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Magnetic properties and corrosion inhibition properties of hybrid magnetic overcoats (Hy-MOC) that are suitable for ultra-high-density recording are investigated. Two types of Hy-MOC using different types of Co-based alloys were investigated for the magnetic overcoat (MOC). Hy- MOC(??) used CoCrPt:SiO<sub>2</sub> (14% SiO<sub>2</sub>) while Hy-MOC(...
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... analysis was carried out to verify that nitrides species are formed in both MOC and MOC . The typical fitted XPS results shown in Fig. 3 show that the nitrides of Si [shown in Si 2s spectrum in Fig showing peaks of SiO at 532.0 eV and Cr oxides at 531.0 eV. It is also observed in the fitted N 1s spectrum that there is peak at 400.3 eV which is attributed to X-N where X may be H, O, or adsorbed N ...
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... was also confirmed by the XPS analysis that there is a pres- ence of Cr nitrides and Cr in MOC . It was observed from the fitted Cr peak in Fig. 3(e) that there are both elemental Cr and Cr nitrides, with binding energies at 574.3 eV and 575.6 eV, respectively. This presence of Cr nitrides is confirmed by the N 1s spectrum (in Fig. 3(f)), which also further indicates the pres- ence of both CrN at 397.5 eV and Cr N at 398.5 ...
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... was also confirmed by the XPS analysis that there is a pres- ence of Cr nitrides and Cr in MOC . It was observed from the fitted Cr peak in Fig. 3(e) that there are both elemental Cr and Cr nitrides, with binding energies at 574.3 eV and 575.6 eV, respectively. This presence of Cr nitrides is confirmed by the N 1s spectrum (in Fig. 3(f)), which also further indicates the pres- ence of both CrN at 397.5 eV and Cr N at 398.5 ...
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Citations
... From the research, it was concluded that Hy-MOC(β) hard disk media has weaker magnetic properties than the Hy-MOC(∝), but Hy-MOC(β) is more corrosive resistant. The magnetic media can be protected by a new Hy-MOC system and also provides thermal stability [52]. ...
... Schematic diagram of electrochemical setup used for the investigation[52]. ...
Light metal alloys are extensively used in automotive, aerospace, aircraft, and military sectors since their lightweight leads to reduced energy consumption, increased fuel efficiency, and better environmental protection. In the present situation, nanomaterials are the potential candidate for weight saving in the structural application and can meet stringent government norms. Nanomaterial was heat-treated in the furnace to about a certain temperature and time and then normalized for strengthening. The heat-treated nanomaterial undergoes different forging processes, namely, hot forging and cold forging, using a certain capacity’s hydraulic press. Hence, in this work, an extensive study on the influence of the prestrain annealing, the corrosion rate on differently treated samples, and the effect of sensitization heat treatment on the nanomaterial was done.
... It has a high magnetic moment of 1150 emu/cc, comparable to CoCrPt-based alloys currently used. 2 We have used the phenomenon of exchange bias where a ferromagnetic (F) layer is grown in intimate contact with an antiferromagnetic (AF) layer such that the two layers are exchange coupled. This system, when heated in the presence of a field which saturates the F layer, results in a unidirectional anisotropy being induced in the F layer. 3 The hysteresis loop is then shifted so that both coercivities can lie in negative fields. ...
In this work, we describe an alternative strategy for the development of heat assisted magnetic recording media. In our approach, the need for a storage material with a temperature dependent anisotropy and to provide a read out signal is separated so that each function can be optimised independently. This is achieved by the use of an exchange bias structure where a conventional CoCrPt-SiO2 recording layer is exchange biased to an underlayer of IrMn such that heating and cooling in the exchange field from the recording layer results in a shifted loop. This strategy requires the reorientation of the IrMn layer to allow coupling to the recording layer. This has been achieved by the use of an ultrathin (0.8 nm) layer of Co deposited beneath the IrMn layer. In this system, the information is in effect stored in the antiferromagnetic layer, and hence, there is no demagnetising field generated by the stored bits. A loop shift of 688 Oe has been achieved where both values of coercivity lie to one side of the origin and the information cannot be erased by a magnetic field.
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