Spin-spray deposited NiZn-Ferrite films exhibiting μ r′>50 at GHz range

Ogheneyunume Obi, Ming Liu, Jing Lou, Stephen Stoute, Xing Xing, Nian X. Sun, Juliusz Warzywoda, Albert Sacco, Daniel E. Oates, Gerald F. Dionne

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33 Scopus citations


Ni0.27ZnxFe2.73-xO4 (with x 0.03-0.1) thin films with high real permeability r′ in the GHz range were fabricated by the spin spray process onto glass substrates in the presence of an external magnetic field of 360 Oe. These films exhibit high permeabilities that exceeded the Snoek limit for bulk NiZn-ferrite films and those previously reported for spin spray deposited ferrites. The NiZn-ferrite film with x 0.06 is low in magnetic losses, having tanm ( r″/r′) ∼ 0.027 from 1 to 1.5 GHz, and a high ferromagnetic resonance (FMR) frequency of 2.7 GHz, while the x 0.1 film exhibited a high r′ of ∼50 and r″ 50 at 1 GHz. These properties are ideal for microwave applications such as antennas, inductors and electromagnetic interference (EMI) suppression in the GHz range.

Original languageEnglish
Article number07E527
JournalJournal of Applied Physics
Issue number7
StatePublished - Apr 1 2011


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