Magnetocaloric properties of the spin-S (S >= 1) Ising model driven by a time dependent oscillating magnetic field

YÜKSEL Y., VATANSEVER E., AKINCI Ü.

PHYSICS LETTERS A, cilt.388, 2021 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 388
  • Basım Tarihi: 2021
  • Doi Numarası: 10.1016/j.physleta.2020.127079
  • Dergi Adı: PHYSICS LETTERS A
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Communication Abstracts, INSPEC, Metadex, Philosopher's Index, zbMATH, DIALNET, Civil Engineering Abstracts
  • Anahtar Kelimeler: Dynamic phase transitions, Magnetocaloric properties, Isothermal entropy change, Cooling capacity, CRITICAL-BEHAVIOR, PHASE-TRANSITION, HYSTERESIS, FERROMAGNET
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

By means of mean field approximation, we have investigated magnetocaloric properties of the spin-S Ising model for some spin values S = 1, 3/2, 2, 5/2, 3 and 7/2 on a simple cubic lattice. The considered system is driven by a time dependent oscillating magnetic field including a bias field. Effects of the spin magnitude, oscillating magnetic field amplitude (h(0)/J) and bias field (h(b)/J) on the dynamic critical behavior, isothermal entropy change (vertical bar Delta S-M vertical bar) and cooling capacity (q) of the system have been elucidated in detail. Our numerical outcomes indicate that both bias and oscillating magnetic fields prominently affect the vertical bar Delta S-M vertical bar and q values of the system. When h(b)/J is increased, both vertical bar Delta S-M vertical bar and q quantities get larger for all considered spin magnitudes, in the absence of oscillating field. It is found that there is a linear relationship between q and h(b)/J such that it will obey the law: q proportional to gamma(S)h(b)/J for all spin magnitudes. Moreover, the isothermal entropy change varies in such manner that it exhibits an exponential behavior, vertical bar Delta S-M vertical bar proportional to e(alpha h0/J) for a fixed value of bias field. These results show that the magnetocaloric properties of a material can be adjusted by changing the oscillating magnetic field components as well as bias field. (C) 2020 Elsevier B.V. All rights reserved.