Thermal stability in magneto-optical recording media: analysis of magnetization decay

Rachid Sbiaa; Mitsunori Mochida; Yusuki Itoh; Takao Suzuki

doi:10.1117/12.416811

7 February 2001 Thermal stability in magneto-optical recording media: analysis of magnetization decay

Rachid Sbiaa, Mitsunori Mochida, Yusuki Itoh, Takao Suzuki

Proceedings Volume 4085, Fifth International Symposium on Optical Storage (ISOS 2000); (2001) https://doi.org/10.1117/12.416811
Event: Fifth International Symposium on Optical Storage (IS0S 2000), 2000, Shanghai, China

Abstract

Thermal stability of amorphous TbFeCo monolayers 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 has been investigated. The non-linear evolution of magnetization with ln(time) happens 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 easily by a single energy barrier E_B model. As Pt thickness increases, distribution of E_B becomes wider leading to almost linear magnetization decay with ln(time) as in longitudinal recording media. The activation volume is determined for these media and shows a strong correlation with reversing field, thus yielding variations of stability over a written bit.

Citation Download Citation

Rachid Sbiaa, Mitsunori Mochida, Yusuki Itoh, and Takao Suzuki "Thermal stability in magneto-optical recording media: analysis of magnetization decay", Proc. SPIE 4085, Fifth International Symposium on Optical Storage (ISOS 2000), (7 February 2001); https://doi.org/10.1117/12.416811

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