Research Papers in Physics and Astronomy


Date of this Version



JOURNAL OF APPLIED PHYSICS 111, 07B532 (2012); doi:10.1063/1.3678582


Copyright VC 2012 American Institute of Physics


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 K1¼9.98 Mergs=cm3 (14.1 at% of Hf) and K1¼8.24 Mergs=cm3 (9.5 at% of Pt), as compared to Co nanoparticles (K1¼6.21 Mergs=cm3).

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