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Open AccessArticle

Structure and Magnetism of Co2Ge Nanoparticles

1
Department of Physics and Astronomy, University of Delaware, Newark, DE 19711, USA
2
Department of Physics and Astronomy, University of Nebraska, Lincoln, NE 68588, USA
3
Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE 68588, USA
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(10), 1371; https://doi.org/10.3390/nano9101371
Received: 4 September 2019 / Revised: 22 September 2019 / Accepted: 22 September 2019 / Published: 25 September 2019
The structural and magnetic properties of Co2Ge nanoparticles (NPs) prepared by the cluster-beam deposition (CBD) technique have been investigated. As-made particles with an average size of 5.5 nm exhibit a mixture of hexagonal and orthorhombic crystal structures. Thermomagnetic measurements showed that the as-made particles are superparamagnetic at room temperature with a blocking temperature (TB) of 20 K. When the particles are annealed at 823 K for 12 h, their size is increased to 13 nm and they develop a new orthorhombic crystal structure, with a Curie temperature (TC) of 815 K. This is drastically different from bulk, which are ferromagnetic at cryogenic temperatures only. X-ray diffraction (XRD) measurements suggest the formation of a new Co-rich orthorhombic phase (OP) with slightly increased c/a ratio in the annealed particles and this is believed to be the reason for the drastic change in their magnetic properties. View Full-Text
Keywords: magnetic nanoparticles; cluster deposition; Curie temperature; magnetocrystalline anisotropy magnetic nanoparticles; cluster deposition; Curie temperature; magnetocrystalline anisotropy
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Tosun, O.; Abel, F.M.; Balasubramanian, B.; Skomski, R.; Sellmyer, D.J.; Hadjipanayis, G.C. Structure and Magnetism of Co2Ge Nanoparticles. Nanomaterials 2019, 9, 1371.

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