3D and 1D calculation of hysteresis loops and energy products for anisotropic nanocomposite films with perpendicular anisotropy

Yuan, X.H.; Zhao, Guoping; Yue, Ming; Ye, L.N.; Xia, Jing; Zhang, Xichao; Chang, Jing

doi:10.1016/j.jmmm.2013.05.012

Cited by 28 publications

(22 citation statements)

References 26 publications

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“…In the present work, we adopt a square layered system similar to those used in refs. [23 , 24 ] for Nd 2 Fe 14 B/ α -Fe systems, as shown in Fig. 1 .…”

Section: Resultsmentioning

confidence: 96%

“…Hysteresis loops and spatial spin distributions 23 24 have been calculated for various hard/soft multilayers based on OOMMF software. The spin distributions are generally similar to those without the interface layer, as have been reported in refs.…”

Section: Resultsmentioning

confidence: 99%

“…The spin distributions are generally similar to those without the interface layer, as have been reported in refs. 23 and 24 . Figure 3 shows the hysteresis loops of the Nd 2 Fe 14 B(10 nm)/ α -Fe(10 nm) system with various thicknesses of interface layer.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Deterioration of the coercivity due to the diffusion induced interface layer in hard/soft multilayers

Wen-Jing

Zhao

Ran

et al. 2015

Sci Rep

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Hard/soft permanent magnets have aroused many interests in the past two decades because of their potential in achieving giant energy products as well as their rich variety of magnetic behaviors. Nevertheless, the experimental energy products are much smaller than the theoretical ones due to the much smaller coercivity measured in the experiments. In this paper, the deterioration of the coercivity due to the interface atomic diffusion is demonstrated based on a three dimensional (3D) micromagnetic software (OOMMF) and a formula derived for the pinning field in a hard/soft multilayer, which can be applied to both permanent magnets and exchange-coupled-composite (ECC) media. It is found that the formation of the interface layer can decrease the coercivity by roughly 50%, which is responsible for the observed smaller coercivity in both composite and single-phased permanent magnets. A method to enhance the coercivity in these systems is proposed based on the discussions, consistent with recent experiments where excellent magnetic properties are achieved.

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“…In the present work, we adopt a square layered system similar to those used in refs. [23 , 24 ] for Nd 2 Fe 14 B/ α -Fe systems, as shown in Fig. 1 .…”

Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Deterioration of the coercivity due to the diffusion induced interface layer in hard/soft multilayers

Wen-Jing

Zhao

Ran

et al. 2015

Sci Rep

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“…For economic reasons, many scientific teams have worked on searching for new RE-free/reduced hard magnetic materials that can fill the gap between these two kinds of magnets [ 11 ]. One promising research direction is nanotechnology, allowing us to obtain nanosized magnetic systems and enabling the introduction of an additional magnetic anisotropy by the interaction between nano-objects [ 12 , 13 , 14 , 15 ]. Surface and size effects are also important.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Hard Magnetic Properties in Fraktal-Like Nano and Mesoscopic Grains

et al. 2021

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The paper refers to Monte Carlo magnetic simulations for fractal-like nano and mesoscopic grains. The analyzed objects differed in the size, surface development, magnetic anisotropy and the spin values attributed to the system nodes inside the fractal. Such an approach allowed us to determine their magnetization processes as well as optimization characteristics in the direction to enhancement of hard magnetic properties. As it was shown, the size effects depend on the chosen value of magnetic anisotropy. In the case of fractals with ultra-high coercivity, the decreasing of their size leads to deterioration of coercivity, especially for the high surface to volume ratio. Opposite effects were observed for soft magnetic fractals when the nanostructure caused an appearance of the coercive field, and the maximum of energy product was predictably significantly higher than for conventional rare earths’ free permanent magnets.

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“…Simulations of magnetization processes have significant meaning in regards to both scientific and practical points of view [ 1 , 2 , 3 , 4 , 5 , 6 ]. The observed progress in technologies utilizing magnetic materials requires new magnets with unique properties optimized for different applications.…”

Section: Introductionmentioning

confidence: 99%

From Atomic Level to Large-Scale Monte Carlo Magnetic Simulations

et al. 2020

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This paper refers to Monte Carlo magnetic simulations for large-scale systems. We propose scaling rules to facilitate analysis of mesoscopic objects using a relatively small amount of system nodes. In our model, each node represents a volume defined by an enlargement factor. As a consequence of this approach, the parameters describing magnetic interactions on the atomic level should also be re-scaled, taking into account the detailed thermodynamic balance as well as energetic equivalence between the real and re-scaled systems. Accuracy and efficiency of the model have been depicted through analysis of the size effects of magnetic moment configuration for various characteristic objects. As shown, the proposed scaling rules, applied to the disorder-based cluster Monte Carlo algorithm, can be considered suitable tools for designing new magnetic materials and a way to include low-level or first principle calculations in finite element Monte Carlo magnetic simulations.

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3D and 1D calculation of hysteresis loops and energy products for anisotropic nanocomposite films with perpendicular anisotropy

Cited by 28 publications

References 26 publications

Deterioration of the coercivity due to the diffusion induced interface layer in hard/soft multilayers

Deterioration of the coercivity due to the diffusion induced interface layer in hard/soft multilayers

Enhancement of Hard Magnetic Properties in Fraktal-Like Nano and Mesoscopic Grains

From Atomic Level to Large-Scale Monte Carlo Magnetic Simulations

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