Thermal and magnetic properties of a ferrimagnetic nanoparticle with spin-3/2 core and spin-1 shell structure

Yüksel, Yusuf; Aydıner, Ekrem; Polat, Hamza

doi:10.1016/j.jmmm.2011.07.011

Cited by 103 publications

(33 citation statements)

References 29 publications

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“…We can also see from this figure that both the compensation and critical temperatures of the system increase as the absolute value of r cs increases. The behavior of these curves is similar with that obtained by Yüksel et al [35] for a ferrimagnetic NP with spin- 3 2 core and spin-1 shell structure.…”

Section: Numerical Results and Discussionsupporting

confidence: 87%

“…The compensation point has also been obtained theoretically in Refs. [15,28,35,36] and experimentally by Estrader et al [3] for the magnetization of the core/shell particles based on F e-oxides and Mn-oxides. We can clearly see, at zero temperature, that the M T curves have three saturation magnetizations M sat = −0.218, −0.342, and −0.369 when the core/shell antiferromagnetic interfacial coupling are selected as r cs = −0.1, −0.3, and −0.5, respectively, which indicate that the saturation value of the total longitudinal magnetization decreases with the decrease of r cs .…”

Section: Numerical Results and Discussionmentioning

confidence: 96%

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Thermodynamic Properties of the Core/Shell Antiferromagnetic Ising Nanocube

Hamri

Bouhou

Essaoudi

et al. 2015

J Supercond Nov Magn

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Section: Numerical Results and Discussionsupporting

confidence: 87%

Section: Numerical Results and Discussionmentioning

confidence: 96%

Thermodynamic Properties of the Core/Shell Antiferromagnetic Ising Nanocube

Hamri

Bouhou

Essaoudi

et al. 2015

J Supercond Nov Magn

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show abstract

“…At the interface, we define an antiferromagnetic interaction between core and shell spins (see figure 1 in Ref. [31]). Construction of such kind of model allows us to simulate a ferrimagnetic small particle formed by more than one compound.…”

Section: Formulationmentioning

confidence: 99%

“…Namely, in the former group, equilibrium properties of these systems * Electronic address: hamza.polat@deu.edu.tr have been investigated by a variety of techniques such as mean field theory (MFT) [13,14,16,17], effectivefield theory (EFT) [15][16][17][18][19][20], Green functions formalism [21], variational cumulant expansion (VCE) [22,23] and Monte Carlo (MC) simulations [24][25][26][27][28][29][30][31]. Based on MC simulations, particular attention has been paid on the exchange bias (EB) effect in magnetic core-shell nanoparticles where the hysteresis loop exhibits a shift below the Néel temperature of the antiferromagnetic shell due to the exchange coupling on the interface region of ferromagnetic core and antiferromagnetic shell.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic phase transition properties and hysteretic behavior of a ferrimagnetic core–shell nanoparticle in the presence of a time dependent magnetic field

Yüksel¹,

Vatansever²,

Polat³

2012

J. Phys.: Condens. Matter

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We have presented dynamic phase transition features and stationary-state behavior of a ferrimagnetic small nanoparticle system with a core-shell structure. By means of detailed Monte Carlo simulations, a complete picture of the phase diagrams and magnetization profiles have been presented and the conditions for the occurrence of a compensation point Tcomp in the system have been investigated. According to Néel nomenclature, the magnetization curves of the particle have been found to obey P-type, N-type and Q-type classification schemes under certain conditions. Much effort has been devoted to investigation of hysteretic response of the particle and we observed the existence of triple hysteresis loop behavior which originates from the existence of a weak ferromagnetic core coupling Jc/J sh , as well as a strong antiferromagnetic interface exchange interaction Jint/J sh . Most of the calculations have been performed for a particle in the presence of oscillating fields of very high frequencies and high amplitudes in comparison with exchange interactions which resembles a magnetic system under the influence of ultrafast switching fields. Particular attention has also been paid on the influence of the particle size on the thermal and magnetic properties, as well as magnetic features such as coercivity, remanence and compensation temperature of the particle. We have found that in the presence of ultrafast switching fields, the particle may exhibit a dynamic phase transition from paramagnetic to a dynamically ordered phase with increasing ferromagnetic shell thickness.

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Investigation of bond dilution effects on the magnetic properties of a cylindrical Ising nanowire

Yüksel

Akıncı

Polat

2012

Physica Status Solidi (b)

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A cylindrical magnetic nanowire system composed of ferromagnetic core and shell layers has been investigated by using effective field theory with correlations. Both ferromagnetic and antiferromagnetic exchange couplings at the core-shell interface have been considered. Main attention has been focused on the effects of the quenched disordered shell bonds, as well as interface bonds on the magnetic properties of the system. A complete picture of the phase diagrams and magnetization profiles has been represented. It has been shown that for the antiferromagnetic nanowire system, the magnetization curves can be classified according to Néel theory of ferrimagnetism and it has been found that under certain conditions, the magnetization profiles may exhibit Q-type, P-type, N-type and L-type behaviors. The observed L-type behavior has not been reported in the literature before for the equilibrium properties of nanoscaled magnets. As another interesting feature of the system, it has been found that a compensation point can be induced by a bond dilution process in the surface. Furthermore, we have not found any evidence of neither the first order phase transition characteristics, nor the reentrance phenomena. * Also at Dokuz Eylül University, Graduate School of Natural and Applied Sciences, Turkey † Electronic address: hamza.polat@deu.edu.trwhere σ = ±1. J c , J sh and J int define core, shell and interface coupling parameters, respectively. Each summation in Eq.(1) is carried out over the nearest neighbor spins. We assume that the nearest neighbor interactions are randomly

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Thermal and magnetic properties of a ferrimagnetic nanoparticle with spin-3/2 core and spin-1 shell structure

Cited by 103 publications

References 29 publications

Thermodynamic Properties of the Core/Shell Antiferromagnetic Ising Nanocube

Thermodynamic Properties of the Core/Shell Antiferromagnetic Ising Nanocube

Dynamic phase transition properties and hysteretic behavior of a ferrimagnetic core–shell nanoparticle in the presence of a time dependent magnetic field

Investigation of bond dilution effects on the magnetic properties of a cylindrical Ising nanowire

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