High performance Co–Zr–B melt-spun ribbons

Saito, Tetsuji

doi:10.1063/1.1565694

Cited by 59 publications

(30 citation statements)

References 11 publications

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“…In the XRD analysis [29], the intensity of the crystalline peaks becomes weaker and broader as the boron content increases, indicating the reduction of the crystalline size in the samples. Amorphous and partially crystalline alloys have also been observed in this system [2,31].…”

Section: Resultsmentioning

confidence: 99%

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Structures and magnetic properties of Co-Zr-B magnets studied by first-principles calculations

Zhao

Nguyen

et al. 2015

Journal of Applied Physics

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The structures and magnetic properties of the Co-Zr-B alloys near the Co 5 Zr composition were studied using adaptive genetic algorithm and first-principles calculations to guide further experimental effort on optimizing their magnetic performances. Through extensive structural searches, we constructed the contour maps of the energetics and magnetic moments of the Co-Zr-B magnet alloys as a function of composition. We found that the Co-Zr-B system exhibits the same structural motif as the "Co 11 Zr 2 " polymorphs, which plays a key role in achieving high coercivity. Boron atoms can either substitute selective cobalt atoms or occupy the interstitial sites. First-principles calculation shows that the magnetocrystalline anisotropy energies can be significantly improved through proper boron doping.

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Section: Resultsmentioning

confidence: 99%

“…The structure and glass formability in the Co-Zr-B alloy system have been studied experimentally [29][30][31]. In the XRD analysis [29], the intensity of the crystalline peaks becomes weaker and broader as the boron content increases, indicating the reduction of the crystalline size in the samples.…”

Section: Resultsmentioning

confidence: 99%

Structures and magnetic properties of Co-Zr-B magnets studied by first-principles calculations

Zhao

Nguyen

et al. 2015

Journal of Applied Physics

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“…[7] B addition was found to refine the grain size and increase the coercivity. [8] Ti addition suppressed the formation of Zr2Co11 dendrites upon solidification, refined the structure, and enhanced the coercivity. [9,10] A high coercivity of 6.7 kOe was achieved for the as-spun Zr2Co11-based nanocomposites with the additions of Si and B.…”

Section: Introductionmentioning

confidence: 99%

Effect of annealing on nanostructure and magnetic properties of Zr2Co11 material

Zhang

Valloppilly

et al. 2014

Materials Science and Engineering: B

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Single-phase Zr2Co11 nanomagnetic materials with high coercivity have been fabricated by melt spinning with subsequent annealing under Ar, N2, and vacuum. Annealing coarsens the grains and decreases the density of defects, leading to intergrain decoupling action and the enhancement of the magnetocrystalline anisotropy field of the hard magnetic phase. Therefore, coercivity increases 44.7% from 6.7 kOe for the as-spun to 9.7 kOe for the annealed, which is the highest among Zr-Co alloys so far. The results show that the magnetic-hardening mechanism is primarily dominated by domain-wall pinning. In addition, annealing clearly increases the saturation magnetization. The above results indicate that Zr2Co11 has potential for fabricating rare-earth-free permanent-magnet nanocomposites.

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“…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.…”

mentioning

confidence: 99%

“…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.…”

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confidence: 99%

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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High performance Co–Zr–B melt-spun ribbons

Cited by 59 publications

References 11 publications

Structures and magnetic properties of Co-Zr-B magnets studied by first-principles calculations

Structures and magnetic properties of Co-Zr-B magnets studied by first-principles calculations

Effect of annealing on nanostructure and magnetic properties of Zr2Co11 material

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

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