Hard and semi-hard Fe-based magnetic materials

Mohapatra, Jeotikanta; Liu, Xubo; Joshi, Pramanand; Liu, J. Ping

doi:10.1016/j.jallcom.2023.170258

Cited by 10 publications

(4 citation statements)

References 152 publications

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“…Furthermore, due to their uniaxial shape anisotropy and easy magnetization axis along the long axis, rod-shaped geometry is seen as a superior contender for device applications [32,33]. Besides, the shape of a particle determines the easy and hard axes of magnetization by modulating the magnetic anisotropy constant, which could design a nanoparticle as a soft or hard permanent magnet [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Magnetic and electronic properties of anisotropic magnetite nanoparticles

Mitra,

Mohapatra,

Aslam

2024

Mater. Res. Express

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Magnetic materials at the nanometer scale can demonstrate highly tunable properties as a result of their reduced dimensionality. While significant advancements have been made in the production of magnetic oxide nanoparticles over the past decades, maintaining the magnetic and electronic phase stabilities in the nanoscale regime continues to pose a critical challenge. Finite-size effects modify or even eliminate the strongly correlated magnetic and electronic properties through strain effects, altering density and intrinsic electronic correlations. In this review, we examine the influence of nanoparticle size, shape, and composition on magnetic and tunneling magnetoresistance (TMR) properties, using magnetite (Fe3O4) as an example. The magnetic and TMR properties of Fe3O4 nanoparticles are strongly related to their size, shape, and synthesis process. Remarkably, faceted nanoparticles exhibit bulk-like magnetic and TMR properties even at ultra-small size-scale. Moreover, it is crucial to comprehend that TMR can be tailored or enhanced through chemical and/or structural modifications, enabling the creation of "artificially engineered" magnetic materials for innovative spintronic applications.

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Section: Introductionmentioning

confidence: 99%

Magnetic and electronic properties of anisotropic magnetite nanoparticles

Mitra,

Mohapatra,

Aslam

2024

Mater. Res. Express

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“…Fe-based bulk amorphous alloys (BAA) have aroused widespread interest due to their excellent magnetic properties (MPs), mechanical properties and low raw material costs [ 1 , 2 ]. Usually, Fe-based BAAs exhibit soft magnetic properties (SMPs) in the as-cast state.…”

Section: Introductionmentioning

confidence: 99%

“…The Fe 70−x Nd 7 B 21 Zr 2 Nb x (x = 0-3.0) alloys are selected based on our previous works [11]. The reasons for choosing Nb elements are: (1) The addition of appropriate Nb element [12][13][14] can enhance the amorphous formation ability of certain Fe-based alloys. Because the addition of the element Nb conforms to the three empirical laws proposed by Inoue for the formation of BAAs [15,16]: (a) the alloy consists of three or more group elements; (b) the difference between the atomic sizes of Nb and the major elements in the alloys are large (Nb-Fe: 15.27%, Nb-B: 43.…”

Section: Introductionmentioning

confidence: 99%

Fe70−xNd7B21Zr2Nbx (x = 0–3.0) Permanent Magnets Produced by Crystallizing Amorphous Precursors

Gu,

Wang,

et al. 2024

Materials

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The phase evolution, magnetic properties and microstructure of rod-shaped permanent magnets prepared by annealing the amorphous precursor Fe70−xNd7B21Zr2Nbx (x = 0–3.0) were systematically studied. X-ray diffraction analysis, magnetometer, microstructure and δM-plots studies show that the good magnetic properties of the magnet are attributed to the uniform microstructure composed of exchange-coupled α-Fe and Nd2Fe14B phases. Nb addition to Fe67.5Nd7B21Zr2Nb2.5 alloy led to an increase in the volume fraction of the soft magnetic phase, reinforced exchange coupling and improved magnetic properties. The magnetic properties of the optimized annealed Fe67.5Nd7B21Zr2Nb2.5 rod are: coercivity (Hci) = 513.92 kA/m, remanence (Br) = 0.58 T, squareness (Hk/Hci) = 0.24 and magnetic energy product ((BH)max) = 37.59 kJ/m3.

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“…Several potential material families have been identified, a few of them attracting a dedicated interest for further developments, including Mn-based magnets such as MnAl and MnBi compounds [8][9][10][11] or Co-based alloys including Hf-Co and Zr-Co [12][13][14][15]. Among the potential hard magnets based on Fe, Materials 2024, 17, 2476 2 of 11 Fe 2 P compounds stand out for their relatively large magneto-crystalline anisotropy and significant saturation magnetization [16].…”

Section: Introductionmentioning

confidence: 99%

Optimizing the Sintering Conditions of (Fe,Co)1.95(P,Si) Compounds for Permanent Magnet Applications

Yiderigu,

Yibole,

Bao

et al. 2024

Materials

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(Fe,Co)2(P,Si) quaternary compounds combine large uniaxial magnetocrystalline anisotropy, significant saturation magnetization and tunable Curie temperature, making them attractive for permanent magnet applications. Single crystals or conventionally prepared bulk polycrystalline (Fe,Co)2(P,Si) samples do not, however, show a significant coercivity. Here, after a ball-milling stage of elemental precursors, we optimize the sintering temperature and duration during the solid-state synthesis of bulk Fe1.85Co0.1P0.8Si0.2 compounds so as to obtain coercivity in bulk samples. We pay special attention to shortening the heat treatment in order to limit grain growth. Powder X-ray diffraction experiments demonstrate that a sintering of a few minutes is sufficient to form the desired Fe2P-type hexagonal structure with limited secondary-phase content (~5 wt.%). Coercivity is achieved in bulk Fe1.85Co0.1P0.8Si0.2 quaternary compounds by shortening the heat treatment. Surprisingly, the largest coercivities are observed in the samples presenting large amounts of secondary-phase content (>5 wt.%). In addition to the shape of the virgin magnetization curve, this may indicate a dominant wall-pining coercivity mechanism. Despite a tenfold improvement of the coercive fields for bulk samples, the achieved performances remain modest (HC ≈ 0.6 kOe at room temperature). These results nonetheless establish a benchmark for future developments of (Fe,Co)2(P,Si) compounds as permanent magnets.

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Hard and semi-hard Fe-based magnetic materials

Cited by 10 publications

References 152 publications

Magnetic and electronic properties of anisotropic magnetite nanoparticles

Magnetic and electronic properties of anisotropic magnetite nanoparticles

Fe70−xNd7B21Zr2Nbx (x = 0–3.0) Permanent Magnets Produced by Crystallizing Amorphous Precursors

Optimizing the Sintering Conditions of (Fe,Co)1.95(P,Si) Compounds for Permanent Magnet Applications

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