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A process for the preparation of spherical NixCoyMn1−x−y(OH)2 precursors by combining reduction roasting, water leaching, acid leaching, and co-precipitation using spent LiNixCoyMn1−x−yO2 (NCM) as the recovery source is presented. According to the TG/DSC analyses, the spent NCM materials were reduced by carbon black at 650°C. The reduction products contain Li2CO3, Ni, Co, MnO, and NiO, which were...
In giant magnetocaloric effect (GMCE) materials a large entropy change couples to a magnetostructural first-order phase transition, potentially providing a basis for magnetic refrigeration cycles. However, hysteresis loss greatly reduces the availability of refrigeration work in such cycles. Here, we present a methodology combining a Preisach model for rate-independent hysteresis with a thermodynamic...
Patterned media (PM) for magnetic information storage have received increased attention in recent years as the primary candidate for 1 Terabit/in2 or higher recording density for computer hard disk drives. A PM consists of a periodic array of well-defined magnetic islands, each of which can store one bit of data. In the simplest scheme, the structures could be magnetic pillars and dots with a single...
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