Ferromagnetism of Dy films containing embedded Fe atoms and nanoparticles

Iles, Gail N.; Binns, C.; Baker, Salah A.; Roy, Mervyn

doi:10.1016/j.jmmm.2010.03.010

Cited by 6 publications

(2 citation statements)

References 24 publications

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“…Using the technique magnetic nanoparticles have been embedded into non-magnetic metallic matrices to produce films displaying GMR [7,8] materials, into insulating matrices to produce TMR [9] materials and into ferromagnetic (F) matrices to produce granular FeCo films whose magnetization exceeds the Slater-Pauling limit [5]. There have so far been no reports of magnetic nanoparticles embedded in antiferromagnetic (AF) matrices using the LECBD method with the exception of Fe nanoparticles embedded in Dy [10], which is antiferromagnetic in a restricted temperature range. Such systems are of great fundamental interest in providing a testbed for nanoscale F-AF interfaces but also from the point of view of applications, for example, in magnetic recording media, where interface exchange coupling provides an increase of thermal stability.…”

Section: Introductionmentioning

confidence: 99%

Interface exchange coupling in Co nanoparticles dispersed in a Mn matrix

Binns

Domingo

Testa

et al. 2010

J. Phys.: Condens. Matter

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The structural and magnetic properties of 1.8 nm Co particles dispersed in a Mn matrix by co-depositing pre-formed mass-selected Co clusters with an atomic vapour of Mn onto a common substrate have been studied by using EXAFS (extended x-ray absorption fine structure), XMCD (x-ray magnetic circular dichroism), magnetometry, and theoretical modelling. At low Co volume fraction (5%) Co@Mn shows a significant degree of alloying and the well-defined particles originally deposited become centres of high Co concentration CoMn alloy that evolves from pure Co at the nanoparticle centre to the pure Mn matrix within a few nm. Each inhomogeneity is a core-shell particle with a Co-rich ferromagnetic core in contact with a Co-depleted antiferromagnetic shell. The XMCD reveals that the Co moment localized on the Co atoms within the Co-rich cores is much smaller than the ferromagnetic moment of the Co nanoparticles deposited at the same volume fraction in Ag. Electronic structure calculations indicate that the small magnitude of the core Co moment can be understood only if significant alloying occurs. Monte Carlo modelling replicates the exchange bias (EB) behaviour observed at low temperature from magnetometry measurements. We ascribe EB to the interaction between the ferromagnetic Co-rich cores and the antiferromagnetic Mn-rich shells.

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Section: Introductionmentioning

confidence: 99%

Interface exchange coupling in Co nanoparticles dispersed in a Mn matrix

Binns

Domingo

Testa

et al. 2010

J. Phys.: Condens. Matter

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“…Therefore the lanthanides have been widely used as photoluminescent materials, 15 catalysts 16 and magnetic materials. 17 Lanthanides emit * Author to whom correspondence should be addressed. fluorescence attribute to their particular structure, which not only own high intensity and pure color but also have the fluorescence groups with low excitation energy.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Photoluminescent Behavior of Multi-Walled Carbon Nanotubes and Samarium Nanocomposites

Wang¹,

Fang²,

Gao³

et al. 2012

Jnl of Comp & Theo Nano

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In this study, rare earth metal samarium (Sm) was successfully plated on the surface of multiwall carbon nanotubes (MWCNTs) by a simple and efficient method in aqueous solution. This novel nanocomposites integrates the special performance of MWCNTs and Sm, demonstrating special photoluminescent behavior. The successful synthesis process and the structure of the obtained nanocomposites were confirmed by a series of characterization methods and instruments. The photoluminescence property of the nanocomposites was investigated in detail by fluorescence spectrophotometer. From these results we can conclude that Sm content make an important effect on the photoluminescence property. The photoluminescence intensity of the nanocomposites enhanced with the increace of Sm content. All the nanocomposites with different Sm content emit a yellow light at room temperature. Such photoluminescent materials combined the special properties of MWCNTs and samarium, showing potential application in various fields, such as light conversion agent, luminescent materials, phosphors and nanometer-scale opto-electronic devices.

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