• Static properties of spin-crossover with magnetic interaction of Spin-1 Blume-Emery-Griffiths model for two-sublattices 

  Veliu, Valon; Özüm, Songül; Yalçın, Orhan; Erdem, Rıza (2022)

  The static properties of the spin-1 Blume-Emery-Griffiths (BEG) model for two-sublattices with the presence of an external magnetic field for spin-crossover (SCO) and magnetic ordering are presented. To study the static ...

• Static and dynamic properties of two-sublattice spin-crossover systems 

  Yalçın, Orhan; Veliu, Valon; Özüm, Songül; Erdem, Rıza (Elsevier B.V., 2022)

  We investigate the static and dynamic properties of spin-crossover systems in the presence of an external magnetic field using two-sublattice Ising-like Hamiltonian. At low temperatures both sublattices are in the LS state, ...

• Widom lines related with the relaxational dynamics for the Ising model 

  Özüm, Songül (MECO, 2021)

  We have presented a phenomenological description for the relaxation dynamics (RD) of Ising ferromagnets in the presence of external magnetic field (h). We calculate two characteristic times using the rate constants which ...

• Ising-like model for the two-step spin-crossover systems: Static properties with magnetic field effects using cluster variation method 

  Veliu, Valon; Erdem, Rıza; Özüm, Songül; Yalçın, Orhan (Institute of Molecular Physics, Polish Academy of Sciences Faculty of Physics, Adam Mickiewicz University, Poznań, 2021)

  We investigate the static properties of a two−sublattice Ising−like Hamiltonian for spin-crossover (SCO) systems in the presence of an external magnetic field. Self−consistent equations are obtained using cluster variation ...

• Phenomenological Dynamics of Ising Magnets in the Presence of Magnetic Field: Widom Lines Captured from Slow Relaxation Time 

  Özüm, Songül (2021)

  A complete phenomenological description for the relaxation dynamics of the Ising ferromagnets in the presence of external magnetic field h is given by using the pair approximation. To study the relaxation dynamics, we ...

• Synthesis and investigation of small g-values for smart spinel ferrite nanoparticles 

  Bayrakdar, Harun; Yalçın, Orhan; Özüm, Songül; Cengiz, Uğur (Elsevier Science Sa, 2021)

  Smart spinel and hexagonal ferrite nanoparticles (NPs) have been fabricated by ethylenediaminetetraacetic acid (EDTA) and cetyltrimethylammonium bromide (CTAB) assisted hydrothermal route by using NaOH solution. Electron ...

• Nanosized Monolayer on Square Lattice within Spin-1 Ising Model: Hysteretic Properties with Odd Interactions 

  Özüm, Songül; Kavlak, Ramazan; Erdem, Rıza; Yalçın, Orhan (Polish Acad Sciences Inst Physics, 2021)

  The hysteretic properties of a nanosized monolayer on the square lattice have been studied based on the spin-1 Ising model, including a single-ion anisotropy (D) and dipolar-quadrupolar (or odd, L) interaction parameters ...

• Origin of Cross-Over Phenomenon of Hysteresis Loops and High Absorption Loss Properties for Spinel Ferrite Nanoparticles 

  Yalçın, Orhan; Bayrakdar, Harun; Özüm, Songül (Polish Acad Sciences Inst Physics, 2021)

  Spinel ferrite nanoparticles have been synthesized by the surfactant-assisted hydrothermal route using cetyltrimethylammonium bromide (CTAB) and ethylenediaminetetraacetic acid (EDTA) in the NaOH solution. Temperature ...

• Hysteretic dipolar and quadrupolar properties of the spin-1 Blume-Emery-Griffiths model under pair approximation 

  Özüm, Songül; Erdem, Rıza; Yalçın, Orhan; Görgülüer, Ömer (World Scientific, 2021)

  As a continuation of previously published work [A. Erdinç and M. Keskin, Int. J. Mod. Phys. B 18, 1603 (2004), doi:10.1142/S0217979204024823] the hysteretic properties of magnetization (m) and quadrupolar moment (q) have ...

• Nanosized monolayer on the square lattice within spin-1 ising Model: Hysteretic properties with odd interactions 

  Kavlak, Ramazan; Özüm, Songül; Erdem, Rıza; Yalçın, Orhan (L.N. Gumilyov Eurasian National University, 2020)

  We propose a theoretical framework for the investigation of M-H and Q-D hysteresis loops for the nanosized monolayer on the square lattice within spin-1 Ising model Hamiltonian with dipolar (J), quadrupolar (K), ...

