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

Journal Article · Sun Apr 01 00:00:00 EDT 2012 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3678582· OSTI ID:1211305

Balamurugan, B; Skomski, R; Das, B; Li, XZ; Shah, VR; Manchanda, P; Kashyap, A; Sellmyer, DJ

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 Mergs/cm(3) (14.1 at% of Hf) and K-1 = 8.24 Mergs/cm(3) (9.5 at% of Pt), as compared to Co nanoparticles (K-1 = 6.21 Mergs/cm(3)). (C) 2012 American Institute of Physics. [doi:10.1063/1.3678582]

• Sponsoring Organization: USDOE Advanced Research Projects Agency - Energy (ARPA-E)
• DOE Contract Number: DE-AR0000046
• OSTI ID: 1211305
• Journal Information: Journal of Applied Physics, Vol. 111, Issue 7; ISSN 0021-8979
• Country of Publication: United States
• Language: English