Chapter 2 Rare earth-cobalt permanent magnets

Strnat, K.

doi:10.1016/s1574-9304(05)80077-x

Cited by 129 publications

(49 citation statements)

References 101 publications

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“…Hence, the formation energy calculation indicate that the realized structure is likely a mix of 2-17 and 1-5 structures. Interestingly, this may be related to experimental observations that successful 2-17 magnets usually have one common microstructure, i.e., separated cells of 2-17 phase surrounded by a thin shell of a 1-5 boundary phase, and Zr, Hf, or Ti additions promote the formation of such structure [3].…”

Section: Origin Of Mae In Ce 2 T 2 Co 15 With T = Fe and Mnmentioning

confidence: 83%

“…1. This anisotropy enhancement has been attributed to the preferential substitution effects of doping atoms [2,3]: (i) The four nonequivalent Co sites contribute differently [4] to the magnetic anisotropy in Ce 2 Co 17 . Two out of the 17 Co atoms occupy the so-called dumbbell sites and have a very negative contribution to uniaxial anisotropy, leading to the small overall uniaxial anisotropy; (ii) Doping atoms preferentially replace the dumbbell sites first, eliminating their negative contribution and increasing the overall uniaxial anisotropy.…”

Section: Introductionmentioning

confidence: 99%

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Origin of magnetic anisotropy in doped Ce2Co17 alloys

Kukusta

Johnson

2016

Phys. Rev. B

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Magnetocrystalline anisotropy (MCA) in doped Ce 2 Co 17 and other competing structures was investigated using density functional theory. We confirmed that the MCA contribution from dumbbell Co sites is very negative. Replacing Co dumbbell atoms with a pair of Fe or Mn atoms greatly enhance the uniaxial anisotropy, which agrees quantitatively with experiment, and this enhancement arises from electronic-structure features near the Fermi level, mostly associated with dumbbell sites. With Co dumbbell atoms replaced by other elements, the variation of anisotropy is generally a collective effect and contributions from other sublattices may change significantly. Moreover, we found that Zr doping promotes the formation of 1-5 structure that exhibits a large uniaxial anisotropy, such that Zr is the most effective element to enhance MCA in this system.

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Section: Origin Of Mae In Ce 2 T 2 Co 15 With T = Fe and Mnmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Origin of magnetic anisotropy in doped Ce2Co17 alloys

Kukusta

Johnson

2016

Phys. Rev. B

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“…These compounds have been used as sintered and bonded permanent magnets since the 1960s. [1][2][3] Recently, attention has been focused on the TbCu 7 -type structure Sm-Co intermetallic compounds because of their potential as high anisotropy magnetic materials. [4][5][6] Both SmCo 7 and Sm 2 Co 17 can have the 1-7 type structure when prepared appropriately.…”

Section: Introductionmentioning

confidence: 99%

Structure and magnetic properties of SmCo7−xTix with TbCu7-type structure

Zhou

Al‐Omari

Liu

et al. 2000

Journal of Applied Physics

103

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The SmCo7−xTix, x=0–0.56 bulk samples are prepared by arc melting. X-ray diffraction indicates that samples with 0.2<x<0.4 form a single disordered TbCu7-type structure phase and other minor phases appear for other values of x, which indicates that Ti helps stabilize the 1-7 phase. The lattice parameters ratio (c/a) increases with increasing Ti concentration. Room temperature saturation magnetization and Curie temperature decrease with increasing x. X-ray diffraction and magnetization measurements on aligned samples show that all samples studied have uniaxial anisotropy. The anisotropy field is found to increase with increasing x reaching a maximum of 175 kOe at x=0.28 and then decreases for higher values of x. This anisotropy field is 20% higher than that of the same compound with Th2Zn17-type structure.

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“…In order to control the easy magnetization direction, well-defined epitaxial films are useful, since the crystallographic orientation of film can be controlled by that of single-crystal substrate. A bulk SmCo5 ordered alloy crystal with RT5-type structure (R: rare earth metal, T: transition metal) shows Ku of 1.1 × 10 8 erg/cm 3 along the c-axis 1) . SmCo5(112 _ 0) and (11 _ 00) epitaxial films with the c-axis lying in the film plane have been respectively prepared on MgO single-crystal substrates of (100) [2][3][4][5] and (110) [3][4][5][6] orientations by employing W 4) , Cr 2,3) , and Fe 5,6) underlayers.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Structure Characterization of Sm-Ni Alloy Epitaxial Thin Films

et al. 2015

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Sm x Ni 100-x (at. %) alloy thin films are prepared on Cr(100) underlayers hetero-epitaxially grown on MgO(100) single-crystal substrates at 500 °C by employing an ultra-high vacuum molecular beam epitaxy system with varying the Sm content from Ni-rich to Sm-rich region (x = 10-25 at. %) including the SmNi5 stoichiometry. The influence of film composition on ordered phase formation is studied by reflection high-energy electron diffraction and X-ray diffraction. Sm-Ni films with Sm compositions between 13 and 17 at. % consist of (112 _ 0) epitaxial crystals with RT5-type structure. The epitaxial films involve two types of (112 _ 0) variant whose c-axes are lying in the film plane and rotated around the film normal by 90° each other. As the Sm content departs from the compositional range, an amorphous phase tends to be included in the film in addition to SmNi5 ordered phase.

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Chapter 2 Rare earth-cobalt permanent magnets

Cited by 129 publications

References 101 publications

Origin of magnetic anisotropy in doped Ce2Co17 alloys

Origin of magnetic anisotropy in doped Ce2Co17 alloys

Structure and magnetic properties of SmCo7−xTix with TbCu7-type structure

Preparation and Structure Characterization of Sm-Ni Alloy Epitaxial Thin Films

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