Magnetically soft and electrically resistive CoNiFeS alloy films prepared by electrodeposition

Young Keun Kim, Hee Young Son, Young Sik Choi, Ki Seok Moon, Kuk Hyun Sunwoo

Research output: Contribution to journalConference articlepeer-review

15 Citations (Scopus)


Magnetic properties of electrodeposited CoNiFeS films were studied to seek their feasibility for applications in microelectromagnetic devices such as high areal density recording heads. We started with NiFe and then expanded experiments to a CoNiFe system. Finally, we added a fourth element, sulfur, to further improve physical properties. A small amount of sulfur inclusion has induced grain size refinement and offered magnetic softness to the film accompanying with increased electrical resistivity. Grain size was found to be in the order of 10 nm. Co73Ni17Fe9S1 (in wt. %) films with thickness of 2.5 μm exhibit superior properties compared with currently utilized Ni45Fe55: high saturation magnetic flux density (Bs∼17 kG), low coercivity (Hc∼0.4 Oe), near zero saturation magnetostriction (λs∼1.0×10-6), high permeability (μ∼1300 at 100 MHz), and high electrical resistivity (ρ∼55 μΩ cm). From a processing standpoint, we were able to control film thickness uniformity by adjusting current distributions between the auxiliary electrode and cathode across 100 mm wafers.

Original languageEnglish
Pages (from-to)5413-5415
Number of pages3
JournalJournal of Applied Physics
Issue number9 II
Publication statusPublished - 2000 May
Event44th Annual Conference on Magnetism and Magnetic Materials - San Jose, CA, United States
Duration: 1999 Nov 151999 Nov 18

ASJC Scopus subject areas

  • General Physics and Astronomy


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