The magnetic properties of thin-film Pd/Fe/Pd trilayers in which an embedded ~1.5 A-thick ultrathin layer of Fe induces ferromagnetism in the surrounding Pd have been investigated. The thickness of the ferromagnetic trilayer is controlled by varying the thickness of the top Pd layer over a range from 8 A to 56 A. As the thickness of the top Pd layer decreases, or equivalently as the embedded Fe layer moves closer to the top surface, the saturated magnetization normalized to area and the Curie temperature decrease whereas the coercivity increases. These thickness-dependent observations for proximity-polarized thin-film Pd are qualitatively consistent with finite size effects that are well known for regular thin-film ferromagnets. The critical exponent $β$ of the order parameter (magnetization) is found to approach the mean field value of 0.5 as the thickness of the top Pd layer increases. The functional forms for the thickness dependences, which are strongly modified by the nonuniform exchange interaction in the polarized Pd, provide important new insights to understanding nanomagnetism in two-dimensions.
Temperature- and Bias-dependence of magnetoresistance in doped manganite thin film trilayer junctions
La $%_{0.67}$ Sr $_{0.33}$ MnO的薄膜三层结$_3$ - SrTiO $_3$ - La $_{0.67}$ Sr $_{0.33}$ MnO $_3$在14 K下在100 Oe左右的磁场中显示出9.7倍的电阻变化。结的磁电阻是偏置和温度相关的。与偏压和温度依赖性相关的能量尺度是一个数量级。同一组能量也决定了结的微分电导的偏置和温度依赖性。我们讨论了这些结果在结势垒界面的金属簇夹杂物。
How experimentally to detect a solitary superconductivity in dirty ferromagnet-superconductor trilayers?
本文从理论上研究了F $_1$ F $_2$ S设计中铁磁（F）-超导（S）异质结构中的邻近效应。本文考虑了Usadel型方程在所谓的“脏”极限情形下的边值问题。考虑了F层中的“潜在”超导对相互作用。重点是在实验制备的所谓的孤立超导态的配方。我们还提出并讨论了孤立超导区基于F $_1$ F $_2$ S三层的超导自旋阀模型。
Large spin pumping effect in antisymmetric precession of Ni$_{79}$Fe$_{21}$/Ru/Ni$_{79}$Fe$_{21}$
在磁性三层结构中，对铁磁共振的吉尔伯特阻尼的贡献来自于从一层泵送到另一层的自旋电流。这种贡献已被证明为层与弱耦合，分离的共振，其中磁化动力学激发主要在一个层和其他层作为自旋阱。在这里，我们表明，三层结构中的磁化被同时激发，反对称，显示自旋泵效应约两倍大。反铁磁耦合的Ni $_{79}$ Fe $_{21}$（8 nm）/Ru/Ni $_{79}$ Fe $_{21}$（8 nm）三层膜的反对称（光学）模式显示出比对称（声学）模式大的吉尔伯特阻尼常数，其量与Py（$Δα\simeq\textrm{0.006}$）的本征阻尼一样大。在3-25 GHz范围内，场垂直和场平行于膜平面几何形状的效果是相同的。结果证实了自旋泵模型的预测，并在GHz的设备中使用的合成反铁磁体（SAF）的结构的影响。
Study of spin pumping in Co thin film vis-a-vis seed and capping layer using ferromagnetic resonance spectroscopy
We investigated the dependence of the seed [Ta/Pt, Ta/Au] and capping [Pt/Ta, Au/Ta] layers on spin pumping effect in the ferromagnetic 3 nm thick Co thin film using ferromagnetic resonance spectroscopy. The data is fitted with Kittel equation to evaluate damping constant and g-factor. A strong dependence of seed and capping layers on spin pumping has been discussed. The value of damping constant {alpha} is found to be relatively large i.e. 0.0326 for the Ta{3}/Pt{3}/Co{3}/Pt{3}/Ta{3} {nm} multi-layer structure, while it is 0.0104 for Ta{3}/Co{3}/Ta{3} {nm}. Increase in {alpha} is observed due…
Experimental observation of spin to charge current conversion at non-magnetic metal/Bi2O3 interfaces
在这里，我们展示了界面的自旋电荷电流转换的自旋泵从铁磁坡莫合金（Py：Ni 80 Fe 20）的Cu/Bi 2 O 3界面。在Py/Cu/Bi_2O_3三层膜的电压谱中观察到一个明显的自旋-电荷电流转换信号，而在Py/Cu和Py/Bi_2O_3双层膜中没有这种信号.我们还发现，转换系数强烈依赖于铜层的厚度，反映了厚度依赖的动量弛豫时间在铜层。
Ultrafast carrier dynamics in thin-films of the topological insulator Bi2Se3
瞬态反射率测量的薄膜，从6到40 nm的厚度范围内，的拓扑绝缘体Bi 2 Se 3的载流子弛豫时间上的膜厚度显示出很强的依赖性。对于较厚的膜，弛豫动力学与体相Bi2Se3的弛豫动力学相似，其中体绝缘相的贡献大于表面金属相的贡献。载流子弛豫时间随着膜厚度的减小而缩短，达到与贵金属相当的值。这种效应可能是由于狄拉克锥态在相对表面的最薄的膜的杂交。
