Magnetism of dilute Co(Hf) and Co(Pt) nanoclusters

Authors

Balamurugan Balasubramanian, University of Nebraska - LincolnFollow
Ralph Skomski, University of Nebraska-LincolnFollow
Xingzhong Li, University of Nebraska - LincolnFollow
Shah R. V, University of Nebraska- Lincoln
Priyanka Manchanda, LMN Institute of Information TechnologyFollow
Arti Kashyap, University of Nebraska-LincolnFollow
David J. Sellmyer, University of Nebraska-LincolnFollow

Document Type

Article

Date of this Version

2012

Citation

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

Comments

Copyright VC 2012 American Institute of Physics

Abstract

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).