English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

The magnetization of Zn1-xCoxO (0.0055 < x < 0.073) nanoparticles has beenmeasured as a function of temperature T (1.7 K < T , 10 K) and for magneticfield up to 65 kOe using a SQUID magnetometer. Samples were synthesized bythree different growth methods: microwave-assisted hydrothermal, combustionreaction and sol-gel. For all studied samples, the magnetic properties derivefrom the antiferromagnetic (AF) spin clustering due to the Co2+ nearestneighbors. At T >= 6 K, the magnetization of the Co2+ ions has a Brillouin-typebehavior, but below 6 K, it shows a notable deviation. We have shown that theobserved deviation may be derived from single-ion anisotropy (SIA) withuniaxial symmetry. Results of fits show that the axial-SIA parameter D(typically D = 4.4 K) is slightly larger that the bulk value D = 3.97 K. Nosignificant change of D has been observed as a function of the Co concentrationor the growth process. For each sample, the SIA fit gave also the effectiveconcentration (x) corresponding to the technical saturation value of themagnetization. Comparison of the concentration dependence of x with predictionsbased on cluster models shows an enhancement of the AF spin clusteringindependent of the growth method. This is ascribed to a clamped non-randomdistribution of the cobalt ions in the nanoparticles. The approach of the localconcentration (xL) has been used to quantify the observed deviation fromrandomicity. Assuming a ZnO core/ Zn1-xCoxO shell nanoparticle, the thicknessof the shell has been determined from the ratio xL/x.

Magnetization of Zn1-xCoxO nanoparticles: single-ion anisotropy and spin clustering