Microstructural changes during the slow-cooling annealing of nanocrystalline SmCo 2:17 type magnets

Romero, S.A.; Campos, Marcos Flávio de; Castro, José Adilson de; Moreira, Adir José; Landgraf, Fernando José Gomes

doi:10.1016/j.jallcom.2012.08.131

Cited by 26 publications

(19 citation statements)

References 35 publications

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“…7. As the predicted recoil curves are near the experimentally observed for 2:17 type SmCo magnets [9], this implies that the coercivity mechanism is coherent rotation for these magnets, as already noted before [2,3].…”

Section: Model For Recoil Curves Of Hysteresissupporting

confidence: 84%

“…In the high coercivity SmCo 2:17 magnets, there is formation of a copper-rich paramagnetic Sm(Cu,Co) 5 cell phase surrounding the Sm 2 (CoFe) 17 nanocrystalline grains [3]. The copper-rich cell avoids interaction between the particles, and a behavior near that predicted by the SW model can be observed [2,3].…”

Section: Model For Recoil Curves Of Hysteresismentioning

confidence: 97%

“…A very important assumption is monodomain particles. High coercivity Sm 2 Co 17 type magnets (5 element alloy Sm-Co-Cu-Fe-Zr) have shown behavior close to the SW prediction [2,3]. Here, it is briefly discussed how to predict recoil curves for anisotropic Stoner-Wohlfarth magnets [4,5].…”

Section: Introductionmentioning

confidence: 94%

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Predicting Recoil Curves in Stoner-Wohlfarth Anisotropic Magnets

Campos

Castro

2019

Acta Phys. Pol. A

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It is possible to predict recoil curves in magnetic materials following the Stoner-Wohlfarth behavior. In the presented example, the shapes of recoil curves are predicted for anisotropic Stoner-Wohlfarth magnets, which follow distribution of type f = cos n (α), with n = 15. As the predicted recoil curves are near the experimentally observed ones for SmCoCuFeZr magnets, this implies that the coercivity mechanism is coherent rotation for these magnets.

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Section: Model For Recoil Curves Of Hysteresissupporting

confidence: 84%

Section: Model For Recoil Curves Of Hysteresismentioning

confidence: 97%

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Predicting Recoil Curves in Stoner-Wohlfarth Anisotropic Magnets

Campos

Castro

2019

Acta Phys. Pol. A

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“…By comparing the simulated image with the experimental one, a perfect match was found regarding the atomic intensities within both images showing that only the Sm1 (6c) position is replaced by Zr. Indications of this behavior were suggested by X-ray measurements before 33 , 34 . The Sm2 (3a) position is still occupied by a Sm atom.…”

Section: Resultsmentioning

confidence: 83%

Atomic structure and domain wall pinning in samarium-cobalt-based permanent magnets

et al. 2017

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A higher saturation magnetization obtained by an increased iron content is essential for yielding larger energy products in rare-earth Sm2Co17-type pinning-controlled permanent magnets. These are of importance for high-temperature industrial applications due to their intrinsic corrosion resistance and temperature stability. Here we present model magnets with an increased iron content based on a unique nanostructure and -chemical modification route using Fe, Cu, and Zr as dopants. The iron content controls the formation of a diamond-shaped cellular structure that dominates the density and strength of the domain wall pinning sites and thus the coercivity. Using ultra-high-resolution experimental and theoretical methods, we revealed the atomic structure of the single phases present and established a direct correlation to the macroscopic magnetic properties. With further development, this knowledge can be applied to produce samarium cobalt permanent magnets with improved magnetic performance.

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“…[7][8][9] Especially, the nanocrystalline 1:7-type SmCo compounds prepared by spark plasma sintering method exhibit the highest coercivity of 2.9 T at room temperature (RT), while only 0.5 T at 500 C. 10 On the other hand, 2:17-type SmCo magnets are considered to be the most potential high temperature magnets, which were mainly prepared by powder metallurgy. [11][12][13] The 2:17-type SmCo high temperature magnets with low Sm content showed the highest intrinsic coercivity of 1.0 T at 500 C, while only 1.16 T at room temperature. The 2:17-type SmCo high temperature magnets with high Sm content exhibited the intrinsic coercivity of 2.5 T at room temperature, but only 0.8 T at 500 C. 14 Single crystal growth is promising for preparing 2:17-type SmCo high temperature magnets with complete orientation and full density, overcoming the relatively low orientation and density of the magnets by powder metallurgy.…”

mentioning

confidence: 95%