Thermal stability and the magnetization process in CoCrPt–SiO2 perpendicular recording media

Tailoring the growth of L10‐FePt for spintronics applications

“…It is also interesting to note that the hysteresis loops show two reversals; a faster one after nucleation and a slower one near/after the coercive point. Such an observation has been reported in CoCrPt:SiO 2 media with a significantly large exchange coupling 15. It has been reported that the faster reversal around nucleation field happens due to the reversal of magnetization in certain regions, which results in reduced magnetostatic energy.…”

Intermediate layer thickness dependence on switching field distribution in perpendicular recording media

“…The c-axis dispersion increases further when the Ta thickness is reduced from 5 nm for sample C to 2.5 nm for sample D. A significant increase in the c-axis dispersion (11) accompanied by a reduction in H c and H n was observed. These results are understandable, as earlier studies have pointed out that the seedlayers below the intermediate layers and their thickness are critical in ensuring good growth of the Ru layer, as well the recording layer [16]. The decrease of H c and H n are significant when the thickness of the RuCr layer is reduced from 5 to 2.5 nm.…”

“…4 and 5 that sample A with the highest IL thickness has the largest SFD The nucleation field for these samples is higher than 1 kOe, resulting in thermally stable recording media. It is expected in these samples that the exchange coupling between the grains could increase as the IL thickness is reduced [16]. The magnitude of exchange coupling can be expressed by the coefficient S, which is related to the slope of the hysteresis loop at coercivity.…”

Thickness dependence of magnetic properties in La–Co substituted strontium hexaferrite films with perpendicular anisotropy

“…5 to study the reversal mechanism. Based on the three stage reversal process of Stoner-Wohlfarth coherent reversal mechanism, the grains in films with strong perpendicular texture undergo a switching process corresponding to Stoner-Wohlfarth rotation along the hard-axis, and exhibit a largely reversible hysteresis [17,18]. As depicted, the initial magnetization curves for the films at t¼85-110 nm upward convex and rise at the low magnetic field, demonstrating a characteristic of nucleation model [19,20].…”