Micromagnetic Simulation of Magnetic Inversion Properties of Ce1.66Mg1.34Co3 and α″-Fe16N2 Multilayer Gradient Films

doi:10.19596/j.cnki.1001-246x.8709

Abstract

Abstract:

In order to improve the magnetic properties of permanent magnet films, based on the theory of micromagnetism, we have studied the magnetization properties of Ce_1.66Mg_1.34Co₃ and α″-Fe₁₆N₂ exchange coupled multilayer gradient films by using software OOMMF, and the influence of magnetic crystal anisotropy gradient on the properties of multilayer films systematically. We analyze the changes of remanence, coercivity, hysteresis loop and energy during magnetization reversal process. We find that the coercivity and residual magnetization of the films can be effectively increased by decreasing the anisotropic gradient of magnetic crystals or increasing the anisotropy difference at the interface, so as to improve the magnetic properties. A magnetic vortex state is found by calculating the magnetic moment distribution, and the generation of this magnetic vortex state is accompanied by the increase of system energy.

Key words: multilayer gradient films, coercivity, micromagnetic simulation, magnetization inversion

CLC Number:

O469

Liqian CHEN, Suying ZHANG. Micromagnetic Simulation of Magnetic Inversion Properties of Ce_1.66Mg_1.34Co₃ and α″-Fe₁₆N₂ Multilayer Gradient Films[J]. Chinese Journal of Computational Physics, 2024, 41(2): 239-244.

Figures/Tables 7

Fig.1 Ce1.66Mg1.34Co3 and α″-Fe16N2 exchange coupled gradient film models in different gradients (stereogram and two-dimensional diagram)

Table 1 Magnetic parameters of hard magnetic Ce1.66Mg1.34Co3 and soft magnetic α″-Fe16N2

Phase	M_s/(A·m^-1)	K/(J·m ^-3)	A_ex/(J·m^-1)
Ce_1.66Mg_1.34Co₃	3.0 × 10⁵	7 × 10⁵	1.13 × 10^-11
α″-Fe₁₆N₂	2.235 × 10⁶	2.5 × 10⁵	3.25 × 10^-11

Fig.2 Hysteresis loops of multilayer exchange coupled gradient films with different gradient structures

Fig.3 Magnetic energy product of coupled gradient films with different gradient structures

Fig.4 Magnetic moment distribution of multilayer exchange coupled gradient films (x-y plane view, from left to right, hard magnetosphere cross section, hard and soft magnetosphere interface, soft magnetosphere cross section. Blue arrows represent the same direction as the initial magnetization, red arrows are the opposite.) (a) H=3 T; (b) H=1.45 T; (c) H=1.35 T; (d) H=1.21 T; (e) H=0.38 T; (f) H=-0.29 T; (g) H=-0.54 T; (h) H=-0.60 T; (i) H=-1.28 T

Fig.5 Two-dimensional distribution of magnetic moments at the hard-soft magnetic interface of multilayer exchange coupled gradient films at H=- 0.54 T (x-y plane view)

Fig.6 Variations of various energies during the magnetization process of coupled gradient films

References 20

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Micromagnetic Simulation of Magnetic Inversion Properties of Ce_1.66Mg_1.34Co₃ and α″-Fe₁₆N₂ Multilayer Gradient Films

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