Nucleation of reversed domain and pinning effect on domain wall motion in nanocomposite magnets

Li, Z. B.; Shen, Baogen; Niu, Erwu; Sun, J. R.

doi:10.1063/1.4817968

Cited by 33 publications

(19 citation statements)

References 27 publications

(38 reference statements)

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“…This means the assemblies will exhibit no net magnetic moments. Since that the surfaces of magnetic nanoparticles were bare and contacted closely, the magnetic moments were incapable of restoring to the disordered state thoroughly due to the magnetic dipolar interaction and the surface pinning effect 26 27 . These remnant magnetic moments caused emergence of so-called remanence.…”

Section: Resultsmentioning

confidence: 99%

Magnetic assembly-mediated enhancement of differentiation of mouse bone marrow cells cultured on magnetic colloidal assemblies

Sun

Huang

et al. 2014

Sci Rep

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Here we reported an interesting phenomenon that the field-induced assemblies of magnetic nanoparticles can promote the differentiation of primary mouse bone marrow cells into osteoblasts. The reason was thought to lie in the remnant magnetic interaction inside the assemblies which resulted from the magnetic field-directed assembly. Influence of the assemblies on the cells was realized by means of interface effect rather than the internalization effect. We fabricated a stripe-like assemblies array on the glass plate and cultured cells on this surface. We characterized the morphology of assemblies and measured the mechanic property as well as the magnetic property. The cellular differentiation was measured by staining and quantitative PCR. Finally, Fe uptake was excluded as the reason to cause the phenomenon.

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Section: Resultsmentioning

confidence: 99%

Magnetic assembly-mediated enhancement of differentiation of mouse bone marrow cells cultured on magnetic colloidal assemblies

Sun

Huang

et al. 2014

Sci Rep

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“…31 So there exists the reversed domain, but the energy barrier is at hard grain interface hindering the domain wall motion. [32][33][34][35] In magnetization reversal, the nucleation of reversed domain is necessary, 32,[36][37][38] and in the magnetic relaxation a thermally activated nucleation is transferred into hard grain surface, which is due to that the energy barrier is reduced by the isotropic exchange coupling and overcome with the driving of thermal fluctuation, 20,38,39 subsequently leading to the depinning and free propagation of domain wall within the hard grain. Therefore, although the thermal activation involves magnetization reversal in soft grains, it originates from magnetization reversal in hard grains owing to the exchange coupling at hard grain interface.…”

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confidence: 99%

Investigation on intergranular exchange coupling effect in Pr9Fe85.5B5.5 ribbons

Zhang

Wang

et al. 2014

Applied Physics Letters

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The intergranular exchange coupling effects are investigated via thermal activation of magnetization reversal in the magnetic relaxation process, combined with Henkel plots and the measurement of susceptibilities in three types of Pr9Fe85.5B5.5 ribbons. Exchange interaction between hard-hard grains is proposed in optimal melt-spun ribbons, as well as in over melt-spun ribbons even bearing a weak exchange coupling between soft-hard grains. In under melt-spun ribbons, the decoupled effect is proposed between hard-hard grains. These investigations may contribute to a clear understanding about the complicated nature of the intergranular exchange coupling in nanocomposite magnets.

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“…As given in Fig. 3 (b), the magnetization increases slowly with magnetic field, which indicates that the pinning mechanism dominates in the magnetization reversal process [19]. The applied field dependence of coercivity obtained from minor hysteresis loops shows that the coercivity increases initially slowly with the field until a critical field where it starts to increase rather rapidly.…”

Section: Coercivity Mechanismmentioning

confidence: 72%

Structure, Magnetic Properties, and Coercivity Mechanism of Rapidly Quenched Mn<sub><italic>x</italic></sub>Ga Ribbons

et al. 2015

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The microstructure, magnetic properties and coercivity mechanism of rapidly quenched rare-earth-free L1 0 -Mn 1.86 Ga and D0 22 -Mn 3 Ga permanent magnetic ribbons have been investigated. The high remanence M r of 61.3 emu/g and maximum energy product of 2.1 MGOe are obtained in L1 0 -Mn 1.86 Ga ribbons. The coercivity H C of L1 0 -Mn 1.86 Ga and D0 22 -Mn 3 Ga are 2.7 and 6.9 kOe, respectively. The different coercivity mechanism and exchange coupling behaviour have been discussed, upon the measurement of minor loops and Henkel plots. The minor second phase at grain boundaries in L1 0 -Mn 1.86 Ga ribbons may act as pinning center of domain wall, thus reduce the exchange coupling. Both ribbons with Curie temperature above 700 K may be promising permanent magnets at room temperature.

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Nucleation of reversed domain and pinning effect on domain wall motion in nanocomposite magnets

Cited by 33 publications

References 27 publications

Magnetic assembly-mediated enhancement of differentiation of mouse bone marrow cells cultured on magnetic colloidal assemblies

Magnetic assembly-mediated enhancement of differentiation of mouse bone marrow cells cultured on magnetic colloidal assemblies

Investigation on intergranular exchange coupling effect in Pr9Fe85.5B5.5 ribbons

Structure, Magnetic Properties, and Coercivity Mechanism of Rapidly Quenched Mn<sub><italic>x</italic></sub>Ga Ribbons

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