Reduction of grain size and exchange coupling strength of Nd2Fe14B thin films by Al addition

G., Y.; Zheng, Yuying; Wei, Fulin; Matsumoto, M.; Morisako, Akimitsu; Takei, S.

doi:10.1002/pssa.200306820

Cited by 1 publication

(3 citation statements)

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“…87 In order to further decrease the magnetic grain size and also exchange coupling, the addition of aluminium is an effective way, decreasing grain size down to y10 nm. 89 …”

Section: Thermal Stability Improvementmentioning

confidence: 99%

“…Rare earth compounds, proposed as future recording media, have been paid relatively little attention up to now, [84][85][86][87][88][89] possibly owing to their much high magnetic anisotropy (for example, Fe 14 Nd 2 B, 4?6610 7 erg cm 23 ; SmCo 5 , 1?1610 8 -2610 8 erg cm 23 ) 11 and their poor oxidation resistance as well as their poor crystallisation at common sputtering conditions. Generally speaking, higher magnetic anisotropy of media allows smaller magnetic grains to be against the thermal energy, and thus benefit higher theoretical areal density.…”

Section: Thermal Stability Improvementmentioning

confidence: 99%

“…Even so, there have been some interesting results on this topic. [84][85][86][87][88][89] SmCo 5 was initially suggested to be a longitudinal medium and the proper Cr underlayer induced in-plane easy axis, but with a small coercivity of ,2 kOe. 84 Sayama et al later found that the suitable underlayer Cu can induce very perfect perpendicular anisotropy and Ti seeding layer further increases out-of-plane coercivity as high as 12 kOe and decreases minimal stable magnetic grain size as small as y4 nm.…”

Section: Thermal Stability Improvementmentioning

confidence: 99%

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Development of high density magnetic recording media for hard disk drives: materials science issues and challenges

Gan¹,

Ren²,

Xiao³

et al. 2009

International Materials Reviews

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The tremendous increase in areal density of hard disk drives is mainly ascribed to harmonic development between magnetic recording media and heads in their scaling, especially allowing a commercial transition from the longitudinal to perpendicular recording system. This paper reviews the main features, recent breakthroughs and future potentials of both the longitudinal and the perpendicular media from a viewpoint of materials science. Special attention is firstly paid to the 'trilemma' problem for the media, i.e. the compromise among writability, thermal stability and signal to noise ratio (SNR). The evolution of media materials these years are then addressed with emphasis on the thermodynamic origin of magnetically induced phase separation of Co-Cr based alloys, which governs media noise and coercivity, and its applications to the current longitudinal media. The materials challenges for media to achieve 500 Gb in. 22 and above are further predicted from the viewpoints of thermal stability improvement and microstructure control of media materials, and their engineering issues have been discussed for the current Co-Cr based alloys, potential FePt and CoPt ordered, phase separated Co-W based alloys and magnetic rare earth compounds. Finally, the future media approaching 1 Tb in. 22 and beyond are addressed with respect to the principles, progress, engineering challenges and future directions.

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“…87 In order to further decrease the magnetic grain size and also exchange coupling, the addition of aluminium is an effective way, decreasing grain size down to y10 nm. 89 …”

Section: Thermal Stability Improvementmentioning

confidence: 99%