The Amorphous Fe83Nd13B4 Alloy Crystallization Kinetics and High Coercivity State Formation

Mulyukov, Kh. Ya.; Valiev, Ruslan Z.; Korznikova, G. F.; Stolyarov, V. V.

doi:10.1002/pssa.2211120115

Cited by 20 publications

(7 citation statements)

References 6 publications

(3 reference statements)

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“…The M ( T ) behaviour is in agreement with the temperature dependence of the magnetic susceptibility expected for polycrystalline antiferromagnetic materials with T N of 13 K. The T N value is compatible with T N = 13 K for α -MnO 2 nanowires37, but is much lower than 24.5 K of α -MnO 2 single crystal35. The lower T N values of nanosized α -MnO 2 can be attributed the small size effect as demostrated in ferromagnetic Fe 83 Nd 13 B 4 by Mulyukov et al38. It should be noted that the magnetic moment in the high temperature region on the FC curve is lower than on the ZFC curve because of the quick relaxation effect, which also influences the hysteresis loops.…”

Section: Resultssupporting

confidence: 89%

Uncoupled surface spin induced exchange bias in α-MnO2 nanowires

Zeng

Sun

et al. 2014

Sci Rep

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We have studied the microstructure, surface states, valence fluctuations, magnetic properties, and exchange bias effect in MnO2 nanowires. High purity α-MnO2 rectangular nanowires were synthesized by a facile hydrothermal method with microwave-assisted procedures. The microstructure analysis indicates that the nanowires grow in the [0 0 1] direction with the (2 1 0) plane as the surface. Mn3+ and Mn2+ ions are not found in the system by X-ray photoelectron spectroscopy. The effective magnetic moment of the manganese ions fits in with the theoretical and experimental values of Mn4+ very well. The uncoupled spins in 3d3 orbitals of the Mn4+ ions in MnO6 octahedra on the rough surface are responsible for the net magnetic moment. Spin glass behavior is observed through magnetic measurements. Furthermore, the exchange bias effect is observed for the first time in pure α-MnO2 phase due to the coupling of the surface spin glass with the antiferromagnetic α-MnO2 matrix. These α-MnO2 nanowires, with a spin-glass-like behavior and with an exchange bias effect excited by the uncoupled surface spins, should therefore inspire further study concerning the origin, theory, and applicability of surface structure induced magnetism in nanostructures.

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Section: Resultssupporting

confidence: 89%

Uncoupled surface spin induced exchange bias in α-MnO2 nanowires

Zeng

Sun

et al. 2014

Sci Rep

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“…This difference is mainly due to the nanocrystallite structure of a-Fe phase in the Mn-free sample. This result is consistent with the reports that nanocrystal material has lower T c than the conventional material with large grain size [15,16]. The decrease of T c for Nd 2 Fe 14 B phase with the increase of Mn content agrees well with the results reported by Ying-chang Yang, Abache and Benpei Cheng [17][18][19].…”

Section: Resultssupporting

confidence: 95%

“…The a-Fe phase with finer grain sizes should have lower T c from the result of Refs. [15,16]. The more curious thing is: if Mn does not enter the crystal structure of a-Fe phase, the T c would remain unchanged.…”

Section: Resultsmentioning

confidence: 91%

Magnetic properties of Mn substituted Nd–Fe–B composite

Xie¹,

Xu²,

Lin³

et al. 2004

Journal of Magnetism and Magnetic Materials

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“…It is interesting that the T B shows size and shape dependence, and that a smaller size results in a lower T B value. A similar behavior has been documented for other types of nanoparticles, for example, nickel and terbium …”

Section: Experimental Parameters For the Five Samplessupporting

confidence: 80%

“…As imilarb ehavior has been documented for other types of nanoparticles, for example, nickel andt erbium. [17][18][19] Although the hysteresis loop was obtained at 1.8 Kinamagnetic field of up to AE 60 kOe (Figure 5a nd Figure S2 in the Supporting Information), the saturation magnetization (M s )o f as-prepared hyperbranched Fe 4 (OH) 3 (PO 4 ) 3 was not reached. The maximum magnetization (M max )o fa s-prepared hyperbranched Fe 4 (OH) 3 (PO 4 ) 3 is also shown in Ta ble 2.…”

Section: Figures 3abshow Sem Images Of the Product N4mentioning

confidence: 99%

Ferric Phosphate Hydroxide Microstructures Affect Their Magnetic Properties

et al. 2015

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Uniformly sized and shape-controlled nanoparticles are important due to their applications in catalysis, electrochemistry, ion exchange, molecular adsorption, and electronics. Several ferric phosphate hydroxide (Fe4(OH)3(PO4)3) microstructures were successfully prepared under hydrothermal conditions. Using controlled variations in the reaction conditions, such as reaction time, temperature, and amount of hexadecyltrimethylammonium bromide (CTAB), the crystals can be grown as almost perfect hyperbranched microcrystals at 180 °C (without CTAB) or relatively monodisperse particles at 220 °C (with CTAB). The large hyperbranched structure of Fe4(OH)3(PO4)3 with a size of ∼19 μm forms with the “fractal growth rule” and shows many branches. More importantly, the magnetic properties of these materials are directly correlated to their size and micro/nanostructure morphology. Interestingly, the blocking temperature (TB) shows a dependence on size and shape, and a smaller size resulted in a lower TB. These crystals are good examples that prove that physical and chemical properties of nano/microstructured materials are related to their structures, and the precise control of the morphology of such functional materials could allow for the control of their performance.

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The Amorphous Fe83Nd13B4 Alloy Crystallization Kinetics and High Coercivity State Formation

Cited by 20 publications

References 6 publications

Uncoupled surface spin induced exchange bias in α-MnO2 nanowires

Uncoupled surface spin induced exchange bias in α-MnO2 nanowires

Magnetic properties of Mn substituted Nd–Fe–B composite

Ferric Phosphate Hydroxide Microstructures Affect Their Magnetic Properties

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