Ferromagnetic Heisenberg model with the Dzyaloshinskii-Moriya interaction Феромагнiтна модель Гайзенберга зi взаємодiєю Дзялошинського-Морiя

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ALBAYRAK E.

Condensed Matter Physics, cilt.25, sa.3, 2022 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 25 Sayı: 3
  • Basım Tarihi: 2022
  • Doi Numarası: 10.5488/cmp.25.33701
  • Dergi Adı: Condensed Matter Physics
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, INSPEC, Directory of Open Access Journals
  • Anahtar Kelimeler: spin 1/2, ferromagnetic, Dzyaloshinskii-Moriya, XYZ model, magnetization, phase diagrams, ANTIFERROMAGNET MODEL, ANISOTROPY, TRANSITION, SKYRMIONS, CUMN
  • Kayseri Üniversitesi Adresli: Hayır

Özet

© This work is licensed under a Creative Commons Attribution 4.0 International LicenseThe spin-1/2 Heisenberg model is formulated in terms of a mean-field approximation (MFA) by using the matrix forms of spin operators Sx, Sy and Sz in three-dimensions. The considered Hamiltonian consists of bilinear exchange interaction parameters (Jx, Ky, Jz), Dzyaloshinskii-Moriya interactions (Δx, Δy, Δz ) and external magnetic field components (Hx, Hy, Hz). The magnetization and its components are obtained in the MFA with the general anisotropic case with Jx ≠ Jy ≠ Jz for various values of coordination numbers q. Then, the thermal variations of magnetizations are investigated in detail to obtain the phase diagrams of the model for the isotropic case with Jx = Jy = Jz > 0. It is found that the model exhibits ferromagnetic, paramagnetic, random phase regions and an extra ferromagnetic phase at which the components of magnetizations present branching