Magnetic alloys

Au-Ni and Cu-Ni-Au alloys Magnetic hyperfine spitting at Au, // and isomer shift as function of composition, model to describe charge density distribution... 

Deposition and patterning of the bottom magnetic pole follow. The pole is usually electroplated with a through-photoresist window frame mask to a thickness level of 2 to 4 fim. Note that whereas the magnetic pole is made into a pancake shape to increase the head efficiency, it is the narrow p>ole tip s dimension that determines the narrow track width. As stated, the widely used Co-based alloy magnetic poles are elec-trodeposited (wet process). Nanocrystalline FeN-based alloys are sputter-deposited in a vacuum chamber (dry process). 

Aluminum alloy - [MAGNETIC MATERIALS - THIN FILMS AND PARTICLES] (Vol 15) -cerium m [CERIUM AND CERIUM COMPOUNDS] (Vol 5) -electroless plating of [ELECTROLESS PLATING] (Vol 9) -standards and specification [MATERIALS STANDARDS AND SPECIFICATIONS] (Vol 16) -use m sulfuric acid manufacture [SULFURIC ACID AND SULFURTRIOXIDE] (Vol 23)... 

Australian manufacturer Innovadent produces Nd-Fe-B alloy magnets of two sizes namely mini magnet (case size of 3 x 3 x 4 mm3) providing 500 grams of retention and Maxi magnet(case size 4 x 4.5 x 6.5 mm3) with about 1000 grams of retention. 

The name comes from gadolinite, the mineral from which the trace element was first found. It was identified in 1880 by both Jean Charles Galissard de Marignac (1817-1984) and Frangois Lecoq de Boisbaudran (1838-1912) and is part of the complex yttria group. The whitish-silver metal has been used in compound form in specialty alloys, magnets, and phosphors in color television. 

Fiepke, 1990 Leroux et al., 1991 Watanabe, 1991). However, CoPt alloy magnets are seldom used now since these alloys have been replaced by the rare earth magnets with superior magnetic properties. 

Table 33.9 compares some of the important properties of hard ferrites with hard metal alloy magnets such as alnico and high-energy (BH > 80kJ/m ) rare earth magnets such SmCos. 

Fig. 95. Alloy magnetic phase diagram (deduced from (iSR measiuements) of BijSrjfCajYlCujQ-g and Bi2Sr2(Nd,Ce)Cu20. (De Renzi et al. 1990).

Platinum and Platinum Alloys Applications. Platinum and platinum alloys are important constituents of catalysts (chemistry, automotive exhaust gas cleaning, fuel cells), sensor materials (thermocouples, resistance thermometers), strong permanent magnet alloys, magnetic and magnetooptical (memory) devices, high temperature and corrosion resistant stmctural parts, and electrical contacts and connecting elements. Classical applications are jewelry and dentistry alloys. 

Table i. .3-2 Standard lEC specification for non-alloyed magnetic steel sheet. The conventional designation of the different grades (first column) comprises the following order (1) 100 times the maximum specified loss (Wkg ) at 1.5T (2) 100 times the nominal sheet thickness in (mm) (3) the characteristic letter D (4) one tenth of the frequency in Hz at which the magnetic properties are specified. The materials are delivered in the semi-processed state. The magnetic properties apply to test specimens heat-treated according to manufacturer s specifications... 

Table 4.3-24 shows the magnetic and physical properties of some commercially-available nanocrystalline alloys for conqtarison to amorphous and Ni—Fe-based crystalline soft magnetic alloys. Magnetic field annealing allows the shape of the hysteresis loops of... 

Drawn in the following figure is a proposed lattice for one of the Alnico alloys, magnetic alloys composed of nickel (A) cobalt (B), and aluminum (C). 

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