Crystallization processes in Fe–Pt–Nb–B melt spun ribbons

Crisan, A.; Crisan, O.; Randrianantoandro, N.; Văleanu, M.; Morariu, M.; Burkel, E.

doi:10.1016/j.msec.2006.08.031

Cited by 19 publications

(11 citation statements)

References 3 publications

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“…The as-cast ribbons are obtained in amorphous state, as checked by powder XRD and Mossbauer spectroscopy, results that are shown elsewhere [9]. In order to follow the crystallization processes occurring in the sample, differential scanning calorimetry was performed.…”

Section: Resultsmentioning

confidence: 97%

Crystallization processes and phase evolution in amorphous Fe–Pt–Nb–B alloys

Crisan

Randrianantoandro

et al. 2007

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 97%

Crystallization processes and phase evolution in amorphous Fe–Pt–Nb–B alloys

Crisan

Randrianantoandro

et al. 2007

Journal of Alloys and Compounds

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“…Various chemical and physical synthesis methods, such as thermal decomposition using high-temperature boiling point solvents [ 7 ], polyol [ 8 ], microemulsions [ 9 ], microwave processing [ 10 ], sonochemistry [ 11 ], pulsed plasma in liquid [ 12 ], or inert gas condensation [ 13 ], have been used to obtain FePt nanoparticles with well-defined shape and controllable sizes. Various other reports deal with the specific link between synthesis methods and magnetic performances in a large range of magnetic materials [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. As a building block for various devices, FePt is also of interest.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Phase Coexistence and Hard–Soft Exchange Coupling in FePt Nanocomposite Magnets

et al. 2020

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With the aim of demonstrating phase coexistence of two magnetic phases in an intermediate annealing regime and obtaining highly coercive FePt nanocomposite magnets, two alloys of slightly off-equiatomic composition of a binary Fe-Pt system were prepared by dynamic rotation switching and ball milling. The alloys, with a composition Fe53Pt47 and Fe55Pt45, were subsequently annealed at 400 °C and 550 °C and structurally and magnetically characterized by means of X-ray diffraction, 57Fe Mössbauer spectrometry and Superconducting Quantum Interference Device (SQUID) magnetometry measurements. Gradual disorder–order phase transformation and temperature-dependent evolution of the phase structure were monitored using X-ray diffraction of synchrotron radiation. It was shown that for annealing temperatures as low as 400 °C, a predominant, highly ordered L10 phase is formed in both alloys, coexisting with a cubic L12 soft magnetic FePt phase. The coexistence of the two phases is evidenced through all the investigating techniques that we employed. SQUID magnetometry hysteresis loops of samples annealed at 400 °C exhibit inflection points that witness the coexistence of the soft and hard magnetic phases and high values of coercivity and remanence are obtained. For the samples annealed at 500 °C, the hysteresis loops are continuous, without inflection points, witnessing complete exchange coupling of the hard and soft magnetic phases and further enhancement of the coercive field. Maximum energy products comparable with values of current permanent magnets are found for both samples for annealing temperatures as low as 500 °C. These findings demonstrate an interesting method to obtain rare earth-free permanent nanocomposite magnets with hard–soft exchange-coupled magnetic phases.

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“…Pt. The precursor for obtaining magnetically hard materials are rapid-cooled tapes, usually with an amorphous structure [7][8][9][10][11][12]. As a result of heat treatment of the amorphous tapes, single-phase or polinary phase alloys rich in different crystalline phases based on Fe, Pt and other metals can be obtained [13][14][15][16][17][18][19][20][21][22][23][24].…”

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confidence: 99%

“…In FeCoB alloys with the addition of Pt, ordered and unordered phases can be created with face-centeredcubic symmetries (fcc = A1 and L1 2 ) and ordered phases with face-centered-tetragonal symmetry (fct = L1 0 ) with high uniaxial mgnetocrystalline anisotropy (7 MJ/m 3 ) [7].…”

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confidence: 99%

Magnetic Properties of FeCoWYB-based Ferromagnetic Alloys with a Small Addition of Pt

Pietrusiewicz¹

2019

Rev. Chim.

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The paper presents the results of research on the effect of Pt addition in the amount of 2 to 3% at. in to bulk Fe61Co10B20Y8-xW1Ptx alloy on its structure and magnetic properties. Alloys in the form of tiles were made by pressing a liquid alloy into a copper liquid-cooled mold. Structural examinations were carried out using X-ray diffraction (XRD). The magnetic properties were examined using a vibration magnetometer (VSM). Based on structural investigations, the occurrence of crystalline phases, i.e.: a-Fe, Fe2B, FePt, Fe3Pt, FePt3, was found. The results of VSM tests showed that both saturation magnetization (m0Ms) and coercive field (Hc) significantly increased. The study showed that even a small change in the Pt content in the alloy affects its structure and thus significantly affects the magnetic properties.

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Crystallization processes in Fe–Pt–Nb–B melt spun ribbons

Cited by 19 publications

References 3 publications

Crystallization processes and phase evolution in amorphous Fe–Pt–Nb–B alloys

Crystallization processes and phase evolution in amorphous Fe–Pt–Nb–B alloys

Magnetic Phase Coexistence and Hard–Soft Exchange Coupling in FePt Nanocomposite Magnets

Magnetic Properties of FeCoWYB-based Ferromagnetic Alloys with a Small Addition of Pt

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