Thermal behavior of the interlayer coupling in a spin-valve Co/Pt multilayer with perpendicular anisotropy

Thermal behavior of the interlayer coupling in a spin-valve Co/Pt multilayer with perpendicular anisotropy
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具有垂直各向异性的自旋阀 Co/Pt 多层膜中层间耦合的热行为

DOI:
10.1063/1.3033519
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发表时间:
2008-12
影响因子:
3.2
通讯作者:
柳忠元
柳忠元
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
柳忠元

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在具有垂直各向异性的自旋阀Co(4 μ m)/Pt(36 μ m)/[Co(4 μ m)/Pt(6 μ m)]2多层膜中,随着温度从300 K降低到20 K,我们的研究揭示了在接近80 K的温度下,通过Pt间隔层的层间耦合从反铁磁到铁磁的转变。在80 K以上,正的小回线位移随温度呈非单调变化,而在80 K以下,负的小回线位移随温度迅速减小,直到20 K时出现平方滞后主回线。这种观察到的不寻常的温度行为的层间耦合可以归因于在底部Co单层的磁化和Pt间隔物的极化随温度的热变化。
In the spin-valve Co(4 Å)/Pt(36 Å)/[Co(4 Å)/Pt(6 Å)]2 multilayer with perpendicular anisotropy, with the decrease in temperature from 300 to 20 K, our investigations have revealed one transition of the interlayer coupling from antiferromagnetic to ferromagnetic through the Pt spacer at the temperature close to 80 K. Above 80 K, the obtained positive minor-loop shift displays a nonmonotonic variation with temperature, while below 80 K, the obtained negative minor-loop shift demonstrates a fast decrease in magnitude with temperature until a square hysteresis major loop is observed at 20 K. This observed unusual temperature behavior of the interlayer coupling can be attributed to the thermal variations in the magnetization of the bottom Co single layer and the polarization of the Pt spacer with temperature.
DOI: 10.1103/physrevb.60.4082
发表时间: 1999-08
期刊: Physical Review B
影响因子: 3.7
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