The effect of particle size on coercivity and crystallinity of SmCo5

Chen, Christina; Knutson, S. J.; Shen, Y.; Wheeler, R.; Horwath, J.; Barnes, Paul N.

doi:10.1063/1.3607958

Cited by 51 publications

(30 citation statements)

References 16 publications

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“…The atomic radius of Sm (180 pm) is larger than that of Co (125 pm). Therefore, the V of SmCo 5 continuously expands with the increase in Sm content, which verifies the existence of the high-temperature homogeneity range for SmCo 5 . A similar tendency of change of lattice parameters with the variation of Sm content was observed in sintered SmCo 5 magnets [16,17].…”

Section: Experimental Methodsmentioning

confidence: 93%

“…Surfactant-assisted ball milling (SABM) and melt-spinning techniques are usually used to improve coercivity by decreasing grain size and developing c-axis texture. High coercivities of about 20 kOe were easily obtained for the anisotropic SmCo 5 nanoflakes by SABM [4][5][6][7]. However, some issues such as particle contamination, oxidation, wide size distribution, and complete removal of the surfactant limit the practical application of anisotropic SABM SmCo 5 nanoflakes.…”

Section: Introductionmentioning

confidence: 99%

“…However, some issues such as particle contamination, oxidation, wide size distribution, and complete removal of the surfactant limit the practical application of anisotropic SABM SmCo 5 nanoflakes. These problems are almost nonexistent for melt-spun SmCo 5 ribbons.…”

Section: Introductionmentioning

confidence: 99%

“…SmCo 5 materials are excellent candidates for high-temperature permanent magnets. Generally, the arc-and induction-melted SmCo 5 ingots have a very low coercivity because of large grain size (much larger than the critical single-domain size of 1.7 μm) and crystallographic isotropy. Surfactant-assisted ball milling (SABM) and melt-spinning techniques are usually used to improve coercivity by decreasing grain size and developing c-axis texture.…”

Section: Introductionmentioning

confidence: 99%

“…SmCo 5 , which crystallizes in the CaCu 5 structure, has attracted much attention due to its giant magnetocrystalline anisotropy and high Curie temperature [1][2][3]. SmCo 5 materials are excellent candidates for high-temperature permanent magnets.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Sm content on energy product of rapidly quenched and oriented SmCo5 ribbons

Zhang

Valloppilly

2014

Appl. Phys. A

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The Sm-content dependence of phase composition, anisotropy, and other magnetic properties of Sm 1+δ Co 5 (δ ≤ 0.12) ribbons melt spun at 10 m/s has been studied. The samples consist of hexagonal SmCo 5 grains whose c axes are preferentially aligned along the long direction of the ribbon. The lattice parameter a and the cell volume (V) increase with increasing Sm content δ, whereas c decreases. Sm addition appears to improve the degree of the preferred orientation of the c-axis and to increase the mean grain size, which weakens the effective intergranular exchange coupling. Therefore, the remanence ratio, coercivity, and squareness of the hysteresis loops are significantly enhanced. The remanence ratio of 0.91 and the maximum energy product of 21.2 MGOe, which is the highest value reported so far for Sm-Co ribbons, are achieved for δ = 0.06. High performance in combination with simple processing may facilitate high-temperature applications for anisotropic Sm 1+δ Co 5 ribbons.

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Section: Experimental Methodsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of Sm content on energy product of rapidly quenched and oriented SmCo5 ribbons

Zhang

Valloppilly

2014

Appl. Phys. A

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Novel Nanostructured Rare‐Earth‐Free Magnetic Materials with High Energy Products

et al. 2013

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The development of new iron-or cobalt-rich permanent-magnet materials is of paramount importance in materials science and technology since high-performance materials based on Nd2Fe14B or FePt are extremely expensive or subject to limited rare-earth supplies. [1][2][3][4] Aside from phase-diagram considerations, this requires alloys with high magnetocrystalline anisotropy K1 and Curie temperature Tc. However, the range of alternative compounds with appreciable K1 and high Tc is limited, and the situation is often aggravated by their metastable nature and by the requirement of high-formation temperatures. [5][6][7][8][9][10][11][12] For example, two suitable candidates are Zr2Co11 and HfCo7, both crystallizing in noncubic structures, as necessary for high K1. However, the poor control over phase purity in traditionally prepared bulk alloys has an adverse effect on permanent magnetic properties. [7,8,11,12] The future development requires high-performance magnetic materials for applications ranging from home appliances to sophisticated microelectronics and environment-friendly technologies, such as hybrid vehicles and wind turbines. [1][2][3][4] Synthesis of magnetic materials in the form of nanoparticles smaller than 10 nm has emerged as an alternative method to stabilize traditional or new crystal structures. [13][14][15][16][17] Small nanoparticles having high anisotropies also are essential as building blocks for highenergy nanocomposite magnets to ensure effective exchange coupling. [17][18][19][20][21] Wet-chemical and conventional physical vapor-deposition methods often require annealing at high temperatures to obtain the desired high-anisotropy crystal structures. In fact, this annealing step has been an important issue in controlling the size-distribution, self-assembly, easyaxis alignment, and nanostructure, not only in permanent magnetism but also in magnetic recording and other areas. [17][18][19][21][22][23][24][25] Easy-axis alignment of nanoparticles is particularly important to obtain high-energy products in permanent magnets because the energy product is quadratic in the magnetization. The annealing process and the associated sintering can be avoided by fabricating directly ordered nanoparticles using nonequilibrium cluster deposition, and this method can also be used to align the easy axes prior to deposition. [14][15][16] Here we show the fabrication of novel Zr2Co11 permanent-magnet nanostructures in a single-step process using cluster-deposition method. Our structures are free of rare-earths and expensive Pt and exhibit record energy products for this class of materials.A Zr-Co composite target of the required stoichiometry is sputtered using a directcurrent magnetron discharge into a water-cooled gas-aggregation chamber. [15,16,26] The sputtered atoms gain sufficient energy via collisions with ions to form nanoparticles with high-anisotropy structures in the gas-aggregation chamber before deposition on substrates kept at room temperature in the deposition chamber. The Zr2Co11 nanoparticles are...

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1.1.3.1 RCo5 (s = 0)

Djéga‐Mariadassou

2013

Nanocrystalline Materials, Part A

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The effect of particle size on coercivity and crystallinity of SmCo5

Cited by 51 publications

References 16 publications

Effect of Sm content on energy product of rapidly quenched and oriented SmCo5 ribbons

Effect of Sm content on energy product of rapidly quenched and oriented SmCo5 ribbons

Novel Nanostructured Rare‐Earth‐Free Magnetic Materials with High Energy Products

1.1.3.1 RCo5 (s = 0)

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