Structure and magnetic properties of bulk anisotropic SmCo5/α-Fe nanocomposite permanent magnets prepared via a bottom up approach

Hu, Dengwei; Yue, Ming; Zuo, J. H.; Pan, Rui; Zhang, D.T.; Liu, W.Q.; Zhang, J.X.; Guo, Zhaohui; Li, W.

doi:10.1016/j.jallcom.2012.05.079

Cited by 46 publications

(14 citation statements)

References 9 publications

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“…[3][4][5][6][7][8][9][10][11][12] In particular, (BH) max values exceeding the theoretical limit of SmCo 5 have been reported in multi-layered and tri-layered SmCo 5 /a-Fe films, 11,12 which suggests that a layered structure has an advantage in controlling a microstructure.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties and microstructure of Sm-Co/α-Fe nanocomposite thick film-magnets composed of multi-layers over 700 layers

Tou¹,

Morimura²,

Nakano³

et al. 2014

Journal of Applied Physics

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We synthesized Sm-Co/a-Fe nanocomposite film-magnets, approximately 10 lm in thickness, composed of 780 layers by the pulse laser deposition method. Transmission electron microscopic observations revealed that the synthesized film is composed of Sm-Co and a-Fe layers with the well-controlled a-Fe thickness of approximately 10-20 nm, which is suitable one predicted by the micromagnetic simulation. In spite of the enhanced interlayer diffusion of Fe and Co by annealing for crystallization, the (BH) max value of 100 kJ/m 3 was obtained at the averaged compositions of Sm/(Sm þ Co) ¼ 0.16 and Fe/(Sm þ Co þ Fe) ¼ 0.47. The a-Fe fraction for obtaining the highest (BH) max value was smaller than that expected from the micromagnetic simulation. Although the annealing for crystallization lay the easy direction of magnetization in the plane, the film is not expected to have strong crystallographic texture. V C 2014 AIP Publishing LLC. [http://dx

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Section: Introductionmentioning

confidence: 99%

Magnetic properties and microstructure of Sm-Co/α-Fe nanocomposite thick film-magnets composed of multi-layers over 700 layers

Tou¹,

Morimura²,

Nakano³

et al. 2014

Journal of Applied Physics

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“…The magnetic properties obtained from these measurements are again summarized in Table 1. For textured hard magnets, the coercivity strongly changes, if the measurement field is applied parallel or perpendicular to the easy axis of the crystals due to its large magnetocrystalline anisotropy [1,[29][30][31]. The higher susceptibility is caused by the uncoupled volume of the Fe phase, as the magnetic moment originating from SmCo 5 in the magnetically hard direction (basal plane) would saturate much slower.…”

Section: Samplementioning

confidence: 99%

“…First, manufacturing a textured magnetic material, where the magnetically easy axis of many crystallites is aligned in one direction. Such textured magnets show a pronounced rectangular hysteresis loop when the measuring field is applied parallel to the easy axis and are referred to as anisotropic magnets [ 1 ]. Second, by combining a hard-magnetic with a soft-magnetic phase forming an exchange-spring magnetic material.…”

Section: Introductionmentioning

confidence: 99%

Manufacturing of Textured Bulk Fe-SmCo5 Magnets by Severe Plastic Deformation

et al. 2022

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Exchange-coupling between soft- and hard-magnetic phases plays an important role in the engineering of novel magnetic materials. To achieve exchange coupling, a two-phase microstructure is necessary. This interface effect is further enhanced if both phase dimensions are reduced to the nanometer scale. At the same time, it is challenging to obtain large sample dimensions. In this study, powder blends and ball-milled powder blends of Fe-SmCo5 are consolidated and are deformed by high-pressure torsion (HPT), as this technique allows us to produce bulk magnetic materials of reasonable sizes. Additionally, the effect of severe deformation by ball-milling and severe plastic deformation by HPT on exchange coupling in Fe-SmCo5 composites is investigated. Due to the applied shear deformation, it is possible to obtain a texture in both phases, resulting in an anisotropic magnetic behavior and an improved magnetic performance.

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“…Theoretical modelling suggests that the energy product can be significantly enhanced in nanocomposites which intimately combine a high coercivity hard phase with a high magnetization soft phase [6]. While both top-down [7] and bottom-up [8] techniques have been used to fabricate hard-soft nanocomposites, the reported energy products fall far short of predicted values. This is attributed to insufficient control of the dimensions of the soft magnetic phase, which according to modelling, should be no larger than twice the domain wall width, d, of the hard phase (d = 2.6, 3.9 and 4.5 nm for SmCo5, Nd2Fe14B and CoPt, respectively) [1].…”

Section: Introductionmentioning

confidence: 99%

Textured Nd-Fe-B hard magnetic thin films prepared by pulsed laser deposition with single alloy targets

Van

Moraes

Dempsey

et al. 2021

Journal of Magnetism and Magnetic Materials

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Structure and magnetic properties of bulk anisotropic SmCo5/α-Fe nanocomposite permanent magnets prepared via a bottom up approach

Cited by 46 publications

References 9 publications

Magnetic properties and microstructure of Sm-Co/α-Fe nanocomposite thick film-magnets composed of multi-layers over 700 layers

Magnetic properties and microstructure of Sm-Co/α-Fe nanocomposite thick film-magnets composed of multi-layers over 700 layers

Manufacturing of Textured Bulk Fe-SmCo5 Magnets by Severe Plastic Deformation

Textured Nd-Fe-B hard magnetic thin films prepared by pulsed laser deposition with single alloy targets

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