Tailoring the magnetic properties of CoFeNi alloys with variations in copper contents

Abstract

CoFeNi alloys are some of the most studied soft magnetic materials because of their superior properties over FeNi alloys as write head core materials in hard disk drives. Pulsed electrodeposition was shown to be an interesting approach to vary the crystalline structure of the fcc-bcc mixed phase CoFeNi and CoFeNiCu films without changing the composition and the grain size by using a single bath. The permeability of CoFeNiCu films plated from bath composition exceeded 4.6ϫ 10 6 . Coercivity H c was 20-73 A / m. The high saturation magnetic flux B s was 1.8 T. The soft magnetic CoFeNiCu film prepared satisfies all the requirements needed for the preparation of magnetic recording heads, as all magnetic properties were improved in this direction.

Studies of electrical resistivity and magnetic properties of nanocrystalline CoFeCu thin films electrodeposited from citrate-added baths

“…Among the alloying elements, copper might be an interesting candidate, due to the fact that copper is a diamagnetic metal and definitely causes reduction in saturation magnetization value. However, studies of other researcher [12,20,21] show that little amount of copper can strongly result in noticeable reduction in grain size of Co-Fe thin films. In fact, as mentioned in the literature [12], in the ferromagnetic materials, if the grain size (D) is in the nanometer range, where it is smaller than the effective domain-wall with, films coercivity shows a steep decrease with decreasing grain size.…”

Fabrication and magnetic properties of Ni–Zn nanowire arrays

“…Recently, one-dimensional and quasi-one-dimensional nanostructured materials have attracted considerable interest because of their applications in optics and high-density perpendicular magnetic recording media and much effort has been expended on the synthesis of these materials [1][2][3][4]. Among the different preparation procedures, the most widely used is the template method [5][6][7].…”