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Magnetism of dilute Co(Hf) and Co(Pt) nanoclusters
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) X-ray diffraction patterns of Co-Hf nanoparticles having (i) 7.7 at% and (ii) 14.1 at% of Hf. The standard positions of diffraction peaks corresponding to bulk Co (vertical-dotted lines) and bulk HfCo7 (vertical-solid lines) are also shown. (b) Transmission electron microscope image of Co-Hf nanoparticles with 14.1 at% of Hf, where the corresponding particle-size histogram fitted with Lorentzian distribution is given as an inset. σ and d are the standard deviation and average particle size, respectively.

Image of FIG. 2.
FIG. 2.

(a) Hysteresis loops measured at 300 K for Co-Hf nanoparticles having 7.7 at% and 14.1 at% of Hf. (b) Coercivities at 300 K and 10 K for Co-Hf nanoparticles as a function Hf concentration.

Image of FIG. 3.
FIG. 3.

(Color online) Cluster-deposited nanoparticles dispersed in SiO2 matrix deposited by sequential depositions of nanoparticle and matrix (SiO2) layers: (a) Schematic view, and (b) room-temperature hysteresis curves and (c) field-cooled (solid circle) and zero-field-cooled (open circle) magnetization curves at an applied field of H = 50 Oe for (i) Co, (ii) Co(Pt) with 9.5 at% Pt, (iii) Co(Hf) with 7.7 at.% Hf, and (iv) Co(Hf) with 14.1 at.% Hf. These curves are presented in arbitrary units—in order to distinguish them clearly.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetism of dilute Co(Hf) and Co(Pt) nanoclusters