic phase below 10 K.
  • High dielectric response (>10^3) with low loss (<0.5) near room temperature, attributed to intrinsic grain contribution.
  • Large negative magnetocapacitance (>90%) observed under a 1 T magnetic field.

Conclusions:

  • NiF2 possesses a complex magnetic structure explained by DFT calculations.
  • The material demonstrates significant dielectric properties and magnetocapacitance, suggesting utility in dielectric applications.
  • NiF2 presents a promising new non-oxide multifunctional material.