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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 >THERMAL STABILITY IN MAGNETIC AND MAGNETO-OPTICAL RECORDING MEDIA
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THERMAL STABILITY IN MAGNETIC AND MAGNETO-OPTICAL RECORDING MEDIA

机译：磁和磁光记录介质中的热稳定性

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First, a brief review of thermal decay of magnetization is given. Discussions on activation volume are presented in detail for longitudinal recording media. It is noted that the activation volume estimated based on waiting time methods is found to decrease with increasing reversing field for all the media under consideration. This result suggests that an activation volume in a written bit changes from place to place, depending upon on stray field due to a bit-transition. The recording noise is closely related to activation volume as well. Thermal stability of amorphous TbFeCo mono-layers and {TbFeCo/Pt} multilayers is studied by magnetic viscosity measurements M(t). Using, isothermal remanence measurements the relationship between the magnetization reversal process and its time dependence is investigated. The non-linear evolution of magnetization with In(time) takes place when the mechanism responsible for magnetization reversal process is mainly domain nucleation. On the other hand domain wall motion process induces a linear M(t) behavior. For multilayers with very small Pt thickness (samples with high square hysteresis loop), magnetization time decay can be described by a single energy barrier E_B model. As Pt thickness increases, the distribution of E_B becomes wider leading to almost linear magnetization decay with In(time) as in longitudinal recording media. Finally, the life time of written domains is discussed in terms of domain size. It is concluded that the difference between a pinning field and wall-field is a decisive factor for governing a life time.
机译：首先，简要回顾了磁化的热衰减。对于纵向记录介质，详细讨论了激活量。注意，发现对于所有正在考虑的介质，根据等待时间方法估算的激活量会随着反向场的增加而减小。该结果表明，写入位中的激活量随位而变化，这取决于由于位转换而引起的杂散场。录音噪音也与激活音量密切相关。通过磁粘度测量值M（t）研究了非晶态TbFeCo单层和{TbFeCo / Pt}多层的热稳定性。利用等温剩磁测量，研究了磁化反转过程与其时间相关性之间的关系。当负责磁化反转过程的机理主要是磁畴成核时，会发生In（时间）引起的磁化非线性演化。另一方面，畴壁运动过程引起线性M（t）行为。对于Pt厚度非常小的多层（具有高方形磁滞回线的样品），磁化时间衰减可以通过单个能垒E_B模型来描述。随着Pt厚度的增加，E_B的分布会变宽，导致纵向记录介质中In（time）几乎呈线性磁化衰减。最后，根据域大小讨论了书面域的生存时间。结论是，钉扎场和壁场之间的差异是决定寿命的决定性因素。

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