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- W2061579032 abstract "A class of nanocrystalline alloys, HITPERM (Fe, Co)–M–B–Cu (M=Zr,Hf,Nb, etc.) found to exhibit excellent soft-magnetic properties is being studied for use as a soft-magnetic underlayer for perpendicular recording media. Previously, we reported that HITPERM films of ∼100 nm thickness sputtered at room temperature (RT) and at ∼2.3 W/cm2 power density had exhibited an amorphous microstructure, which had turned mixed nanocrystalline when prepared at ∼250 °C. However, nanoparticles of FeCo have now been crystallized even at RT without the application of heat, by increasing the sputtering power density to ∼4.5 W/cm2. This dramatically improved the 4πMs while still maintaining a low coercivity. There was a further slight increase in the 4πMs at ∼6.8 W/cm2. Moreover, these soft-magnetic properties were maintained even when the substrate temperature was subsequently raised to ∼250 °C. Transmission electron microscopy studies showed the presence of relatively small nanocrystals of the ferromagnetic α′-FeCo (or α-FeCo) phase alone, for both sets of films. Previously, we had reported that the CoCrPt magnetic layer grew with a strong (00⋅2) texture on amorphous HITPERM. We have now seen that with a thin Ti intermediate layer (∼5 nm) the CoCrPt layer maintained a strong (00⋅2) texture even on the nanocrystalline HITPERM. Thus, due to their particular nanocrystalline nature, these HITPERM films exhibit much better soft-magnetic properties, while still leading to strong (00⋅2) texture on the CoCrPt magnetic layer." @default.
- W2061579032 created "2016-06-24" @default.
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- W2061579032 date "2003-05-09" @default.
- W2061579032 modified "2023-09-26" @default.
- W2061579032 title "HITPERM soft-magnetic underlayers for perpendicular thin film media" @default.
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- W2061579032 doi "https://doi.org/10.1063/1.1558091" @default.
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