Effects of cobalt addition on microstructure and magnetic properties of PrNdFeB/Fe 7 Co 3 nanocomposite

Ding, He-Wei; Cui, Chunxiang; Yang, Wei; Sun, Ji-Bing

doi:10.1016/s1002-0721(17)60935-9

Cited by 10 publications

(3 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The generation of the hard magnetic phase Nd 2 (Fe, Co) 14 B with a high anisotropy field hinders the nucleation of the magnetization reversal domain nucleus and the rotation of the magnetic domain, thereby enhancing the coercivity. At the same time, according to the XRD results and Formula (8) [ 31 , 32 ]:

The content of the hard magnetic Nd2(Fe, Co)14B phase in Nd-Fe-B/Fe-Co composite nanowires prepared via alternating electrodeposition can be calculated as a volume fraction of 0.81, which is significantly higher than that of the hard magnetic phase Nd2Fe14B (volume fraction of 0.73) in Nd-Fe-B nanowires. This is due to the presence of Co ions in the alternating deposition process, which promotes more Nd ions in the electrolyte to be pulled into the AAO template and induces co-deposition, increasing the deposition quantity of Nd atoms and providing favorable conditions for the subsequent generation of a greater amount of hard magnetic phases.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Study on the Microstructure and Magnetic Properties of Nd-Fe-B/Fe-Co Composite Nanowires

et al. 2023

Self Cite

View full text Add to dashboard Cite

To solve the problem of the low coercivity of Nd-Fe-B-based nanowires impeding their application in magnetic storage media, highly ordered Nd-Fe-B/Fe-Co composite nanowires were fabricated in an anodic alumina template by means of the alternating electrochemical deposition method. In this paper, the effect of soft and hard magnetic phase compositing on the magnetic properties of Nd-Fe-B-based nanowires was investigated, and the coercivity improvement mechanism was demonstrated. The results show that after annealing at 600 °C for 2 h, Nd-Fe-B/Fe-Co nanowires crystallize into a multiphase structure containing a hard Nd2(Fe, Co)14B phase and soft NdB4, NdB6, Fe7Nd, and Fe7Co3 phases. It is characterized that the Nd2(Fe, Co)14B phase preferentially nucleates, followed by NdB4 + NdB6 + Fe7Nd, while Fe7Co3 has been formed in as-deposited nanowires. The existence of a Nd2(Fe, Co)14B phase with high anisotropy fields, the remanence enhancement effect produced by exchange coupling between hard–soft magnetic phases, and the pinning effect between different phases make the composite nanowires approximately exhibit single hard magnetic phase characteristics with coercivity and remanence ratio as high as 4203.25 Oe and 0.89. The results indicate that synthesizing Nd-Fe-B/Fe-Co exchange-coupled composite nanowires via alternating electrodeposition is an effective way to optimize the magnetic performance of Nd-Fe-B-based nanowires.

show abstract

Section: Resultsmentioning

confidence: 99%

…”

Section: Resultsmentioning

confidence: 99%

Study on the Microstructure and Magnetic Properties of Nd-Fe-B/Fe-Co Composite Nanowires

et al. 2023

Self Cite

View full text Add to dashboard Cite

show abstract

“…The ribbon surfaces appear smooth and to be single phase, which is consistent with the XRD results. When compared to the Tb-free alloy [15,16], Tb addition promotes the formation of amorphous phases. Amorphous alloys devoid of atomic long range order and crystalline defects are characterized by excellent soft magnetic properties [17].…”

Section: Methodsmentioning

confidence: 99%

The effect of Tb doping on the magnetic properties and microstructure of a TbNdFeCoB/Fe₇Co₃ nanocomposite permanent magnet

