Magnetization reversal in textured NdFeB–Fe composites observed by domain imaging

Thielsch, Juliane; Hinz, Dietrich; Schultz, L.; Gutfleisch, Oliver

doi:10.1016/j.jmmm.2010.05.064

Cited by 18 publications

(4 citation statements)

References 18 publications

(29 reference statements)

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“…Hot deformation is an effective way to induce texture in NdFeB single-phase magnets based on the minor Nd-rich liquid phase along the grain boundaries [207][208][209][210][211][212][213][214][215][216][217][218]. Recently, several attempts have been made for preparation of anisotropic nanocomposites magnets by hot deformation [219][220][221][222][223][224][225][226][227][228][229]. For example, Lee et al [222] reported the hot deformed bulk anisotropic composite Nd 13.5 Fe 80 Ga 0.5 B 6 /α-Fe and Nd 14 Fe 79.5 Ga 0.5 B 6 /Fe-Co magnets by blending a Nd-rich Nd-Fe-Ga-B powder with an α-Fe or Fe-Co powder followed by hot compaction at 600-700 • C and hot deformation at 850-950 • C. The composite Nd 13.5 Fe 80 Ga 0.5 B 6 /α-Fe and Nd 14 Fe 79.5 Ga 0.5 B 6 /Fe-Co magnets had microstructures consisting of a very large soft phase up to ∼50 µm; however, smooth demagnetization curves and (BH) max up to 50 MG Oe were reported.…”

Section: Anisotropic Nanostructured Bulk Magnetsmentioning

confidence: 99%

Advances in nanostructured permanent magnets research

Poudyal¹,

Liu²

2012

J. Phys. D: Appl. Phys.

248

142

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This paper reviews recent developments in research in nanostructured permanent magnets (hard magnetic materials) with emphasis on bottom-up approaches to fabrication of hard/soft nanocomposite bulk magnets. Theoretical and experimental findings on the effects of soft phase and interface conditions on interphase exchange interactions are given. Synthesis techniques for hard magnetic nanoparticles, including chemical solution methods, surfactant-assisted ball milling and other physical deposition methods are reviewed. Processing and magnetic properties of warm compacted and plastically deformed bulk magnets with nanocrystalline morphology are discussed. Prospects of producing bulk anisotropic hard/soft nanocomposite magnets are presented.

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Section: Anisotropic Nanostructured Bulk Magnetsmentioning

confidence: 99%

Advances in nanostructured permanent magnets research

Poudyal¹,

Liu²

2012

J. Phys. D: Appl. Phys.

248

142

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“…In hot-deformed samples, the grains are mainly platelet shaped with lateral dimensions of approximately 400 nm Â 100 nm. 1,2 These particular magnets exhibit interaction domains [1][2][3][4][5][6][7][8][9] which is a collective phenomenon, i.e., each interaction domain encompasses many grains instead of each grain containing many magnetic domains, as in, e.g., sintered magnets. Even though interaction domains have been under investigation, important aspects are not yet understood.…”

Section: Introductionmentioning

confidence: 99%

Dependence of coercivity on length ratios in sub-micron Nd2Fe14B particles with rectangular prism shape

Thielsch

Suess

Schultz

et al. 2013

Journal of Applied Physics

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Demagnetization curves of sub-micron Nd 2 Fe 14 B particles with rectangular prism shapes were simulated by micromagnetic simulations. Coercivity decreases with increasing particle thickness for same particle volumes. This unexpected behavior can be explained by different resulting angles of the total effective field when superimposing the applied field vector with the stray field vector at the point of the first reversal event. The angular dependence of the nucleation field follows a Stoner-Wohlfarth like behavior. V

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“…In order to further investigate the mechanism of coercivity enhancement, the Kerr microscope was used for domain observation in high magnetic fields [16][17][18]. The change of microstructure with PrNd nanoparticles addition is also realized from the microscope image in Fig.…”

Section: Resultsmentioning

confidence: 99%

Recycling of Sintered Nd-Fe-B Magnets Doped with PrNd Nanoparticles

Zhang¹,

Liu²,

Li³

et al. 2015

Journal of Magnetics

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The waste of sintered Nd-Fe-B magnets was recycled using the method of dopingPrNd nanoparticles. The effect of PrNd nanoparticle doping on the magnetic properties of the regenerated magnets has been studied. As the content of the PrNd nanoparticles increases, the coercivity increases monotonically, whereas both the remanence and the maximum energy products reach the maximum values for 4 wt% PrNd doping. Microstructural observation reveals that the appropriate addition of PrNd nanoparticles improves the magnetic properties and refines the grain. Domain investigation shows that the self-pinning effect of the rare earth (Re)-rich phase is enhanced by PrNd nano-particle doping. Compared to the magnet with 4 wt% PrNd alloy prepared using the dual-alloy method, the regenerated magnet doped with the same number of PrNd nanoparticles exhibits better magnetic properties and a more homogeneous microstructure. Therefore, it is concluded that PrNd nanoparticle doping is an efficient method for recycling the leftover scraps of Nd-Fe-B magnets.

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Magnetization reversal in textured NdFeB–Fe composites observed by domain imaging

Cited by 18 publications

References 18 publications

Advances in nanostructured permanent magnets research

Advances in nanostructured permanent magnets research

Dependence of coercivity on length ratios in sub-micron Nd2Fe14B particles with rectangular prism shape

Recycling of Sintered Nd-Fe-B Magnets Doped with PrNd Nanoparticles

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