Structural and magnetic properties of Co-V nanoparticles

Authors

Onur Tosun, University of DelawareFollow
I. Ruzybayev, University of Delaware
F. M. Abel, University of Delaware
B. Balamurugan, University of Nebraska-LincolnFollow
R. Skomski, University of Nebraska-LincolnFollow
D. J. Sellmyer, University of Nebraska - LincolnFollow
G. C. Hadjipanayis, University of Delaware

ORCID IDs

O. Tosun

F. M. Abel

Date of this Version

2019

Citation

AIP Advances 9, 125144 (2019)

Comments

© 2019 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license

https://doi.org/10.1063/1.5130456

Abstract

We have investigated the structural and magnetic properties of Co_1-xV_x nanoparticles (NPs) with composition x = 0.25 (stoichiometric) and 0.29 (under-stoichiometric) prepared by the cluster-beam deposition (CBD) technique. Our data shows that the as-made Co_1-xV_x NPs are a mixture of the high-temperature phase (HTP) and the low-temperature phase (LTP) of Co₃V and the particles are superparamagnetic at room temperature (RT) with blocking temperatures (T_B) of 90 and 137 K for x = 0.25 and 0.29, respectively. This behavior contrasts with the bulk which are paramagnetic down to 4.2 K. When the Co₇₅V₂₅ NPs are annealed at 573 K, they undergo a phase separation into a mixture of phases and become ferromagnetic at room temperature with Curie temperature (T_c) of 515 K.