Sm–Co films for high-density magnetic recording media

Influence of multilayer modulation on structural and magnetic features in the Pt/Sm–Co system

“…However, the limited magnetic content (due to the ultrathin-film character) does not allow for a significant coercivity increase and an actual magnetic hardening of the magnetic phase. Moreover, the slight kinks observed in the multilayer hysteresis loop may be correlated with the existence of a second softer magnetic phase due to Sm oxidation leading to Co-rich film, in agreement with relevant works [2,20].…”

“…The relatively enhanced magnetization (compared to the bulk value for SmCo 5 $800 emu/cm 3 [2,12]) provides an indirect evidence of the better crystallization of the Sm-Co layer due to the existence of multiple Pt underlayers. However, the limited magnetic content (due to the ultrathin-film character) does not allow for a significant coercivity increase and an actual magnetic hardening of the magnetic phase.…”

“…Sm-Co phases are among the favorite magnetic materials for high-temperature applications, where strong and localized magnetic fields are needed since they exhibit high Curie temperatures ($800 1C) and huge magnetocrystalline anisotropy [1][2][3]. More specifically, nanoscale research areas like the reduction of the critical grain size for magnetic recording to withstand the superparamagnetic limit and the quest of enhanced energy products via exchange coupling are perfectly matching with the well-defined geometry of Sm-Co bilayers, trilayers, multilayers [4], and more recently nanoparticles [5].…”

A new TiW seed layer for SmCo5 films with perpendicular magnetic anisotropy

“…The Cu underlayer surface with a large Cu grain will induce SmCo 5 film with a larger grain and a rougher surface and deteriorate the magnetic properties of SmCo 5 film [11]. The changes of the grain sizes and the surface roughness of Cu films deposited on the TiW seed layers with 0, 5, 10, 30 nm thickness are shown in Fig.…”

The effects of tungsten concentration on crystalline structure and perpendicular magnetic anisotropy of Co-W films

“…[1][2][3] Hexagonal-close-packed (hcp)-Co-based alloy is always a research focus material for high-density magnetic recording media. [4][5][6] Especially, the introduction of 5d transition elements has great effect on the MAE of hcp-Co. 7,8 Due to the spin orbit coupling and strong 3d-5d hybridization between 3d and 5d elements, it is expected that 5d transition elements significantly influence the MAE of ferromagnetic 3d metals. [9][10][11][12] According to systematic studies on the MAE of Co-based hcp alloy thin films, the MAE of Co-W, 8 CoMo 13 and Co-Pt 14 films is larger than that of Co-Cr films.…”