磁記錄材料ppt課件-文庫吧資料
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【正文】 main wall High Hk Low Hk Hexc . Victora, IEEE Trans. Magn. 41, 537 (2022)。 ? 日立公司表示，他們 2022年 4月實(shí)現(xiàn) 230 Gbit/in2， 2022年 9月實(shí)現(xiàn) 345 Gbit/in2， 2022年 08月 04日 他們創(chuàng)造了垂直磁記錄密度的新紀(jì)錄，達(dá)到了 610Gbit/in2。 STT (Spin torque transfer) – RAM. Areal Density Growth 0 . 11101001000100001000001989 1991 1993 1995 1997 1999 2022 2022 2022 2022 2022 2022 2022 2022 2022 2022y e a rgigabit / in2Single particle superparamagic limit (estimated) Charap’s limit (broken) – Late 1990s – super paramagic limit demonstrated through modeling – Longitudinal recording reaching areal density limits – Longitudinal antiferromagic recording (AFC) – Perpendicular expected to extend to Tb/in2 – Additional innovations required at that point ? heatassisted recording (HAMR) ? bit patterned media (BPM) recording ? Areal Density CAGR 40% ? Transfer Rate CAGR 20% Perpendicular HAMR HAMR+BPM 00 . 0 50 . 10 . 1 50 . 20 . 2 50 5 10 15 20 25 30 35g r a i n s i z e (n m )normalized frequency2 4 G b i t / i n21 0 n m m e a n s i z e1 6 G b i t / i n21 1 n m m e a n s i z e1 0 G b i t / i n21 2 n m m e a n s i z e6 G b i t / i n21 5 n m m e a n s i z e1 0 0 G b i t / i n29 . 1 n m m e a n s i z eSt d . D e v . 1 . 7 n m4 5 G b i t / i n29 n m m e a n s i z eSt d . D e v . 2 . 2 n m20nmPhysical grain size below 10 nm Magic Media Evolution 19551985: ?Fe2O3 particles were dispersed in a polymer blinder and spincoated on substrates of AlMg with an anodized aluminum oxide layer. Thin film disk technology started after 1985. To preserve SNR, number of grains in a bit must be constant. SNR~log10(N) Therefore higher densities require smaller grains The smaller bits have a higher probability of flipping and
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