Thin permalloys

Hoffmann H (1964) Quantitative calculation of magnetic ripple of uniaxial thin permalloy films. J Appl Phys 35 1790-1798... 

Another area with a large research activity is also related to computer technology. It is electrodeposition of magnetic alloys for thin-film recording heads and magnetic storage media. Here new magnetic materials are needed that have properties superior to those of electrodeposited NiEe (Permalloy). These activities are reviewed by Andricacos and Romankiw (25) and Romankiw (32). 

Mauri D, Scholl D, Siegmann HC et al (1989) Magnetism in very thin films of permalloy measured by spin polarized cascade electrons. Appl Phys A 49 439 147... 

P.A. Lane, P.J. Wright, P.E. Oliver, C.L. Reeves, A.D. Pitt, and J.M. Keen, Growth of Iron, Nickel, and Permalloy Thin Pilms by MOCVD for use in Magnetoresistive Sensors, Chemical Vapor Deposition, Vol.3, 1997, pp.97-101. 

After the bottom pole and insulator, a microwinding Cu coil is electrode-posited [121]. The insulator has to be prepared for the electrodeposition of Cu. This preparation involves the deposition of Cr/Cu bilayer by sputtering or evaporation. First, a thin layer (10 nm) of Cr is deposited onto the insulator. The function of the Cr layer is to provide a bonding layer between the insulator and Cu. A thin (50-100 nm) layer of Cu seed layer is then sputter deposited on Cr layer to provide sufficient electrical conductivity for subsequent electrodeposition of Cu. Cu is electrodeposited using deposition-through-mask technique. After electrodeposition of Cu coil, an insulator layer is deposited between the coil and the top pole layer. The top Permalloy pole is electrodeposited in the same way as the bottom pole layer, on thin sputter-deposited Permalloy underlayer (50-100 nm). The top and bottom pole layers are in contact. Finally, Cu interconnect pads, about 25-pm thick, are electrodeposited. The entire structure, poles and coil, is protected by an overcoat, usually sputtered AI2O3. The dimensions... 

Electroplated permalloy films for use as thin-film heads are based on the technology of magnetic wire memory developed in the 1950s. Ever since IBM applied the... 

Usually, AMR sensors are made of narrow stripes of NiglFe19, so-called permalloy, sputtered as thin films with a thickness of about 40 nm and several micrometers wide. The electrical resistance in these thin films is... 

Permalloys A group of alloys of high magnetic permeability consisting of iron and nickel (usually 40 0%) often with small amounts of other elements (e.g. 3-5% molybdenum, copper, chromium, or tungsten). They are used in thin foils in electronic transformers, for magnetic shielding, and in computer memories. 

Silva, T.J., C.S. Lee, T.M. Crawford, and C.T. Rogers. 1999. Inductive measurement of ultrafast magnetization dynamics in thin-film permalloy. Journal of Applied Physics 85(11) 7849-7862. 

The structure of thin-film inductive recording heads results in the exposure to the environment of small areas of metal, often permalloy (Ni-20Fe), which is a relatively corrosion-resistant alloy. In fact, in-service corrosion of permalloy is not a problem and thin-film inductive heads have no history of corrosion-induced field failure. However, corrosion of permalloy can occur during manufacturing, leading to yield losses. 

An explanation for the enhanced corrosion susceptibility of plated permalloy films was offered in a study that examined the walls of pits in thin-film samples using Auger electron spectroscopy [149]. The pit walls showed a large enhancement of... 

The structure of thin-film inductive recording heads results in the exposure to the environment of small areas of metal, often permalloy (Ni-20Fe), which is a relatively... 

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