• Hysteretic properties of magnetization and quadrupolar moment in the blume-emery-griffiths model under the pair approximation 

  Özüm, Songül; Görgülüer, Ömer; Erdem, Rıza; Yalçın, Orhan (L.N. Gumilyov Eurasian National University, 2020)

  The magnetic hysteresis (M-H) and quadrupole hysteresis (Q-D) loops have been investigated for the Blume-Emery-Griffiths (BEG) model using the pair approximation. The observed curves strongly depend on biquadratic exchange ...

• Hysteretic behavior of quadrupolar ordering in a 2D magnetic spin˗1 Ising nanoparticle 

  Erdem, Rıza; Yalçın, Orhan; Özüm, Songül; Şahin, Ayşe; Demirer, Nazlı (Physical Society of the Republic of China, 2021)

  Pair approximation technique has been used to study the quadrupolar ordering properties for the 2D magnetic spin-1 Ising nanoparticles, consisting of core and surface parts with an interface coupling. Similar to the magnetic ...

• On the loci of relaxation time and magnetic dispersion maxima in the Mean-Field Ising model 

  Özüm, Songül (Sakarya University Journal of Science SAUJS, 2020)

  Based on the phenomenological approach, loci of relaxation time and magnetic dispersion maxima near the critical regime in a spin-1/2 mean-field Ising model were performed. The shift in temperature (T) of relaxation time ...

• Determination of the steady-state kinetics in a spin-1 Ising model using path probability method 

  Özüm, Songül; Erdem, Rıza (World Scientific Publ Co PTE Ltd, 2020)

  As a continuation of our previously published work, we propose a theoretical framework for the determination of steady-state kinetics in a spin-1 Ising model by the path probability method. The framework is based on the ...

• Dipolar and Quadrupolar Hysteresis in Core-Surface Magnetic Nanoparticles 

  Özüm, Songül; Yalçın, Orhan; Erdem, Rıza (2019)

  Blume-Emery-Griffiths (BEG) model [1] is used to investigate the hysteretic behaviour of dipole (M) and quadrupole ordering (Q) properties peculiar to core/surface (C/S) type hexagonal Ising nanoparticles (HINPs) [2-3]. ...

• Spin-1 Ising modelinde manyetik dağılganlık bağıntısı ve manyetik sönüm faktörünün yol olasılık metodu ile hesaplanması 

  Özüm, Songül; Erdem, Rıza (2019)

  Bu çalışmada, önceki çalışmamızın [1] devamı olarak, manyetik alan altında bilineer (J) ve bikuadratik (K) etkileşme Hamiltonyenli spin-1 Ising Modeli [2, 3] için dinamik (yani kompleks) alınganlık ifadesi X= X¹ iX²[4, ...

• Nanosized Monolayer on the Square Lattice within Spin-1 Ising Model: Magnetic Properties with odd Interactions 

  Kavlak, Ramazan; Özüm, Songül; Erdem, Rıza; Yalçın, Orhan (2020)

  Based on the spin-1 Ising model Hamiltonian with dipolar (bilinear, J), quadrupolar, (biquadratic, K), dipolar-quadrupolar (odd, L) interactions and single-ion anisotropy parameter (D), magnetic properties of the nanosized ...

• Relaxation times obtained from the rate equations using path probability method for the spin-1 Ising model 

  Erdem, Rıza; Özüm, Songül (World Scientific Publishing Co. Pte Ltd, 2019)

  We have presented the time-dependent behaviors of a spin-1 Ising model (with both bilinear and biquadratic interactions) in the neighborhood of the equilibrium states via the path probability method. The rate equations as ...

• Dynamic susceptibility for a spin-1 Isingmodel using the path probability method 

  Özüm, Songül; Erdem, Rıza (Niğde Ömer Halisdemir University, 2019)

  The nonlinear rate equations based on the path probability method is used to derive the dynamic (or complex) susceptibility (  ) for a spin-1 Ising model with bilinear and biquadratic interactions when the external magnetic ...

• Dünya ve Türkiye’de bazı nanoteknoloji çalışmaları 

  Ceyhan, Fatih; Özüm, Songül (Niğde Ömer Halisdemir University, 2019)

  Atom, maddenin tüm özelliklerine sahip, hücre ise canlının tüm özelliklerini gösteren en küçük yapılardır. Büyüklük olarak karşılaştıracak olursak, hücre yaklaşık olarak atomdan 100.000 defa daha büyüktür. “Nano” sözcük ...

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