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Gen 2 superlattice platinum-alloy media
Combating magnetic instability at the nanoscale
Seagate’s second‑generation superlattice platinum‑alloy media improves efficiency while maintaining — and in many cases increasing — areal density.
Highly stable magnetic nanoparticles, each acting as a single bit of data, can be packed closer together than in conventional PMR drives or earlier Mozaic™ generations. The result is greater data stability and stronger resistance to thermal fluctuations, enabling higher capacity without compromising reliability.
Within the superlattice platinum-alloy media, each nanoparticle, only a few nanometers in size, acts as an individual bit of data.
This fine granularity is made possible by the media’s high magnetic anisotropy — which means that the magnetic orientation of the material remains steady over time, ensuring that each bit is stable and unaltered by the writing of adjacent data.
This is key to stabilizing the magnetic state of individual bits, thereby reducing their susceptibility to thermal fluctuations.
Its high magnetic anisotropy provides the stability needed for recorded bits achieving record areal densities — bits that are placed together more densely than in any other hard drives in history.
Epitaxial growth is used to deposit FePt thin films on crystalline underlayers on a special glass substrate. These underlayers serve as a template, dictating the orientation and ordering of the FePt grains during the deposition process.
Subsequent annealing at high temperatures further promotes ordering in the FePt grains, leading to a phase transformation that enhances the media's magnetic properties and grain alignment.
