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Magnetic coupling in 3D-hierarchical MnO2 microsphere

  • Muhammad Umair Farooq
  • Zahir Muhammad
  • Syed Khalid
  • Khushbu Fatima
  • Bingsuo ZouEmail author
Article
  • 9 Downloads

Abstract

The development of new routes for the synthesis of the magnetic nanostructures with low cost, simple and rapid growth has inspired as alternative materials in a wide range of applications. In this report, 3D-hierarchical MnO2 microspheres with an ultrathin nanosheet structure have been synthesized by microwave heating method. X-ray diffraction analysis exhibit the microcrystalline nature of microspheres and (211) is the major pattern with the highest intensity. High purity and surface adsorbed oxygen species have been detected by valance state of microspheres. The magnetic properties of microsphere α-MnO2 investigated experimentally and combined with density functional theory (DFT) calculations, suggest the coexistence of ferromagnetic (FM) and antiferromagnetic (AFM) interaction in their nanostructures. The observed FM state is arising from noncollinear magnetic field that tilts two AFM Mn spins consequently, which make a distortion through intermediate oxygen ion in the crystal structure. While, the canted angle between two Mn sublattices lead them to a weak FM state. Similarly, the superexchange interaction is also responsible for magnetic ordering in the adjacent O ion, that can help to exchange magnetic information by direct electron hops of Mn–Mn chain. This is further confirmed from our DFT calculations. They may be found the strong potential for alternative materials other than partially oxidized metal nanoparticles.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Muhammad Umair Farooq
    • 1
  • Zahir Muhammad
    • 2
  • Syed Khalid
    • 3
  • Khushbu Fatima
    • 4
  • Bingsuo Zou
    • 1
    Email author
  1. 1.Beijing Key Laboratory of Nanophotonic and Ultrafine Optoelectronic Systems, School of PhysicsBeijing Institute of TechnologyBeijingChina
  2. 2.National Synchrotron Radiation Laboratory, Center for Excellence in NanoscienceChinese Academy of Sciences, University of Science and Technology of ChinaHefeiChina
  3. 3.Research Center of Materials Science, Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green ApplicationsBeijing Institute of TechnologyBeijingChina
  4. 4.Department of OptometryThe University of FaisalabadFaisalabadPakistan

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