Crystallization of Co100-x
              Pt
                x
              B10Si12 amorphous metallic alloys

Yoo, Chung-Sik; Lim, Sang-Kyu; Yoon, Chong Seung; Kim, C. K.

doi:10.1007/s11661-004-0154-0

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…1-3, it can be concluded that, like other Co-rich amorphous alloys [3,7,8], Co 48 Mn 20 Ge 10 B 10 Si 12 devitrified through a primary crystallization, in which metal-rich crys- talline phases first nucleated, followed by eutectic reaction triggered by the metalloid enrichment of the matrix [9]. This amorphous alloy, however, unlike other Co-rich compositions, showed a substantial irreversible change in magnetic properties when annealed below the crystallization temperature.…”

Section: Resultsmentioning

confidence: 89%

Crystallization and structural relaxation of Co48Mn20Ge10B10Si12 amorphous alloy

Hwang

Chun

et al. 2006

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 89%

Crystallization and structural relaxation of Co48Mn20Ge10B10Si12 amorphous alloy

Hwang

Chun

et al. 2006

Journal of Alloys and Compounds

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“…% B in their initial composition, therefore they obtained an initially amorphous as-cast state and the L1 0 phase has been obtained only after subsequent annealing. The good hard magnetic properties are considered to be due to exchange magnetic coupling between nanoscale hard face-centered-tetragonal and soft face-centered-cubic magnetic phases [24].In Co-rich alloys with low Pt concentration, Yoo et al [25] have studied crystallization behavior and magnetic properties of the (Co,Pt)-B-Si system as a function of Pt content. However, no L1 0 phase has been obtained due to low Pt concentration in that alloy and amorphous as-cast state was obtained due to the presence of two glass-forming elements (B and Si) with an abundance of 22 at.…”

mentioning

confidence: 99%

“…In Co-rich alloys with low Pt concentration, Yoo et al [25] have studied crystallization behavior and magnetic properties of the (Co,Pt)-B-Si system as a function of Pt content. However, no L1 0 phase has been obtained due to low Pt concentration in that alloy and amorphous as-cast state was obtained due to the presence of two glass-forming elements (B and Si) with an abundance of 22 at.…”

mentioning

confidence: 99%

Annealing-Induced High Ordering and Coercivity in Novel L10 CoPt-Based Nanocomposite Magnets

Crisan

Vasiliu

Mercioniu

et al. 2018

Metals

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A novel class of quaternary intermetallic alloys based on CoPt is investigated in view of their interesting magnetic properties induced by the presence of hard magnetic L1 0 phase. A Co 48 Pt 28 Ag 6 B 18 alloy has been prepared by rapid solidification from the melt and subjected to various isothermal annealing procedures. The structure and magnetism of both as-cast and annealed samples as well as the phase evolution with temperature are investigated by means of thermal analysis, X-ray, and selected area electron diffraction, scanning and high-resolution electron microscopy, and magnetic measurements. The X-ray diffraction (XRD) analysis shows that both the as-cast alloy and the sample annealed at 400 • C (673 K) have a nanocrystalline structure where fcc CoPt phase predominates. Annealing at 473 • C promotes the formation of L1 0 phase triggered by the disorder-order phase transformation as documented in the differential scanning calorimetry results. The sample annealed at 670 • C (943 K) shows full formation of L1 0 CoPt as revealed by XRD. Magnetic measurements showed coercivity values ten times increased compared to the as-cast state. This confirms the full formation of L1 0 CoPt in the annealed samples. Moreover, detailed atomic resolution HREM images and SAED patterns show the occurrence of the rarely seen (003) superlattice peaks, which translated into a high ordering of the L1 0 CoPt superlattice. Such results spur more interest in finding novel classes of nanocomposite magnets based on L1 0 phase.at 675 • C (948 K) does the disorder-order phase transformation take place in CoPt and the strong remanence enhancement effect is due to the multiple phase character of the samples, as it originates from exchange coupling between the face-centered-tetragonal (fct)-ordered hard magnetic phase and the face-centered-cubic (fcc)-disordered soft magnetic matrix.The high ordering temperature is regarded as an obstacle for future utilization of such alloys as the next class of nanocomposite magnets. However, a reduction of the ordering temperature required for L1 0 phase formation can be obtained via suitable modulation of the stoichiometry, for example by adding other elements to the composition. In the case of the FePt system, noble metals such as Au, Ag or Nb have been considered as suitable additions, having the role of promoting early ordering by segregation to the (Fe,Co)Pt grain boundaries [7][8][9][10][11][12][13][14] while a glass-forming element such as boron has been added to FePt to allow synthesis by out-of-equilibrium techniques such as rapid solidification from the melt [15][16][17][18][19][20][21].Chang et al. [22] have studied the effect of Co substitution on the magnetic properties of melt-spun (Fe,Co)-Pt-B nanocomposite ribbons and found that Co substitution enhances the coercivity and energy product due to the formation of ordered L1 0 -(Fe,Co)Pt phase with higher anisotropy field. Makino et al. [23] obtained the crystalline ordered L1 0 -FePt phase, with high coercivity, directly formed by rapid q...

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Growth and characterization of FeB nanoparticles for potential application as magnetic resonance imaging contrast agent

Oprea¹,

Martínez²,

Román³

et al. 2014

Mater. Res. Express

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Crystallization of Co100-x Pt x B10Si12 amorphous metallic alloys

Cited by 3 publications

References 12 publications

Crystallization and structural relaxation of Co48Mn20Ge10B10Si12 amorphous alloy

Crystallization and structural relaxation of Co48Mn20Ge10B10Si12 amorphous alloy

Annealing-Induced High Ordering and Coercivity in Novel L10 CoPt-Based Nanocomposite Magnets

Growth and characterization of FeB nanoparticles for potential application as magnetic resonance imaging contrast agent

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