Finite interaction range spin glass in the Ising model

Belokon, V. I.; Nefedev, Konstantin; Savunov, M. A.

doi:10.1134/s106378340609023x

Cited by 13 publications

(6 citation statements)

References 19 publications

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“…Similar equations for the Ising model with a ¼ g ¼ 0 have been obtained in Ref. 16 within the random field theory without invoking the ideas of hierarchical SG structure and the method of replicas. Thus, we can assume that Eq.…”

Section: Modelsupporting

confidence: 58%

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Irreversible transitions in the exchange-striction model of spin-glass state

Val’kov

Golovchan

2014

Low Temperature Physics

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Evidence of exchange bias effect and surface spin glass ordering in electron doped Sm0.09Ca0.91MnO3 nanomanganites J.Based on the assumption of a negative volume dependence of random exchange integrals, it is possible to switch to a compressible Sherrington-Kirkpatrick spin-glass model. Within the proposed model, temperature-pressure phase diagrams were calculated and pressure-and magneticfield-induced first-order phase transitions from the initial paramagnetic and spin-glass states to the ferromagnetic state were predicted. It was shown that the application of pressure in the spin-glass state not only increases and shifts magnetic susceptibility, but also reduces the critical magnetic fields of irreversible induced phase transitions from the spin-glass to the ferromagnetic state. The obtained results are used to describe the spin-glass state in (Sm 1-x Gd x ) 0.55 Sr 0.45 MnO 3 . V C 2014 AIP Publishing LLC. [http://dx.

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Section: Modelsupporting

confidence: 58%

“…(8). 16 These solutions, corresponding to the extrema of the free energy, actually lie not at the energy minimum, but at the saddle point (Fig. 8).…”

Section: Modelmentioning

confidence: 95%

Irreversible transitions in the exchange-striction model of spin-glass state

Val’kov

Golovchan

2014

Low Temperature Physics

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“…ISSN: 2581-5164 Available online at Journals.aijr.org In the entire studied temperature range, there is divergence of the FC and ZFC curves, the temperature hysteresis. The appearance of hysteresis can be caused by a number of factors: the existence of a spin glass state (below the merging temperature of the FC and ZFC curves) [41]; states with blocking of the magnetic moment of nanoparticles (below the merging temperature of the FC and ZFC curves) [42]; the state of a super spin glass (micro spin glass) [43], and in the general case -the presence of a metastable state which is formed in the external magnetic field during the interaction of magnetic moments. In the considered case of sample 1, the divergence of the FC and ZFC curves manifests itself in the entire range of the studied temperatures from 4 K to 300 K. It can be assumed that states with blocking of the magnetic moment of nanoparticles or the state of a spin glass are realized in this entire range.…”

Section: Magnetic Properties Of the Samplementioning

confidence: 99%

Nanocomposite Obtained in the Plasma of a Pulsed High Voltage Discharge Using Nickel Electrodes and PTFE

et al. 2021

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In the plasma of pulsed high-voltage discharge, initiated between nickel electrodes in air, when the fluoroplastic is placed in the discharge gap, powder nanocomposite material has been synthesized. The nanocomposite contains NiF2 nanoparticles less than 5 nm in size, dispersed in a matrix consisting of carbon and fluorocarbon substances. The carbonaceous substance contains nanoscale disordered graphite-like regions. The fluorocarbon component of the composite contains fragments of PTFE molecules and fluorocarbon molecular fragments that differ in structure from PTFE molecule’s structure. After annealing the composite in air at 773 K, the initial nanocomposite is transformed into a nanocomposite containing nanosized PTFE and nanoparticles of NiF2 less than 5 nm in size, scattered in a matrix composed of nanographite and low-layer nanosized graphene, after aneling at 1173 K into a material containing NiO nanoparticles less than 10 nm in size. After annealing of the initial nanocomposite in argon atmosphere at 1073 K, the obtained nanocomposite contains Ni nanoparticles with sizes less than 5 nm and carbon and fluorocarbon components. The magnetic susceptibility of the unannealed nanocomposite is investigated. A transition to the antiferromagnetic phase at 73 K was detected. At T = 4K, exchange bias interaction of the AFM / FM type takes place in the composite. There is divergence of the FC and ZFC curves, which can be explained by the presence of a superparamagnetic phase or a spin glass phase in the sample. The field dependences of the magnetic susceptibility measured at T = 300 K show sharp changes that occur at certain values of the magnetic field. Elucidation of the nature of these changes requires additional research.

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“…In [9], authors have presented a method to calculate the critical concentration, which one required for a phase transition to ferromagnetism in the crystal lattices with different numbers of nearest neighbors. We have determined the critical concentration of magnetic atoms for the transition to the ferromagnetic state for the monolayer and submonolayer samples of experimental data for which are given in [7,8].…”

Section: The Critical Concentration and Ferromagnetismmentioning

confidence: 99%

“…If p is greater than this random number, then the new configuration is accepted, otherwise it is rejected, and the old configuration remains the initial for a new attempt; 4. In addition to the spin-flip probability shown above, take into account the spinflip probability, calculated using the energy of the field switch, which prevents the reversal (9): p = e − S i hs T (9) and then generate a random number from the interval (0,1); 5. If the probability of revolution greater than this random number, then the MCsteps (1-3) shown above, otherwise do not change the orientation of the spin and move to the next spin.…”

Section: The Critical Concentration and Ferromagnetismmentioning

confidence: 99%

High Performance Calculation of Magnetic Properties and Simulation of Nonequilibrium Phenomena in Nanofilms

Kapitan

Nefedev

2014

Modeling, Simulation and Optimization of Complex Processes - HPSC 2012

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Images of surface topography of ultrathin magnetic films have been used for Monte Carlo simulations in the framework of the ferromagnetic Ising model to study the hysteresis and thermal properties of nanomaterials. For high performance calculations was used super-scalable parallel algorithm for the finding of the equilibrium configuration. The changing of a distribution of spins on the surface during the reversal of the magnetization and the dynamics of nanodomain structure of thin magnetic films under the influence of changing external magnetic field was investigated.

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Finite interaction range spin glass in the Ising model

Cited by 13 publications

References 19 publications

Irreversible transitions in the exchange-striction model of spin-glass state

Irreversible transitions in the exchange-striction model of spin-glass state

Nanocomposite Obtained in the Plasma of a Pulsed High Voltage Discharge Using Nickel Electrodes and PTFE

High Performance Calculation of Magnetic Properties and Simulation of Nonequilibrium Phenomena in Nanofilms

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