Rapidly solidified (FePt)70P30 alloy with high coercivity

Abstract

Articles you may be interested inEffect of P to B concentration ratio on soft magnetic properties in FeSiBPCu nanocrystalline alloys Nanocrystalline Fe-Pt-B base hard magnets with high coercive force obtained from amorphous precursor J. Appl. Phys. 97, 10H308 (2005); 10.1063/1.1854252 High coercivity of melt-spun ( Fe 0.55 Pt 0.45 ) 78 Zr 2-4 B 18-20 nanocrystalline alloys with L1 0 structure

High coercivity FePt–C bulk magnet processed by spark plasma sintering and hot deformation

“…The hard magnetic properties achieved by the above processes are due to the formation of fine grains of the ordered L1 0 phase. Although a high coercivity of $ 20 kOe has been demonstrated in melt-spun Fe 35 Pt 35 P 30 ribbons, a large atomic fraction of the phosphor dilutes the ultimate magnetization of the magnet, resulting in a low energy product of 3-4 MGOe [8]. Similar is the case for mechanically milled and spark plasma sintered Fe-Pt-P magnets [7].…”

“…The FePt magnets in bulk form were reported to show low coercivity typically in the range 2-4.5 kOe and hence the applications are limited [5]. Enhancement of the coercivity has been reported in (i) FePt foils [6], (ii) spark plasma sintered Fe-Pt-P [7] and (iii) melt-spun Fe 35 Pt 35 P 30 ribbons [8]. The hard magnetic properties achieved by the above processes are due to the formation of fine grains of the ordered L1 0 phase.…”

Corrosion behaviour of FePt-based bulk magnets in artificial saliva solution

“…The details of alloy preparation as well as of microstructural and magnetic characterization are described elsewhere [4]. Besides pure Fe and Pt (Goodfellow) other commercial dental alloys have been tested as reference materials: the ferritic steel Fe-30Cr-0.18Ni-2Mo-0.15Si-0.04Mn corresponding to the stainless steel SUS447J1, the spring steel Fe-18Cr-18Mn-2Mo-1N (Scheu-Dental GmbH, Germany) and two CoCr-alloys, 63Co-28.5Cr-6Mo-0.4Si-1W-0.6Mn-0.5C (CoCr dental alloy 1, hard) and 65Co-27Cr-6Mo-0.4Si-1W-0.6Mn-0.1C (CoCr dental alloy 2, soft) (both AZ&Partner, Switzerland).…”

“…Such a thin film in combination with the high magnetization and a high energy product is of interest for applications in high density magnetic recording. Recent metallurgical approaches aim at incorporating grain boundaries (grain refinement) and nonmagnetic phases (alloying) as pinning sites to increase the coercivity in the bulk material [3,4]. High coercivities of 1400 kA/m (17.6 kOe) and 650 kA/m (8.2 kOe) were reported in bulk Fe 35 Pt 35 P 30 and Fe 50 Pt 50 magnets, respectively, that are processed by spark plasma sintering of mechanically milled powders.…”

Nanoscale precipitates and phase transformations in a rapidly-solidified Fe–Pt–B amorphous alloy

“…The good hard magnetic properties are interpreted to result from the exchange magnetic coupling between the nano-scale hard ␥ 1 tP4 FePt and soft magnetic ␥ cF4 Fe(Pt) solid solution as well as Fe 2 B phases [12]. Fe-Pt-P rapidly solidified alloys were also found to possess good magnetic properties [13].…”