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Bang, Wonbae,Lee, Jae-Bang,Hong, Kimin,Ko, Young-Dong,Chung, Jin-Seok,Lee, Heebok WILEY-VCH Verlag 2007 Physica status solidi. PSS. A, Applications and ma Vol.204 No.12
<P>We investigated the correlation between the surface roughness and the magnetic properties in electroplated Ni–Fe Permalloy thin films. The Ni–Fe Permalloy thin films electroplated with electrolytes containing a leveling additive showed reduction of coercivity and increase of permeability compared with those prepared with pure inorganic electrolytes. The decrease of the surface roughness resulted in the reduction of coercivity and showed a strong correlation. The improvements in the surface roughness and coercivity caused the initial and incremental permeability increase by 450% and 130%, respectively. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>
Magnetoimpedance of Galvanostatically Electroplated Ni-Fe Permalloy Wires
Hojun Lee,Wonbae Bang,Kimin Hong,Dohun Kim,Jiwon Na,Won Young Jeung IEEE 2009 IEEE transactions on magnetics Vol.45 No.6
<P>We studied the magnetoimpedance of narrow Ni-Fe Permalloy wires prepared by electrodeposition. The wires were fabricated by lithographical patterning and chemical etching of electroplated thin films. The microstructure and magnetic property of the deposit were adjusted by using an organic additive added to the electrolyte. Aspect ratio of the wires was varied between 10 and 50 by changing the length of the wire while the thickness and width were fixed. The magnetoimpedance exhibited highest value at 30 MHz and was 18-25% depending on the aspect ratio. The magnetic fields for the highest magnetoresistance increased in proportion to the frequency in the range between 1 and 100 MHz.</P>