Preparation of Co–Fe–P amorphous fine needles with anodization technique and measurement of demagnetizing factor

Abstract

The amorphous Co–Fe–P and crystalline Co fine needles with diameter 0.1–0.2 μm aspect ratio more than 100 were prepared successfully by applying the dc electrodeposition to the anodization technique and their demagnetizing factors were measured. It was found that the demagnetizing factor of film with needles decreases with increasing aspect ratio and tends to take low constant values around 0.07–0.08. To obtain the low demagnetizing factor by using the shape anisotropy of needle, it was estimated that the aspect ratio more than 100 is needed. The equivalent demagnetizing factor defined by a ratio of a field needed to achieve saturation to the averaged flux density is estimated around 0.6 for the film with Co–Fe–P amorphous needles with 0.1 μm diameter.

Magnetoresistance of Nanowires Electrodeposited into Anodized Aluminum Oxide Nanochannels

“…On the contrary, when this barrier layer is removed or thinned without removing the aluminum backing, anodized aluminum templates with short pores length can be obtained. Since the thickness of the barrier layer is about several tens of nanometres, this layer can be removed or thinned using a chemical etching technique from the pore side direction [46]. Therefore, after the anodization process, to remove or thin this barrier layer without dissolving the metallic aluminum backing, the anodized aluminum templates were subsequently immersed in an aqueous solution containing phosphoric acid prior to the electrode position process.…”

Electrodeposition of Metallic Nanowires in Nanoporous Polycarbonate Films

“…) have been used so far for electrodeposition of nanowires [12][13][14][15][16][17]. Template synthesis technique such as fabricating nano-pores and electrodepositing nanowires requires precise techniques controlling position of each nano-pore, inter-pore distance, pore diameter and pore shape [18][19][20].…”

CdTe semiconductor nanowires and NiFe ferro-magnetic metal nanowires electrodeposited into cylindrical nano-pores on the surface of anodized aluminum

“…It is well known that the barrier layer can be removed from the substrate side direction by dissolving the massive metallic aluminum backing [20][21][22]. However, since the thickness of barrier layer is assumed to be around several tens of nm [23], this layer can be removed or thinned using a chemical etching technique from the pore side without dissolving the aluminum substrate [24][25][26].…”