Hysteretic features of Ising-type segmented nanostructure with alternating magnetic wires

Mean field and Monte Carlo simulations techniques are applied to study the behavior of a mixed Ising spin model in a square lattice where spins 7/2 are located in alternating sites with spins 3/2. There is an antiferromagnetic interaction between nearest neighbors, ferromagnetic interactions between next-nearest neighbors, crystal fields, and a magnetic external field. The role of the different interactions in the magnetic behavior of the system is explored. It is found that depending on the combination of parameters in the Hamiltonian this system presents multiple hysteresis loops, exchange bias, compensation temperatures, and discontinuous magnetizations. The results are compared with previous studies that do not include the ferromagnetic next-nearest neighbor interactions and found that they can have a strong effect in the magnetic behavior of the system.

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“…This behavior was experimentally demonstrated by LaGrow et al [ 63 ] in monodisperse nickel nanocubes, as well as theoretically by Kantar. [ 64 ]…”

Section: Resultsmentioning

confidence: 99%

“…This behavior was experimentally demonstrated by LaGrow et al [63] in monodisperse nickel nanocubes, as well as theoretically by Kantar. [64] Next, we make the crystal field stronger and more negative, favoring even more the presence of the lower valued spins (independently of their sign). In Figure 3, D 0 ¼ À2.…”

Section: Mf and MC Hysteresis Curvesmentioning

confidence: 99%

Mixed Spin‐(3/2,7/2) Ising‐Type Ferrimagnet: Monte Carlo–Mean Field Treatment

Espriella

Karimou

Buendı́a

2021

Physica Status Solidi (b)

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“…Precise control of the structural parameters, such to their multifunctional and structural advantages over their analogues, single-component nanostructures. Segmented nanostructures are mainly concentrated on two segments of nanowires, nanotubes and nanowire/nanotube segment [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…The magnetic behavior of nanoscale magnetic objects is strongly dependent on size, shape and composition. There have been a few works where the Ising system is used to investigate magnetic properties of segmented nanostructure [7,25].…”

Section: Introductionmentioning

confidence: 99%

Spin-Waves Excitations in Segmented Nanotubes Consisting of Ferromagnetic and Non-Magnetic Materials

Va¹

2020

Int J Nanoparticles Nanotech

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In the present study, magnetization and dispersion relations of spin-waves propagating along a segmented nanotube constructed of atomic layers of ferromagnetic and non-magnetic materials are considered by use of the Green function method. Within the framework of random-phase approximation, the expression of Green functions for different spins of segmented nanotubes, which is modeled as having a hexagonal cross section are derived. The effects of the composition (p) and exchange couplings on spin-wave spectra and temperature dependence of magnetization are investigated in detail. It was found that small magnetization is observed in the system at small values of parameter p and exchange constants, and the critical temperature at which second-order phase transition occurs is low. When the obtained theoretical results compare with some other works, a very good agreement between them is observed.

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“…Moreover, the hysteresis properties of the Ising-type multisegment nanowire with alternating magnetic spin-1/2 and spin-1 segments were investigated by using the EFT with correlations. [45] In this system, multiple hysteresis loops were obtained.…”

Section: Introductionmentioning

confidence: 99%

Geometry-Dependent Magnetic Properties of Ising-Type Multisegment Nanowires

Kantar

2016

J Supercond Nov Magn

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An effective-field theory (EFT) with correlations has been used to investigate magnetic hysteresis properties and soft/hard magnetic behaviors of an Ising-type multisegment nanowire (IMN) with ferromagnetic/non-magnetic segment structure. The effects of the geometrical parameters on the magnetic hysteresis properties are studied in detail. Morphological dependence of the segmented nanowire is presented via segment thickness (l), wire thickness (d), and aspect ratio (AR) obtained from the exchange interactions. The coercive field (H C ) and squareness (M r /M S ) of the IMN are also derived from hysteresis loops as a function of geometrical parameters. We find that the geometry has a significant effect on the magnetic characteristics of the nanowire. Comparisons between the observed theoretical results and some experimental works of nanowire arrays with hysteresis behaviors are made, and a very good agreement is obtained.

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Hysteretic features of Ising-type segmented nanostructure with alternating magnetic wires

Cited by 56 publications

References 80 publications

Mixed Spin‐(3/2,7/2) Ising‐Type Ferrimagnet: Monte Carlo–Mean Field Treatment

Mixed Spin‐(3/2,7/2) Ising‐Type Ferrimagnet: Monte Carlo–Mean Field Treatment

Spin-Waves Excitations in Segmented Nanotubes Consisting of Ferromagnetic and Non-Magnetic Materials

Geometry-Dependent Magnetic Properties of Ising-Type Multisegment Nanowires

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