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首页> 外文期刊>IEEE Transactions on Magnetics >High Perpendicular Magnetic Anisotropy of CoPtCr/Ru Films for Granular-Type Perpendicular Media
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High Perpendicular Magnetic Anisotropy of CoPtCr/Ru Films for Granular-Type Perpendicular Media

机译:High Perpendicular Magnetic Anisotropy of CoPtCr/Ru Films for Granular-Type Perpendicular Media

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摘要

The perpendicular magnetic anisotropy K_(u) of CoPtCr films deposited on Ru seed layers is discussed as a function of film composition. Moreover, the change in K_(u) by the addition of SiO_(2) is examined in light of thermal stability of CoPtCr-SiO_(2) media. The K_(u) of Co-10 at Cr shows a high value of ~5×10~(6) erg/cm~(3), which is much higher than that reported by Bolzoni et al. The addition of Pt to the Co-10 at Cr film results in a further enhancement of K_(u). A maximum K_(u) of nearly 10×10~(6) erg/cm~(3) is observed at 25~30 at Pt. All series of films with various Cr contents show maximum values of K_(u) at 25~30 at Pt. The maximum value for CoPt (Cr=0) films reaches ~15×10~(6) erg/cm~(3). The value of magnetocrystalline anisotropy of grains K_(u)~(g), calculated by taking account of the volume fraction of CoPtCr grains, decreases as the SiO_(2) content increases. However, the K_(u)~(g) maintains a large value of more than 7×10~(6) erg/cm~(3), even at 10 at SiO_(2) in addition to (Co_(90)Cr_(10))_(80)Pt_(20), which indicates a high potential of CoPtCr-SiO_(2) media to resist thermal agitation of magnetization.

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