Magnetic anisotropy in bulk nanocrystalline SmCo5 permanent magnet prepared by hot deformation

Abstract

Bulk anisotropic nanocrystalline SmCo5 magnets have been prepared by hot deformation method. The height reduction of the magnets plays a key role in inducing the crystallographic alignment in the magnet. Increase of height reduction to 90% leads to the formation of platelet shape grains perpendicular to the press direction; correspondingly c-axis crystallographic texture and magnetic anisotropy were developed in the deformed magnets. The coercivity of the magnets increases first,and then decreases again with the increase of the height reduction. The magnet with 70% height reduction exhibits a high coercivity over 5 T.

Synthesis of Gd2O3:Eu nanoplatelets for MRI and fluorescence imaging

“…The second method is referred to the analysis of emission spectra at room temperature. It is noteworthy to mention that in the case of Eu 3+ -doped nontransparent hosts, we are not always able to measure the absorption spectra [40,41]. Therefore, for Gd 2 O 3 :Eu 3+ nanoplatelets, the second method allows the calculation of J-O parameters.…”

“…Thus, the values of Ω k can be calculated using the emissions of 5 D 0 → 7 F J ' ( J ' = 2, 4, 6). The results of our calculations are shown in Table 3 together with the Ω k values of Eu 3+ ions in other hosts [41,51-57]. …”

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

“…[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.…”

Effect of hot deformation on texture and magnetic properties of Sm–Co and Pr–Co alloys

“…The other R-Co hard magnetic compound, rhombohedral Sm 2 Co 17 , showed no deformationinduced texture, at least when upset by up to 70% [5]. Recently, Yue et al [6] reported that a significantly improved texture can be obtained in the nanocrystalline SmCo 5 alloys subjected to dieupsetting at a very high degree of deformation (more than 85% height reduction). In this paper, we report the effect of high degree deformation on the texture and magnetic properties of nanocrystalline alloys based on the PrCo 5 , SmCo 5 and Sm 2 Co 17 compounds.…”