Title :
Nanogranular nickel iron thin films for high frequency power applications
Author :
Khan, G. Rezwan ; Sullivan, C.R.
Author_Institution :
Thayer Sch. of Eng., Dartmouth Coll., Hanover, NH, USA
Abstract :
Multi-layer nickel-iron-zirconia granular thin films were prepared using magnetron sputtering of NiFe and Zr targets in an Ar+O2 mixture. The resulting films showed strong uniaxial in-plane anisotropy and good soft magnetic properties which are promising for high frequency power applications. The material exhibited low hysteresis loss when excited along the hard-axis direction and is expected to have low eddy current losses at high frequencies due to the high in-plane resistivity and insulation layers between the granular magnetic layers. The core loss of the thin film is predicted to be significantly lower than commercial nickel-zinc and manganese-zinc ferrites, when excited with a peak ac flux density between 0 and 200 mT. A high relative permeability of 540 makes the material useful for applications such as transformers and coupled inductors.
Keywords :
iron compounds; nanostructured materials; nickel compounds; sputtering; zirconium compounds; NiFe; Zr; ac flux density; granular magnetic layers; high frequency power applications; high in-plane resistivity; high relative permeability; insulation layers; low eddy current losses; low hysteresis loss; magnetron sputtering; multilayer nickel-iron-zirconia granular thin films; nanogranular nickel iron thin films; soft magnetic properties; uniaxial in-plane anisotropy;
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2013 Twenty-Eighth Annual IEEE
Conference_Location :
Long Beach, CA
Print_ISBN :
978-1-4673-4354-1
Electronic_ISBN :
1048-2334
DOI :
10.1109/APEC.2013.6520516