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Amorphous Slater-Pauling like behaviour in magnetic nanoparticles alloys synthesized in liquids
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View: Figures


Image of FIG. 1.
FIG. 1.

TEM picture showing spherical Co NPs with an average size of 12 nm.

Image of FIG. 2.
FIG. 2.

XRD spectra of Co NPs after ablation, fragmentation or 1 h annealing at 275 °C in air. The crystalline structure is amorphous after laser ablation or fragmentation and is a crystalline Co3O4 after annealing.

Image of FIG. 3.
FIG. 3.

Typical magnetization curve of Co NPs showing superparamagnetism with a saturation magnetization of 27 emu/g.

Image of FIG. 4.
FIG. 4.

NPs room temperature (left) and bulk Slater-Pauling5 at 0 K (right) saturation magnetization of Fe, Co, Ni, and their alloys. TM80P20 indicates the magnetization of an amorphous bulk alloy made of 80% transition metal and 20% P.

Image of FIG. 5.
FIG. 5.

Saturation magnetization of Co NPs as a function of temperature and the fit for the NPs heated below 400 K computed from the model of Stifler using Eqs. (2) and (3).37

Image of FIG. 6.
FIG. 6.

Room temperature hysteresis curve of Co NPs after been annealed at 500 K. The coercive field and the remanent to saturation magnetization ratio are close to those of bulk hcp Co.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Amorphous Slater-Pauling like behaviour in magnetic nanoparticles alloys synthesized in liquids