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Thermal agitation of magnetization in CoCrPt perpendicular recording media

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7 Author(s)
Shimatsu, T. ; Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan ; Uwazumi, H. ; Sakai, Y. ; Otsuki, A.
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Magnetic and structural properties of CoCrPt based perpendicular recording media required to achieve both high thermal stability and low-noise performance are discussed, based on experimental results obtained using a pulse magnetometer. Experimental and theoretical analysis reveal that for CoCrPt based media of 20 nm thickness having the thermal stability factor KuV/(kT)≈80, the maximum achievable value of the ratio of remanence coercivity to anisotropy field of grains, Hr/Hk, is ~0.35. Furthermore, if the strictest condition of demagnetizing factor, 4π, for perpendicular media is assumed, in order to realize a large squareness M r/Ms of nearly 1.0, which is required to resist the thermal agitation effect, we find that the value of perpendicular magnetocrystalline anisotropy, Ku, has to be more than 3 times larger than 2πMs2

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Magnetics, IEEE Transactions on  (Volume:37 ,  Issue: 4 )