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首页> 外文会议>NATO Advanced Study Institute on Magnetic Storage Systems Beyond 2000, Jun 25-Jul 7, 2000, Rhodes, Greece >HIGH SPEED SWITCHING IN RECORDING MEDIA
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HIGH SPEED SWITCHING IN RECORDING MEDIA

机译：记录媒体的高速切换

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摘要

The natural precessional response of the magnetization to an applied field has always complicated the high frequency switching process in magnetic devices. Until recently, magnetic recording, which has dominated on-line and archival storage, could be treated quasi-statically. However, as linear densities approach 500 Kbits/in at disk rotation speeds exceeding 10,000 RPM, recording must occur in ～10~(-9) s, the regime where precessional effects become important. At the same time, to achieve these extraordinary linear densities, grain size in media has been reduced to <10 nm with processing optimized to reduce exchange coupling between grains. The result is significantly increased thermal instability, reducing the remanent coercivity which at 10~(-9) s is ～4000-5000 Oe to values below 2500 Oe at long times (10~9 s), thus threatening archivability. This requires that the time dependent properties be addressed over > 18 orders of magnitude! Here, the experimental data on the time-dependent remanent coercivity H_(CR)(τ) in state-of-the-art media is presented and related to their basic properties. In all cases, H_(CR)(τ) is well described by a generic form of Sharrock's Law, at least down to 10~(-9)s. Below 10~(-9)s, precessional effects increase H_(CR)(τ) more rapidly but the product of the field increment relative to H_(CR)(τ) at 10~(-9)s and the field pulse width is only ～ 100 - 400 Oe-ns. Therefore, existing high moment record head and media materials should be adequate up to several GHz.
机译：磁化对施加磁场的自然进动响应始终使磁性设备中的高频开关过程变得复杂。直到最近，在在线存储和档案存储中占主导地位的磁记录仍可以进行准静态处理。然而，当磁盘转速超过10,000 RPM时线性密度接近500 Kbits / in时，记录必须在〜10〜（-9）s内发生，而进动影响在其中变得尤为重要。同时，为了实现这些非凡的线性密度，通过优化处理以减少晶粒之间的交换耦合，介质中的晶粒尺寸已减小至<10 nm。结果是大大增加了热不稳定性，长时间（10〜9 s）时在10〜（-9）s〜4000-5000 Oe的剩余矫顽力降低到2500 Oe以下的值，从而威胁了归档性。这就要求与时间相关的属性必须大于18个数量级！在此，介绍了有关最新技术介质中随时间变化的剩余矫顽力H_（CR）（τ）的实验数据，并与它们的基本特性有关。在所有情况下，H_（CR）（τ）都可以用通用的Sharrock定律来描述，至少可以低至10〜（-9）s。在10〜（-9）s以下，进动效应使H_（CR）（τ）更快地增加，但是在10〜（-9）s处相对于H_（CR）（τ）的场增量与场脉冲宽度的乘积仅为〜100-400 Oe-ns。因此，现有的高力矩记录头和媒体材料在几GHz以下应足够。

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