An investigation of the magnetic properties of Co-rich nanoparticles alloyed with a small fraction of Pt and Hf is presented. Co(Hf) and Co(Pt) nanoparticles with less than 15 at of dopants were produced using a cluster-deposition method. The nanoparticles have sizes of less than 10 nm and show improved magnetic properties upon doping. Maximum coercivities of 900 Oe (at 300 K) and 2000 Oe (at 10 K) were observed for Co nanoparticles alloyed with 14.1 at of Hf. Doped nanoparticles also exhibit high anisotropies, such as K 1 9.98 Mergscm 3 (14.1 at of Hf) and K 1 8.24 Mergscm 3 (9.5 at of Pt), as compared to Co nanoparticles (K 1 6.21 Mergscm 3).
ASJC Scopus subject areas
- Physics and Astronomy(all)