Ding

Cui

Yang

et al. 2020

Mater. Res. Express

Self Cite

View full text Add to dashboard Cite

Melt-spun NdFeB-type nanocomposite magnetic materials are important in a number of applications, including electromagnetic sensors, magnetic resonance imaging, and voice coil motors. Herein we investigated the magnetic properties and microstructures of melt-spun Tb x Nd 10−x Fe 80 Co 4 B 6 /Fe 7 Co 3 (x=0.1, 0.2, and 0.3) ribbons by means of x-ray diffractometry, scanning electron microscopy, and magnetization experiments. Tb doping resulted in the formation of a 2:14:1 phase with a higher anisotropy field, which suppressed the separation of Fe 7 Co 3 branch crystals and improved the magnetic properties of the material. Optimum magnetic properties that include a remanence (J r ) of 0.62 T, a coercivity (H ci ) of 612.0 kA m −1 , and a maximum magnetic energy product ((BH) max ) of 94.9 kJ m −3 were obtained for the annealed Tb 0.3 Nd 9.7 Fe 80 Co 4 B 6 /Fe 7 Co 3 ribbon. Furthermore, the effective anisotropy constant, K , eff and the saturation magnetization, Ms, in the nanocomposite were determined by the LATS (law of approach to saturation) method. In this study, the values of K eff and Ms were found to lie between those of hard and soft magnetic phases, consistent with the exchangecoupling concept.

show abstract

Ti‐Doped Nanocomposite Pr₂Fe₁₄B/α‐Fe Ribbons with High Coercivity

Alam,

Raza,

Han

et al. 2023

Physica Status Solidi (a)

View full text Add to dashboard Cite

Nanocomposite permanent magnetic alloys are prepared by the melt‐spinning technique with wheel speed ranging from 21 to 33 ms−1. X‐ray diffraction results show that the as‐spun ribbon is rich of soft α‐Fe, hard Pr2Fe14B magnetic phases, and no other metastable phases are found in our alloy ribbon. Initial magnetization curves reveal that the coercivity mechanism of the ribbons vary with the content of Ti. For x = 2, coercivity is mainly determined by pure pinning; while for x = 1, 3, and 4, it is mainly controlled by the mixture of nucleation of domain and localized pinning at grain boundaries. The coercivity value of 1026 kA m−1, the highest value reported so far, is mainly generated from a pure pinning mechanism in the ribbon with x = 2. The recoil permeability shows a minimum value range from to for x = 2 alloy, suggesting strong exchange coupling between the magnetic grains and then leading to the concurrent reversal of soft and hard phase grains during the demagnetization process. The Henkel plots demonstrate only exchange interaction for x = 1 and exchange interaction with slightly magnetostatic interaction for x = 2, 3, and 4. The exchange interaction exhibits maximum strength for x = 2, which is the reason for high coercivity.

show abstract

Effects of cobalt addition on microstructure and magnetic properties of PrNdFeB/Fe 7 Co 3 nanocomposite

Cited by 10 publications

References 24 publications

Study on the Microstructure and Magnetic Properties of Nd-Fe-B/Fe-Co Composite Nanowires

Study on the Microstructure and Magnetic Properties of Nd-Fe-B/Fe-Co Composite Nanowires

The effect of Tb doping on the magnetic properties and microstructure of a TbNdFeCoB/Fe₇Co₃ nanocomposite permanent magnet

Ti‐Doped Nanocomposite Pr₂Fe₁₄B/α‐Fe Ribbons with High Coercivity

Contact Info

Product

Resources

About

Effects of cobalt addition on microstructure and magnetic properties of PrNdFeB/Fe 7 Co 3 nanocomposite

Cited by 10 publications

References 24 publications

Study on the Microstructure and Magnetic Properties of Nd-Fe-B/Fe-Co Composite Nanowires

Study on the Microstructure and Magnetic Properties of Nd-Fe-B/Fe-Co Composite Nanowires

The effect of Tb doping on the magnetic properties and microstructure of a TbNdFeCoB/Fe7Co3 nanocomposite permanent magnet

Ti‐Doped Nanocomposite Pr2Fe14B/α‐Fe Ribbons with High Coercivity

Contact Info

Product

Resources

About

The effect of Tb doping on the magnetic properties and microstructure of a TbNdFeCoB/Fe₇Co₃ nanocomposite permanent magnet

Ti‐Doped Nanocomposite Pr₂Fe₁₄B/α‐Fe Ribbons with High Coercivity