Hard magnetic properties of melt-spun Co82Zr18−xTix alloys

Hou, Zhipeng; Wang, Wenquan; Xu, Shifeng; Zhang, Jinbao; Wu, Chunji; Feng, Shouhua

doi:10.1016/j.physb.2011.09.138

Cited by 19 publications

(7 citation statements)

References 10 publications

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“…Metallic additives such as Ti, Si or Mo facilitate the formation of the hard-magnetic phase and decreases both the mean grain size and the amount of the soft Co phase. 5,[10][11][12] The addition of Si and B has a similar effect. 3 In particular, boron addition has been found to increase the coercivity of rapidly quenched Zr-Co materials, 13,14 but it is unclear how B addition affects the phase components and structural properties.…”

Section: Introductionmentioning

confidence: 87%

Effect of boron doping on nanostructure and magnetism of rapidly quenched Zr2Co11-based alloys

et al. 2016

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The role of B on the microstructure and magnetism of Zr16Co82.5-xMo1.5Bx ribbons prepared by arc melting and melt spinning is investigated. Microstructure analysis show that the ribbons consist of a hard-magnetic rhombohedral Zr2Co11 phase and a minor amount of soft-magnetic Co. We show that the addition of B increases the amount of hard-magnetic phase, reduces the amount of soft-magnetic Co and coarsens the grain size from about 35 nm to 110 nm. There is a monotonic increase in the volume of the rhombohedral Zr2Co11 unit cell with increasing B concentration. This is consistent with a previous theoretical prediction that B may occupy a special type of large interstitial sites, called interruption sites. The optimum magnetic properties, obtained for x = 1, are a saturation magnetization of 7.8 kG, a coercivity of 5.4 kOe, and a maximum energy product of 4.1 MGOe.

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Section: Introductionmentioning

confidence: 87%

Effect of boron doping on nanostructure and magnetism of rapidly quenched Zr2Co11-based alloys

et al. 2016

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“…Substitution of other metals like Mo and Ti has been explored, and found to produce energy products near 3 MGOe in melt-spun materials. [17][18][19] Zr-Co-B alloys have shown intrinsic coercive fields greater than 4 kOe and energy products near 5 MGOe. 20,21 We have begun investigating the magnetic properties of materials based on Hf 2 Co 11 .…”

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confidence: 99%

Hard ferromagnetism in melt-spun Hf2Co11B alloys

McGuire

Rios

Ghimire

et al. 2012

Applied Physics Letters

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“…However, in practice it is found that standard processing methods lead to the formation of secondary phases such as Co and Zr6Co23 having low magnetocrystalline anisotropies during the cooling process. [7][8][9]11,12] The cluster-deposited ZrxCo100-x nanoparticles not only form in the highanisotropy rhombohedral Zr2Co11 structure for x ≈ 15.4 without high-temperature annealing, but they also exhibit a predominant Zr2Co11 phase for a rather broad composition region (13.5 ≤ × ≤ 16.3), as indicated by green dotted vertical lines in figure 2b. This phase structure is also supported by magnetic measurements.…”

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confidence: 99%

“…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.…”

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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%

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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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Hard magnetic properties of melt-spun Co82Zr18−xTix alloys

Cited by 19 publications

References 10 publications

Effect of boron doping on nanostructure and magnetism of rapidly quenched Zr2Co11-based alloys

Effect of boron doping on nanostructure and magnetism of rapidly quenched Zr2Co11-based alloys

Hard ferromagnetism in melt-spun Hf2Co11B alloys

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

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