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arXiv 1802.05375cond-mat.mes-hall
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高温超快退磁

Ultrafast demagnetization at high temperatures

F. Hoveyda, E. Hohenstein, R. Judge, S. Smadici

摘要:

在Co/Pd超晶格中进行了可变热积累下的时间分辨泵浦-探测测量。热积累增加了基线温度,降低了平衡磁化强度。瞬态超快退磁首先与强平衡热自旋涨落并行地以较高的注量发展。然后,随着平衡温度接近居里温度,超快退磁被逐渐去除。瞬态磁化强度随时间的变化与自旋翻转散射模型吻合较好。

英文摘要:

Time-resolved pump-probe measurements were made at variable heat accumulation in Co/Pd superlattices. Heat accumulation increases the baseline temperature and decreases the equilibrium magnetization. Transient ultrafast demagnetization first develops with higher fluence in parallel with strong equilibrium thermal spin fluctuations. The ultrafast demagnetization is then gradually removed as the equilibrium temperature approaches the Curie temperature. The transient magnetization time-dependence is fit well with the spin-flip scattering model.

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