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- W2014300897 abstract "► An unique XAS/XMCD experiment of embedded nanoparticles in insulating/dielectric oxide matrix to distinguish magnetic contributions of different phases. ► Element-specific magnetic characterizations of Ni nanoparticles dispersed in sapphire (Al 2 O 3 -0 0 1) matrix prepared by ion-implantation (Ni:5 × 10 16 –2 × 10 17 ions cm −2 ) has been investigated. ► We study the systematic evolutions of magnetic phases of Ni nanoparticles as a function of different Ni fluences and their magnetic response in the presence of other NiO x phases. ► Our XMCD data provide a distinct ‘fingerprint’ for the complex magnetic interactions between the nanophases of Ni NPs and NiO x . We report on the element-specific magnetic characterization of Ni nanoparticles (NPs) embedded in Al 2 O 3 (0 0 1) matrix prepared by ion-implantation (Ni:5 × 10 16 –2 × 10 17 ions cm −2 ) technique. The X-ray diffraction studies reveal the coexistence of fcc Ni NPs of average size ∼8–19 nm along with the other NiO x phases. X-ray magnetic circular dichroism (XMCD) experiments demonstrate the competing nature of magnetic interactions between the Ni NPs and NiO x phases. The ferromagnetism at 10 K (for all the Ni implants) is related to the combined contribution of both phases, while the room temperature superparamagnetism at higher fluence is dominated by Ni NPs phase as confirmed by Ni L 3,2 XMCD measurements." @default.
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- W2014300897 date "2011-01-01" @default.
- W2014300897 modified "2023-09-27" @default.
- W2014300897 title "Evolution of magnetic nanophases of Ni embedded in Al2O3 (001) matrix by X-ray magnetic circular dichroism" @default.
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- W2014300897 doi "https://doi.org/10.1016/j.cplett.2010.11.027" @default.
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