Spin-current probe for phase transition in an insulator.
Spin-current probe for phase transition in an insulator.
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DOI：
10.1038/ncomms12670
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发表时间：
2016-08-30
影响因子：
16.6
通讯作者：
Saitoh, Eiji
中科院分区：
文献类型：
--
作者：
Qiu, Zhiyong;Li, Jia;Hou, Dazhi;Arenholz, Elke;N'Diaye, Alpha T.;Tan, Ali;Uchida, Ken-ichi;Sato, Koji;Okamoto, Satoshi;Tserkovnyak, Yaroslav;Qiu, Z. Q.;Saitoh, Eiji
自旋涨落和跃迁一直是磁学和凝聚态科学的中心课题之一。实验上，发现自旋波动被转录为中子散射过程中的散射强度，其由动态磁化率表示并在相变时最大化。重要的是，中子携带自旋而不带电荷，因此它可以将自旋带入样品而不受到电能的干扰。然而，需要核反应堆等大型设施。在这里，我们展示了经常用于纳米级自旋电子器件的自旋泵浦，为自旋跃迁提供了桌面微探针；自旋电流是不带电荷的自旋通量，其传输反映了自旋激发。我们展示了通过频率相关的自旋电流传输测量来检测超薄 CoO 薄膜中的反铁磁转变，这为微小器件中以电方式进行相变提供了多功能探针。 虽然中子散射是研究材料自旋波动的强大工具，但其可用性仅限于大型用户设施。在这里，作者演示了如何将纯自旋电流的泵浦用作桌面探针来检测反铁磁转变。
Spin fluctuation and transition have always been one of the central topics of magnetism and condensed matter science. Experimentally, the spin fluctuation is found transcribed onto scattering intensity in the neutron-scattering process, which is represented by dynamical magnetic susceptibility and maximized at phase transitions. Importantly, a neutron carries spin without electric charge, and therefore it can bring spin into a sample without being disturbed by electric energy. However, large facilities such as a nuclear reactor are necessary. Here we show that spin pumping, frequently used in nanoscale spintronic devices, provides a desktop microprobe for spin transition; spin current is a flux of spin without an electric charge and its transport reflects spin excitation. We demonstrate detection of antiferromagnetic transition in ultra-thin CoO films via frequency-dependent spin-current transmission measurements, which provides a versatile probe for phase transition in an electric manner in minute devices. Whilst neutron scattering is a powerful tool for studying spin fluctuations in materials, its availability is limited to large-scale user facilities. Here, the authors demonstrate how the pumping of pure spin currents can be used as a desktop probe to detect an antiferromagnetic transition.
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影响因子：
3.2
作者：
Azevedo, A;Leao, LHV;Rezende, SM
通讯作者：
Rezende, SM
影响因子：
3.7
作者：
Alders, D;Tjeng, LH;Iacobucci, S
通讯作者：
Iacobucci, S
影响因子：
3.7
作者：
Bender, Scott A.;Tserkovnyak, Yaroslav
通讯作者：
Tserkovnyak, Yaroslav
影响因子：
4
作者：
Saitoh, E;Ueda, M;Tatara, G
通讯作者：
Tatara, G
影响因子：
8.6
作者：
Li, J.;Tan, A.;Qiu, Z. Q.
通讯作者：
Qiu, Z. Q.