نتایج جستجو برای: ferrimagnetism
تعداد نتایج: 196 فیلتر نتایج به سال:
Ferrimagnetism and single-particle excitations in a periodic Anderson model on the honeycomb lattice
One of the core issues for multiferroicity is the strongly coupled ferroelectric polarization and magnetization, while so far most multiferroics have antiferromagnetic order with nearly zero magnetization. Magnetic spinel compounds with ferrimagnetic order may be alternative candidates offering large magnetization when ferroelectricity can be activated simultaneously. In this work, we investiga...
Different complexing agents were used to prepare Ni–Mg–Zn ferrite with the composition formula Ni0.2Mg0.2Zn0.6Fe2O4 via sol–gel method, which included citric acid, oxalic egg white, and EDTA. The without agent was also prepared as a comparison. chemical phases of samples analyzed by X-ray diffraction (XRD), indicated that had spinel phase structure. lattice constants are in range 8.3980–8.4089 ...
The Hubbard model is a “highly oversimplified model” for electrons in a solid which interact with each other through extremely short ranged repulsive (Coulomb) interaction. The Hamiltonian of the Hubbard model consists of two pieces; Hhop which describes quantum mechanical hopping of electrons, and Hint which describes nonlinear repulsive interaction. Either Hhop or Hint alone is easy to analyz...
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